Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / ndp / clr / src / BCL / System / IO / File.cs / 1 / File.cs
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
/*============================================================
**
** Class: File
**
**
** Purpose: A collection of methods for manipulating Files.
**
** April 09,2000 (some design refactorization)
**
===========================================================*/
using System;
using System.Security.Permissions;
using PermissionSet = System.Security.PermissionSet;
using Win32Native = Microsoft.Win32.Win32Native;
using System.Runtime.InteropServices;
using System.Security;
#if !FEATURE_PAL
using System.Security.AccessControl;
#endif
using System.Text;
using Microsoft.Win32.SafeHandles;
using System.Collections;
using System.Globalization;
using System.Runtime.Versioning;
namespace System.IO {
// Class for creating FileStream objects, and some basic file management
// routines such as Delete, etc.
[ComVisible(true)]
public static class File
{
private const int GetFileExInfoStandard = 0;
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static StreamReader OpenText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
return new StreamReader(path);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static StreamWriter CreateText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
return new StreamWriter(path,false);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static StreamWriter AppendText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
return new StreamWriter(path,true);
}
// Copies an existing file to a new file. An exception is raised if the
// destination file already exists. Use the
// Copy(String, String, boolean) method to allow
// overwriting an existing file.
//
// The caller must have certain FileIOPermissions. The caller must have
// Read permission to sourceFileName and Create
// and Write permissions to destFileName.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Copy(String sourceFileName, String destFileName) {
Copy(sourceFileName, destFileName, false);
}
// Copies an existing file to a new file. If overwrite is
// false, then an IOException is thrown if the destination file
// already exists. If overwrite is true, the file is
// overwritten.
//
// The caller must have certain FileIOPermissions. The caller must have
// Read permission to sourceFileName
// and Write permissions to destFileName.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Copy(String sourceFileName, String destFileName, bool overwrite) {
InternalCopy(sourceFileName, destFileName,overwrite);
}
///
/// Note: This returns the fully qualified name of the destination file.
///
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
internal static String InternalCopy(String sourceFileName, String destFileName, bool overwrite) {
if (sourceFileName==null || destFileName==null)
throw new ArgumentNullException((sourceFileName==null ? "sourceFileName" : "destFileName"), Environment.GetResourceString("ArgumentNull_FileName"));
if (sourceFileName.Length==0 || destFileName.Length==0)
throw new ArgumentException(Environment.GetResourceString("Argument_EmptyFileName"), (sourceFileName.Length==0 ? "sourceFileName" : "destFileName"));
String fullSourceFileName = Path.GetFullPathInternal(sourceFileName);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullSourceFileName }, false, false ).Demand();
String fullDestFileName = Path.GetFullPathInternal(destFileName);
new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullDestFileName }, false, false ).Demand();
bool r = Win32Native.CopyFile(fullSourceFileName, fullDestFileName, !overwrite);
if (!r) {
// Save Win32 error because subsequent checks will overwrite this HRESULT.
int errorCode = Marshal.GetLastWin32Error();
String fileName = destFileName;
if (errorCode != Win32Native.ERROR_FILE_EXISTS) {
// For a number of error codes (sharing violation, path
// not found, etc) we don't know if the problem was with
// the source or dest file. Try reading the source file.
using(SafeFileHandle handle = Win32Native.UnsafeCreateFile(fullSourceFileName, FileStream.GENERIC_READ, FileShare.Read, null, FileMode.Open, 0, IntPtr.Zero)) {
if (handle.IsInvalid)
fileName = sourceFileName;
}
if (errorCode == Win32Native.ERROR_ACCESS_DENIED) {
if (Directory.InternalExists(fullDestFileName))
throw new IOException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Arg_FileIsDirectory_Name"), destFileName), Win32Native.ERROR_ACCESS_DENIED, fullDestFileName);
}
}
__Error.WinIOError(errorCode, fileName);
}
return fullDestFileName;
}
// Creates a file in a particular path. If the file exists, it is replaced.
// The file is opened with ReadWrite accessand cannot be opened by another
// application until it has been closed. An IOException is thrown if the
// directory specified doesn't exist.
//
// Your application must have Create, Read, and Write permissions to
// the file.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Create(String path) {
return Create(path, FileStream.DefaultBufferSize, FileOptions.None);
}
// Creates a file in a particular path. If the file exists, it is replaced.
// The file is opened with ReadWrite access and cannot be opened by another
// application until it has been closed. An IOException is thrown if the
// directory specified doesn't exist.
//
// Your application must have Create, Read, and Write permissions to
// the file.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Create(String path, int bufferSize) {
return Create(path, bufferSize, FileOptions.None);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Create(String path, int bufferSize, FileOptions options) {
return new FileStream(path, FileMode.Create, FileAccess.ReadWrite,
FileShare.None, bufferSize, options);
}
#if !FEATURE_PAL
public static FileStream Create(String path, int bufferSize, FileOptions options, FileSecurity fileSecurity) {
return new FileStream(path, FileMode.Create, FileSystemRights.Read | FileSystemRights.Write,
FileShare.None, bufferSize, options, fileSecurity);
}
#endif
// Deletes a file. The file specified by the designated path is deleted.
// If the file does not exist, Delete succeeds without throwing
// an exception.
//
// On NT, Delete will fail for a file that is open for normal I/O
// or a file that is memory mapped. On Win95, the file will be
// deleted irregardless of whether the file is being used.
//
// Your application must have Delete permission to the target file.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Delete(String path) {
if (path==null)
throw new ArgumentNullException("path");
String fullPath = Path.GetFullPathInternal(path);
// For security check, path should be resolved to an absolute path.
new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullPath }, false, false ).Demand();
if (Environment.IsWin9X() && Directory.InternalExists(fullPath)) // Win9x fails silently for directories.
throw new UnauthorizedAccessException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("UnauthorizedAccess_IODenied_Path"), path));
bool r = Win32Native.DeleteFile(fullPath);
if (!r) {
int hr = Marshal.GetLastWin32Error();
if (hr==Win32Native.ERROR_FILE_NOT_FOUND)
return;
else
__Error.WinIOError(hr, fullPath);
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Decrypt(String path)
{
if (path == null)
throw new ArgumentNullException("path");
#if FEATURE_PAL
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_RequiresNT"));
#else
if (!Environment.RunningOnWinNT)
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_Win9x"));
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read | FileIOPermissionAccess.Write, new String[] { fullPath }, false, false).Demand();
bool r = Win32Native.DecryptFile(fullPath, 0);
if (!r) {
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == Win32Native.ERROR_ACCESS_DENIED) {
// Check to see if the file system is not NTFS. If so,
// throw a different exception.
DriveInfo di = new DriveInfo(Path.GetPathRoot(fullPath));
if (!String.Equals("NTFS", di.DriveFormat))
throw new NotSupportedException(Environment.GetResourceString("NotSupported_EncryptionNeedsNTFS"));
}
__Error.WinIOError(errorCode, fullPath);
}
#endif
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Encrypt(String path)
{
if (path == null)
throw new ArgumentNullException("path");
#if FEATURE_PAL
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_RequiresNT"));
#else
if (!Environment.RunningOnWinNT)
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_Win9x"));
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read | FileIOPermissionAccess.Write, new String[] { fullPath }, false, false).Demand();
bool r = Win32Native.EncryptFile(fullPath);
if (!r) {
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == Win32Native.ERROR_ACCESS_DENIED) {
// Check to see if the file system is not NTFS. If so,
// throw a different exception.
DriveInfo di = new DriveInfo(Path.GetPathRoot(fullPath));
if (!String.Equals("NTFS", di.DriveFormat))
throw new NotSupportedException(Environment.GetResourceString("NotSupported_EncryptionNeedsNTFS"));
}
__Error.WinIOError(errorCode, fullPath);
}
#endif
}
// Tests if a file exists. The result is true if the file
// given by the specified path exists; otherwise, the result is
// false. Note that if path describes a directory,
// Exists will return true.
//
// Your application must have Read permission for the target directory.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static bool Exists(String path) {
try
{
if (path==null)
return false;
if (path.Length==0)
return false;
path = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { path }, false, false ).Demand();
return InternalExists(path);
}
catch(ArgumentException) {}
catch(NotSupportedException) {} // Security can throw this on ":"
catch(SecurityException) {}
catch(IOException) {}
catch(UnauthorizedAccessException) {}
return false;
}
internal static bool InternalExists(String path) {
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(path, ref data, false, true);
return (dataInitialised == 0) && (data.fileAttributes != -1)
&& ((data.fileAttributes & Win32Native.FILE_ATTRIBUTE_DIRECTORY) == 0);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Open(String path, FileMode mode) {
return Open(path, mode, (mode == FileMode.Append ? FileAccess.Write : FileAccess.ReadWrite), FileShare.None);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Open(String path, FileMode mode, FileAccess access) {
return Open(path,mode, access, FileShare.None);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Open(String path, FileMode mode, FileAccess access, FileShare share) {
return new FileStream(path, mode, access, share);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetCreationTime(String path, DateTime creationTime)
{
SetCreationTimeUtc(path, creationTime.ToUniversalTime());
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public unsafe static void SetCreationTimeUtc(String path, DateTime creationTimeUtc)
{
SafeFileHandle handle;
using(OpenFile(path, FileAccess.Write, out handle)) {
Win32Native.FILE_TIME fileTime = new Win32Native.FILE_TIME(creationTimeUtc.ToFileTimeUtc());
bool r = Win32Native.SetFileTime(handle, &fileTime, null, null);
if (!r)
{
int errorCode = Marshal.GetLastWin32Error();
__Error.WinIOError(errorCode, path);
}
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetCreationTime(String path)
{
return GetCreationTimeUtc(path).ToLocalTime();
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetCreationTimeUtc(String path)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullPath }, false, false ).Demand();
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(fullPath, ref data, false, false);
if (dataInitialised != 0)
__Error.WinIOError(dataInitialised, fullPath);
long dt = ((long)(data.ftCreationTimeHigh) << 32) | ((long)data.ftCreationTimeLow);
return DateTime.FromFileTimeUtc(dt);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetLastAccessTime(String path, DateTime lastAccessTime)
{
SetLastAccessTimeUtc(path, lastAccessTime.ToUniversalTime());
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public unsafe static void SetLastAccessTimeUtc(String path, DateTime lastAccessTimeUtc)
{
SafeFileHandle handle;
using(OpenFile(path, FileAccess.Write, out handle)) {
Win32Native.FILE_TIME fileTime = new Win32Native.FILE_TIME(lastAccessTimeUtc.ToFileTimeUtc());
bool r = Win32Native.SetFileTime(handle, null, &fileTime, null);
if (!r)
{
int errorCode = Marshal.GetLastWin32Error();
__Error.WinIOError(errorCode, path);
}
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetLastAccessTime(String path)
{
return GetLastAccessTimeUtc(path).ToLocalTime();
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetLastAccessTimeUtc(String path)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullPath }, false, false ).Demand();
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(fullPath, ref data, false, false);
if (dataInitialised != 0)
__Error.WinIOError(dataInitialised, fullPath);
long dt = ((long)(data.ftLastAccessTimeHigh) << 32) | ((long)data.ftLastAccessTimeLow);
return DateTime.FromFileTimeUtc(dt);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetLastWriteTime(String path, DateTime lastWriteTime)
{
SetLastWriteTimeUtc(path, lastWriteTime.ToUniversalTime());
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public unsafe static void SetLastWriteTimeUtc(String path, DateTime lastWriteTimeUtc)
{
SafeFileHandle handle;
using(OpenFile(path, FileAccess.Write, out handle)) {
Win32Native.FILE_TIME fileTime = new Win32Native.FILE_TIME(lastWriteTimeUtc.ToFileTimeUtc());
bool r = Win32Native.SetFileTime(handle, null, null, &fileTime);
if (!r)
{
int errorCode = Marshal.GetLastWin32Error();
__Error.WinIOError(errorCode, path);
}
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetLastWriteTime(String path)
{
return GetLastWriteTimeUtc(path).ToLocalTime();
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetLastWriteTimeUtc(String path)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullPath }, false, false ).Demand();
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(fullPath, ref data, false, false);
if (dataInitialised != 0)
__Error.WinIOError(dataInitialised, fullPath);
long dt = ((long)data.ftLastWriteTimeHigh << 32) | ((long)data.ftLastWriteTimeLow);
return DateTime.FromFileTimeUtc(dt);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileAttributes GetAttributes(String path)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullPath }, false, false).Demand();
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(fullPath, ref data, false, true);
if (dataInitialised != 0)
__Error.WinIOError(dataInitialised, fullPath);
return (FileAttributes) data.fileAttributes;
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetAttributes(String path, FileAttributes fileAttributes)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullPath }, false, false).Demand();
bool r = Win32Native.SetFileAttributes(fullPath, (int) fileAttributes);
if (!r) {
int hr = Marshal.GetLastWin32Error();
if (hr==ERROR_INVALID_PARAMETER || (hr==ERROR_ACCESS_DENIED && Environment.IsWin9X())) // Win9x returns Access denied sometimes
throw new ArgumentException(Environment.GetResourceString("Arg_InvalidFileAttrs"));
__Error.WinIOError(hr, fullPath);
}
}
#if !FEATURE_PAL
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileSecurity GetAccessControl(String path)
{
return GetAccessControl(path, AccessControlSections.Access | AccessControlSections.Owner | AccessControlSections.Group);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileSecurity GetAccessControl(String path, AccessControlSections includeSections)
{
// Appropriate security check should be done for us by FileSecurity.
return new FileSecurity(path, includeSections);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetAccessControl(String path, FileSecurity fileSecurity)
{
if (fileSecurity == null)
throw new ArgumentNullException("fileSecurity");
String fullPath = Path.GetFullPathInternal(path);
// Appropriate security check should be done for us by FileSecurity.
fileSecurity.Persist(fullPath);
}
#endif
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream OpenRead(String path) {
return new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream OpenWrite(String path) {
return new FileStream(path, FileMode.OpenOrCreate,
FileAccess.Write, FileShare.None);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static String ReadAllText(String path)
{
return ReadAllText(path, Encoding.UTF8);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static String ReadAllText(String path, Encoding encoding)
{
using(StreamReader sr = new StreamReader(path, encoding))
return sr.ReadToEnd();
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllText(String path, String contents)
{
WriteAllText(path, contents, StreamWriter.UTF8NoBOM);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllText(String path, String contents, Encoding encoding)
{
using(StreamWriter sw = new StreamWriter(path, false, encoding))
sw.Write(contents);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static byte[] ReadAllBytes(String path)
{
byte[] bytes;
using(FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read)) {
// Do a blocking read
int index = 0;
long fileLength = fs.Length;
if (fileLength > Int32.MaxValue)
throw new IOException(Environment.GetResourceString("IO.IO_FileTooLong2GB"));
int count = (int) fileLength;
bytes = new byte[count];
while(count > 0) {
int n = fs.Read(bytes, index, count);
if (n == 0)
__Error.EndOfFile();
index += n;
count -= n;
}
}
return bytes;
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllBytes(String path, byte[] bytes)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
using(FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read))
fs.Write(bytes, 0, bytes.Length);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static String[] ReadAllLines(String path)
{
return ReadAllLines(path, Encoding.UTF8);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static String[] ReadAllLines(String path, Encoding encoding)
{
String line;
ArrayList lines = new ArrayList();
using(StreamReader sr = new StreamReader(path, encoding))
while((line = sr.ReadLine()) != null)
lines.Add(line);
return (String[]) lines.ToArray(typeof(String));
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllLines(String path, String[] contents)
{
WriteAllLines(path, contents, StreamWriter.UTF8NoBOM);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllLines(String path, String[] contents, Encoding encoding)
{
if (contents == null)
throw new ArgumentNullException("contents");
using(StreamWriter sw = new StreamWriter(path, false, encoding))
foreach(String line in contents)
sw.WriteLine(line);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void AppendAllText(String path, String contents)
{
AppendAllText(path, contents, StreamWriter.UTF8NoBOM);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void AppendAllText(String path, String contents, Encoding encoding)
{
using(StreamWriter sw = new StreamWriter(path, true, encoding))
sw.Write(contents);
}
// Moves a specified file to a new location and potentially a new file name.
// This method does work across volumes.
//
// The caller must have certain FileIOPermissions. The caller must
// have Read and Write permission to
// sourceFileName and Write
// permissions to destFileName.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Move(String sourceFileName, String destFileName) {
if (sourceFileName==null || destFileName==null)
throw new ArgumentNullException((sourceFileName==null ? "sourceFileName" : "destFileName"), Environment.GetResourceString("ArgumentNull_FileName"));
if (sourceFileName.Length==0 || destFileName.Length==0)
throw new ArgumentException(Environment.GetResourceString("Argument_EmptyFileName"), (sourceFileName.Length==0 ? "sourceFileName" : "destFileName"));
String fullSourceFileName = Path.GetFullPathInternal(sourceFileName);
new FileIOPermission(FileIOPermissionAccess.Write | FileIOPermissionAccess.Read, new String[] { fullSourceFileName }, false, false).Demand();
String fullDestFileName = Path.GetFullPathInternal(destFileName);
new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullDestFileName }, false, false).Demand();
if (!InternalExists(fullSourceFileName))
__Error.WinIOError(Win32Native.ERROR_FILE_NOT_FOUND, fullSourceFileName);
if (!Win32Native.MoveFile(fullSourceFileName, fullDestFileName))
{
__Error.WinIOError();
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Replace(String sourceFileName, String destinationFileName, String destinationBackupFileName)
{
Replace(sourceFileName, destinationFileName, destinationBackupFileName, false);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Replace(String sourceFileName, String destinationFileName, String destinationBackupFileName, bool ignoreMetadataErrors)
{
if (sourceFileName == null)
throw new ArgumentNullException("sourceFileName");
if (destinationFileName == null)
throw new ArgumentNullException("destinationFileName");
// Write permission to all three files, read permission to source
// and dest.
String fullSrcPath = Path.GetFullPathInternal(sourceFileName);
String fullDestPath = Path.GetFullPathInternal(destinationFileName);
String fullBackupPath = null;
if (destinationBackupFileName != null)
fullBackupPath = Path.GetFullPathInternal(destinationBackupFileName);
FileIOPermission perm = new FileIOPermission(FileIOPermissionAccess.Read | FileIOPermissionAccess.Write, new String[] { fullSrcPath, fullDestPath});
if (destinationBackupFileName != null)
perm.AddPathList(FileIOPermissionAccess.Write, fullBackupPath);
perm.Demand();
#if !FEATURE_PAL
// Win9x doesn't support ReplaceFile
if (Environment.OSVersion.Platform == PlatformID.Win32Windows)
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_Win9x"));
#endif
int flags = Win32Native.REPLACEFILE_WRITE_THROUGH;
if (ignoreMetadataErrors)
flags |= Win32Native.REPLACEFILE_IGNORE_MERGE_ERRORS;
bool r = Win32Native.ReplaceFile(fullDestPath, fullSrcPath, fullBackupPath, flags, IntPtr.Zero, IntPtr.Zero);
if (!r)
__Error.WinIOError();
}
// Returns 0 on success, otherwise a Win32 error code. Note that
// classes should use -1 as the uninitialized state for dataInitialized.
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
internal static int FillAttributeInfo(String path, ref Win32Native.WIN32_FILE_ATTRIBUTE_DATA data, bool tryagain, bool returnErrorOnNotFound)
{
int dataInitialised = 0;
#if !FEATURE_PAL
if (Environment.OSInfo == Environment.OSName.Win95 || tryagain)
// We are running under Windows 95 and we don't have GetFileAttributesEx API or someone has a handle to the file open
#else
if (tryagain) // someone has a handle to the file open, or other error
#endif //!FEATURE_PAL
{
Win32Native.WIN32_FIND_DATA win95data; // We do this only on Win95 machines
win95data = new Win32Native.WIN32_FIND_DATA ();
// Remove trialing slash since this can cause grief to FindFirstFile. You will get an invalid argument error
String tempPath = path.TrimEnd(new char [] {Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar});
// For floppy drives, normally the OS will pop up a dialog saying
// there is no disk in drive A:, please insert one. We don't want that.
// SetErrorMode will let us disable this, but we should set the error
// mode back, since this may have wide-ranging effects.
int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS);
try {
bool error = false;
SafeFindHandle handle = Win32Native.FindFirstFile(tempPath,win95data);
try {
if (handle.IsInvalid) {
error = true;
dataInitialised = Marshal.GetLastWin32Error();
if (dataInitialised == Win32Native.ERROR_FILE_NOT_FOUND ||
dataInitialised == Win32Native.ERROR_PATH_NOT_FOUND ||
dataInitialised == Win32Native.ERROR_NOT_READY) // floppy device not ready
{
if (!returnErrorOnNotFound) {
// Return default value for backward compbatibility
dataInitialised = 0;
data.fileAttributes = -1;
}
}
return dataInitialised;
}
}
finally {
// Close the Win32 handle
try {
handle.Close();
}
catch {
// if we're already returning an error, don't throw another one.
if (!error) {
BCLDebug.Assert(false, "File::FillAttributeInfo - FindClose failed!");
__Error.WinIOError();
}
}
}
}
finally {
Win32Native.SetErrorMode(oldMode);
}
// Copy the information to data
data.fileAttributes = win95data.dwFileAttributes;
data.ftCreationTimeLow = (uint)win95data.ftCreationTime_dwLowDateTime;
data.ftCreationTimeHigh = (uint)win95data.ftCreationTime_dwHighDateTime;
data.ftLastAccessTimeLow = (uint)win95data.ftLastAccessTime_dwLowDateTime;
data.ftLastAccessTimeHigh = (uint)win95data.ftLastAccessTime_dwHighDateTime;
data.ftLastWriteTimeLow = (uint)win95data.ftLastWriteTime_dwLowDateTime;
data.ftLastWriteTimeHigh = (uint)win95data.ftLastWriteTime_dwHighDateTime;
data.fileSizeHigh = win95data.nFileSizeHigh;
data.fileSizeLow = win95data.nFileSizeLow;
}
else
{
// For floppy drives, normally the OS will pop up a dialog saying
// there is no disk in drive A:, please insert one. We don't want that.
// SetErrorMode will let us disable this, but we should set the error
// mode back, since this may have wide-ranging effects.
bool success = false;
int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS);
try {
success = Win32Native.GetFileAttributesEx(path, GetFileExInfoStandard, ref data);
}
finally {
Win32Native.SetErrorMode(oldMode);
}
if (!success) {
dataInitialised = Marshal.GetLastWin32Error();
if (dataInitialised != Win32Native.ERROR_FILE_NOT_FOUND &&
dataInitialised != Win32Native.ERROR_PATH_NOT_FOUND &&
dataInitialised != Win32Native.ERROR_NOT_READY) // floppy device not ready
{
// In case someone latched onto the file. Take the perf hit only for failure
return FillAttributeInfo(path, ref data, true, returnErrorOnNotFound);
}
else {
if (!returnErrorOnNotFound) {
// Return default value for backward compbatibility
dataInitialised = 0;
data.fileAttributes = -1;
}
}
}
}
return dataInitialised;
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
private static FileStream OpenFile(String path, FileAccess access, out SafeFileHandle handle)
{
FileStream fs = new FileStream(path, FileMode.Open, access, FileShare.ReadWrite, 1);
handle = fs.SafeFileHandle;
if (handle.IsInvalid) {
// Return a meaningful error, using the RELATIVE path to
// the file to avoid returning extra information to the caller.
// NT5 oddity - when trying to open "C:\" as a FileStream,
// we usually get ERROR_PATH_NOT_FOUND from the OS. We should
// probably be consistent w/ every other directory.
int hr = Marshal.GetLastWin32Error();
String FullPath = Path.GetFullPathInternal(path);
if (hr==__Error.ERROR_PATH_NOT_FOUND && FullPath.Equals(Directory.GetDirectoryRoot(FullPath)))
hr = __Error.ERROR_ACCESS_DENIED;
__Error.WinIOError(hr, path);
}
return fs;
}
// Defined in WinError.h
private const int ERROR_INVALID_PARAMETER = 87;
private const int ERROR_ACCESS_DENIED = 0x5;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
/*============================================================
**
** Class: File
**
**
** Purpose: A collection of methods for manipulating Files.
**
** April 09,2000 (some design refactorization)
**
===========================================================*/
using System;
using System.Security.Permissions;
using PermissionSet = System.Security.PermissionSet;
using Win32Native = Microsoft.Win32.Win32Native;
using System.Runtime.InteropServices;
using System.Security;
#if !FEATURE_PAL
using System.Security.AccessControl;
#endif
using System.Text;
using Microsoft.Win32.SafeHandles;
using System.Collections;
using System.Globalization;
using System.Runtime.Versioning;
namespace System.IO {
// Class for creating FileStream objects, and some basic file management
// routines such as Delete, etc.
[ComVisible(true)]
public static class File
{
private const int GetFileExInfoStandard = 0;
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static StreamReader OpenText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
return new StreamReader(path);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static StreamWriter CreateText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
return new StreamWriter(path,false);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static StreamWriter AppendText(String path)
{
if (path == null)
throw new ArgumentNullException("path");
return new StreamWriter(path,true);
}
// Copies an existing file to a new file. An exception is raised if the
// destination file already exists. Use the
// Copy(String, String, boolean) method to allow
// overwriting an existing file.
//
// The caller must have certain FileIOPermissions. The caller must have
// Read permission to sourceFileName and Create
// and Write permissions to destFileName.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Copy(String sourceFileName, String destFileName) {
Copy(sourceFileName, destFileName, false);
}
// Copies an existing file to a new file. If overwrite is
// false, then an IOException is thrown if the destination file
// already exists. If overwrite is true, the file is
// overwritten.
//
// The caller must have certain FileIOPermissions. The caller must have
// Read permission to sourceFileName
// and Write permissions to destFileName.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Copy(String sourceFileName, String destFileName, bool overwrite) {
InternalCopy(sourceFileName, destFileName,overwrite);
}
///
/// Note: This returns the fully qualified name of the destination file.
///
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
internal static String InternalCopy(String sourceFileName, String destFileName, bool overwrite) {
if (sourceFileName==null || destFileName==null)
throw new ArgumentNullException((sourceFileName==null ? "sourceFileName" : "destFileName"), Environment.GetResourceString("ArgumentNull_FileName"));
if (sourceFileName.Length==0 || destFileName.Length==0)
throw new ArgumentException(Environment.GetResourceString("Argument_EmptyFileName"), (sourceFileName.Length==0 ? "sourceFileName" : "destFileName"));
String fullSourceFileName = Path.GetFullPathInternal(sourceFileName);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullSourceFileName }, false, false ).Demand();
String fullDestFileName = Path.GetFullPathInternal(destFileName);
new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullDestFileName }, false, false ).Demand();
bool r = Win32Native.CopyFile(fullSourceFileName, fullDestFileName, !overwrite);
if (!r) {
// Save Win32 error because subsequent checks will overwrite this HRESULT.
int errorCode = Marshal.GetLastWin32Error();
String fileName = destFileName;
if (errorCode != Win32Native.ERROR_FILE_EXISTS) {
// For a number of error codes (sharing violation, path
// not found, etc) we don't know if the problem was with
// the source or dest file. Try reading the source file.
using(SafeFileHandle handle = Win32Native.UnsafeCreateFile(fullSourceFileName, FileStream.GENERIC_READ, FileShare.Read, null, FileMode.Open, 0, IntPtr.Zero)) {
if (handle.IsInvalid)
fileName = sourceFileName;
}
if (errorCode == Win32Native.ERROR_ACCESS_DENIED) {
if (Directory.InternalExists(fullDestFileName))
throw new IOException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Arg_FileIsDirectory_Name"), destFileName), Win32Native.ERROR_ACCESS_DENIED, fullDestFileName);
}
}
__Error.WinIOError(errorCode, fileName);
}
return fullDestFileName;
}
// Creates a file in a particular path. If the file exists, it is replaced.
// The file is opened with ReadWrite accessand cannot be opened by another
// application until it has been closed. An IOException is thrown if the
// directory specified doesn't exist.
//
// Your application must have Create, Read, and Write permissions to
// the file.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Create(String path) {
return Create(path, FileStream.DefaultBufferSize, FileOptions.None);
}
// Creates a file in a particular path. If the file exists, it is replaced.
// The file is opened with ReadWrite access and cannot be opened by another
// application until it has been closed. An IOException is thrown if the
// directory specified doesn't exist.
//
// Your application must have Create, Read, and Write permissions to
// the file.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Create(String path, int bufferSize) {
return Create(path, bufferSize, FileOptions.None);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Create(String path, int bufferSize, FileOptions options) {
return new FileStream(path, FileMode.Create, FileAccess.ReadWrite,
FileShare.None, bufferSize, options);
}
#if !FEATURE_PAL
public static FileStream Create(String path, int bufferSize, FileOptions options, FileSecurity fileSecurity) {
return new FileStream(path, FileMode.Create, FileSystemRights.Read | FileSystemRights.Write,
FileShare.None, bufferSize, options, fileSecurity);
}
#endif
// Deletes a file. The file specified by the designated path is deleted.
// If the file does not exist, Delete succeeds without throwing
// an exception.
//
// On NT, Delete will fail for a file that is open for normal I/O
// or a file that is memory mapped. On Win95, the file will be
// deleted irregardless of whether the file is being used.
//
// Your application must have Delete permission to the target file.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Delete(String path) {
if (path==null)
throw new ArgumentNullException("path");
String fullPath = Path.GetFullPathInternal(path);
// For security check, path should be resolved to an absolute path.
new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullPath }, false, false ).Demand();
if (Environment.IsWin9X() && Directory.InternalExists(fullPath)) // Win9x fails silently for directories.
throw new UnauthorizedAccessException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("UnauthorizedAccess_IODenied_Path"), path));
bool r = Win32Native.DeleteFile(fullPath);
if (!r) {
int hr = Marshal.GetLastWin32Error();
if (hr==Win32Native.ERROR_FILE_NOT_FOUND)
return;
else
__Error.WinIOError(hr, fullPath);
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Decrypt(String path)
{
if (path == null)
throw new ArgumentNullException("path");
#if FEATURE_PAL
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_RequiresNT"));
#else
if (!Environment.RunningOnWinNT)
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_Win9x"));
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read | FileIOPermissionAccess.Write, new String[] { fullPath }, false, false).Demand();
bool r = Win32Native.DecryptFile(fullPath, 0);
if (!r) {
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == Win32Native.ERROR_ACCESS_DENIED) {
// Check to see if the file system is not NTFS. If so,
// throw a different exception.
DriveInfo di = new DriveInfo(Path.GetPathRoot(fullPath));
if (!String.Equals("NTFS", di.DriveFormat))
throw new NotSupportedException(Environment.GetResourceString("NotSupported_EncryptionNeedsNTFS"));
}
__Error.WinIOError(errorCode, fullPath);
}
#endif
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Encrypt(String path)
{
if (path == null)
throw new ArgumentNullException("path");
#if FEATURE_PAL
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_RequiresNT"));
#else
if (!Environment.RunningOnWinNT)
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_Win9x"));
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read | FileIOPermissionAccess.Write, new String[] { fullPath }, false, false).Demand();
bool r = Win32Native.EncryptFile(fullPath);
if (!r) {
int errorCode = Marshal.GetLastWin32Error();
if (errorCode == Win32Native.ERROR_ACCESS_DENIED) {
// Check to see if the file system is not NTFS. If so,
// throw a different exception.
DriveInfo di = new DriveInfo(Path.GetPathRoot(fullPath));
if (!String.Equals("NTFS", di.DriveFormat))
throw new NotSupportedException(Environment.GetResourceString("NotSupported_EncryptionNeedsNTFS"));
}
__Error.WinIOError(errorCode, fullPath);
}
#endif
}
// Tests if a file exists. The result is true if the file
// given by the specified path exists; otherwise, the result is
// false. Note that if path describes a directory,
// Exists will return true.
//
// Your application must have Read permission for the target directory.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static bool Exists(String path) {
try
{
if (path==null)
return false;
if (path.Length==0)
return false;
path = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { path }, false, false ).Demand();
return InternalExists(path);
}
catch(ArgumentException) {}
catch(NotSupportedException) {} // Security can throw this on ":"
catch(SecurityException) {}
catch(IOException) {}
catch(UnauthorizedAccessException) {}
return false;
}
internal static bool InternalExists(String path) {
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(path, ref data, false, true);
return (dataInitialised == 0) && (data.fileAttributes != -1)
&& ((data.fileAttributes & Win32Native.FILE_ATTRIBUTE_DIRECTORY) == 0);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Open(String path, FileMode mode) {
return Open(path, mode, (mode == FileMode.Append ? FileAccess.Write : FileAccess.ReadWrite), FileShare.None);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Open(String path, FileMode mode, FileAccess access) {
return Open(path,mode, access, FileShare.None);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream Open(String path, FileMode mode, FileAccess access, FileShare share) {
return new FileStream(path, mode, access, share);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetCreationTime(String path, DateTime creationTime)
{
SetCreationTimeUtc(path, creationTime.ToUniversalTime());
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public unsafe static void SetCreationTimeUtc(String path, DateTime creationTimeUtc)
{
SafeFileHandle handle;
using(OpenFile(path, FileAccess.Write, out handle)) {
Win32Native.FILE_TIME fileTime = new Win32Native.FILE_TIME(creationTimeUtc.ToFileTimeUtc());
bool r = Win32Native.SetFileTime(handle, &fileTime, null, null);
if (!r)
{
int errorCode = Marshal.GetLastWin32Error();
__Error.WinIOError(errorCode, path);
}
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetCreationTime(String path)
{
return GetCreationTimeUtc(path).ToLocalTime();
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetCreationTimeUtc(String path)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullPath }, false, false ).Demand();
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(fullPath, ref data, false, false);
if (dataInitialised != 0)
__Error.WinIOError(dataInitialised, fullPath);
long dt = ((long)(data.ftCreationTimeHigh) << 32) | ((long)data.ftCreationTimeLow);
return DateTime.FromFileTimeUtc(dt);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetLastAccessTime(String path, DateTime lastAccessTime)
{
SetLastAccessTimeUtc(path, lastAccessTime.ToUniversalTime());
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public unsafe static void SetLastAccessTimeUtc(String path, DateTime lastAccessTimeUtc)
{
SafeFileHandle handle;
using(OpenFile(path, FileAccess.Write, out handle)) {
Win32Native.FILE_TIME fileTime = new Win32Native.FILE_TIME(lastAccessTimeUtc.ToFileTimeUtc());
bool r = Win32Native.SetFileTime(handle, null, &fileTime, null);
if (!r)
{
int errorCode = Marshal.GetLastWin32Error();
__Error.WinIOError(errorCode, path);
}
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetLastAccessTime(String path)
{
return GetLastAccessTimeUtc(path).ToLocalTime();
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetLastAccessTimeUtc(String path)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullPath }, false, false ).Demand();
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(fullPath, ref data, false, false);
if (dataInitialised != 0)
__Error.WinIOError(dataInitialised, fullPath);
long dt = ((long)(data.ftLastAccessTimeHigh) << 32) | ((long)data.ftLastAccessTimeLow);
return DateTime.FromFileTimeUtc(dt);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetLastWriteTime(String path, DateTime lastWriteTime)
{
SetLastWriteTimeUtc(path, lastWriteTime.ToUniversalTime());
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public unsafe static void SetLastWriteTimeUtc(String path, DateTime lastWriteTimeUtc)
{
SafeFileHandle handle;
using(OpenFile(path, FileAccess.Write, out handle)) {
Win32Native.FILE_TIME fileTime = new Win32Native.FILE_TIME(lastWriteTimeUtc.ToFileTimeUtc());
bool r = Win32Native.SetFileTime(handle, null, null, &fileTime);
if (!r)
{
int errorCode = Marshal.GetLastWin32Error();
__Error.WinIOError(errorCode, path);
}
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetLastWriteTime(String path)
{
return GetLastWriteTimeUtc(path).ToLocalTime();
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static DateTime GetLastWriteTimeUtc(String path)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullPath }, false, false ).Demand();
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(fullPath, ref data, false, false);
if (dataInitialised != 0)
__Error.WinIOError(dataInitialised, fullPath);
long dt = ((long)data.ftLastWriteTimeHigh << 32) | ((long)data.ftLastWriteTimeLow);
return DateTime.FromFileTimeUtc(dt);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileAttributes GetAttributes(String path)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Read, new String[] { fullPath }, false, false).Demand();
Win32Native.WIN32_FILE_ATTRIBUTE_DATA data = new Win32Native.WIN32_FILE_ATTRIBUTE_DATA();
int dataInitialised = FillAttributeInfo(fullPath, ref data, false, true);
if (dataInitialised != 0)
__Error.WinIOError(dataInitialised, fullPath);
return (FileAttributes) data.fileAttributes;
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetAttributes(String path, FileAttributes fileAttributes)
{
String fullPath = Path.GetFullPathInternal(path);
new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullPath }, false, false).Demand();
bool r = Win32Native.SetFileAttributes(fullPath, (int) fileAttributes);
if (!r) {
int hr = Marshal.GetLastWin32Error();
if (hr==ERROR_INVALID_PARAMETER || (hr==ERROR_ACCESS_DENIED && Environment.IsWin9X())) // Win9x returns Access denied sometimes
throw new ArgumentException(Environment.GetResourceString("Arg_InvalidFileAttrs"));
__Error.WinIOError(hr, fullPath);
}
}
#if !FEATURE_PAL
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileSecurity GetAccessControl(String path)
{
return GetAccessControl(path, AccessControlSections.Access | AccessControlSections.Owner | AccessControlSections.Group);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileSecurity GetAccessControl(String path, AccessControlSections includeSections)
{
// Appropriate security check should be done for us by FileSecurity.
return new FileSecurity(path, includeSections);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void SetAccessControl(String path, FileSecurity fileSecurity)
{
if (fileSecurity == null)
throw new ArgumentNullException("fileSecurity");
String fullPath = Path.GetFullPathInternal(path);
// Appropriate security check should be done for us by FileSecurity.
fileSecurity.Persist(fullPath);
}
#endif
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream OpenRead(String path) {
return new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static FileStream OpenWrite(String path) {
return new FileStream(path, FileMode.OpenOrCreate,
FileAccess.Write, FileShare.None);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static String ReadAllText(String path)
{
return ReadAllText(path, Encoding.UTF8);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static String ReadAllText(String path, Encoding encoding)
{
using(StreamReader sr = new StreamReader(path, encoding))
return sr.ReadToEnd();
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllText(String path, String contents)
{
WriteAllText(path, contents, StreamWriter.UTF8NoBOM);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllText(String path, String contents, Encoding encoding)
{
using(StreamWriter sw = new StreamWriter(path, false, encoding))
sw.Write(contents);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static byte[] ReadAllBytes(String path)
{
byte[] bytes;
using(FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read)) {
// Do a blocking read
int index = 0;
long fileLength = fs.Length;
if (fileLength > Int32.MaxValue)
throw new IOException(Environment.GetResourceString("IO.IO_FileTooLong2GB"));
int count = (int) fileLength;
bytes = new byte[count];
while(count > 0) {
int n = fs.Read(bytes, index, count);
if (n == 0)
__Error.EndOfFile();
index += n;
count -= n;
}
}
return bytes;
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllBytes(String path, byte[] bytes)
{
if (bytes == null)
throw new ArgumentNullException("bytes");
using(FileStream fs = new FileStream(path, FileMode.Create, FileAccess.Write, FileShare.Read))
fs.Write(bytes, 0, bytes.Length);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static String[] ReadAllLines(String path)
{
return ReadAllLines(path, Encoding.UTF8);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static String[] ReadAllLines(String path, Encoding encoding)
{
String line;
ArrayList lines = new ArrayList();
using(StreamReader sr = new StreamReader(path, encoding))
while((line = sr.ReadLine()) != null)
lines.Add(line);
return (String[]) lines.ToArray(typeof(String));
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllLines(String path, String[] contents)
{
WriteAllLines(path, contents, StreamWriter.UTF8NoBOM);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void WriteAllLines(String path, String[] contents, Encoding encoding)
{
if (contents == null)
throw new ArgumentNullException("contents");
using(StreamWriter sw = new StreamWriter(path, false, encoding))
foreach(String line in contents)
sw.WriteLine(line);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void AppendAllText(String path, String contents)
{
AppendAllText(path, contents, StreamWriter.UTF8NoBOM);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void AppendAllText(String path, String contents, Encoding encoding)
{
using(StreamWriter sw = new StreamWriter(path, true, encoding))
sw.Write(contents);
}
// Moves a specified file to a new location and potentially a new file name.
// This method does work across volumes.
//
// The caller must have certain FileIOPermissions. The caller must
// have Read and Write permission to
// sourceFileName and Write
// permissions to destFileName.
//
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Move(String sourceFileName, String destFileName) {
if (sourceFileName==null || destFileName==null)
throw new ArgumentNullException((sourceFileName==null ? "sourceFileName" : "destFileName"), Environment.GetResourceString("ArgumentNull_FileName"));
if (sourceFileName.Length==0 || destFileName.Length==0)
throw new ArgumentException(Environment.GetResourceString("Argument_EmptyFileName"), (sourceFileName.Length==0 ? "sourceFileName" : "destFileName"));
String fullSourceFileName = Path.GetFullPathInternal(sourceFileName);
new FileIOPermission(FileIOPermissionAccess.Write | FileIOPermissionAccess.Read, new String[] { fullSourceFileName }, false, false).Demand();
String fullDestFileName = Path.GetFullPathInternal(destFileName);
new FileIOPermission(FileIOPermissionAccess.Write, new String[] { fullDestFileName }, false, false).Demand();
if (!InternalExists(fullSourceFileName))
__Error.WinIOError(Win32Native.ERROR_FILE_NOT_FOUND, fullSourceFileName);
if (!Win32Native.MoveFile(fullSourceFileName, fullDestFileName))
{
__Error.WinIOError();
}
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Replace(String sourceFileName, String destinationFileName, String destinationBackupFileName)
{
Replace(sourceFileName, destinationFileName, destinationBackupFileName, false);
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
public static void Replace(String sourceFileName, String destinationFileName, String destinationBackupFileName, bool ignoreMetadataErrors)
{
if (sourceFileName == null)
throw new ArgumentNullException("sourceFileName");
if (destinationFileName == null)
throw new ArgumentNullException("destinationFileName");
// Write permission to all three files, read permission to source
// and dest.
String fullSrcPath = Path.GetFullPathInternal(sourceFileName);
String fullDestPath = Path.GetFullPathInternal(destinationFileName);
String fullBackupPath = null;
if (destinationBackupFileName != null)
fullBackupPath = Path.GetFullPathInternal(destinationBackupFileName);
FileIOPermission perm = new FileIOPermission(FileIOPermissionAccess.Read | FileIOPermissionAccess.Write, new String[] { fullSrcPath, fullDestPath});
if (destinationBackupFileName != null)
perm.AddPathList(FileIOPermissionAccess.Write, fullBackupPath);
perm.Demand();
#if !FEATURE_PAL
// Win9x doesn't support ReplaceFile
if (Environment.OSVersion.Platform == PlatformID.Win32Windows)
throw new PlatformNotSupportedException(Environment.GetResourceString("PlatformNotSupported_Win9x"));
#endif
int flags = Win32Native.REPLACEFILE_WRITE_THROUGH;
if (ignoreMetadataErrors)
flags |= Win32Native.REPLACEFILE_IGNORE_MERGE_ERRORS;
bool r = Win32Native.ReplaceFile(fullDestPath, fullSrcPath, fullBackupPath, flags, IntPtr.Zero, IntPtr.Zero);
if (!r)
__Error.WinIOError();
}
// Returns 0 on success, otherwise a Win32 error code. Note that
// classes should use -1 as the uninitialized state for dataInitialized.
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
internal static int FillAttributeInfo(String path, ref Win32Native.WIN32_FILE_ATTRIBUTE_DATA data, bool tryagain, bool returnErrorOnNotFound)
{
int dataInitialised = 0;
#if !FEATURE_PAL
if (Environment.OSInfo == Environment.OSName.Win95 || tryagain)
// We are running under Windows 95 and we don't have GetFileAttributesEx API or someone has a handle to the file open
#else
if (tryagain) // someone has a handle to the file open, or other error
#endif //!FEATURE_PAL
{
Win32Native.WIN32_FIND_DATA win95data; // We do this only on Win95 machines
win95data = new Win32Native.WIN32_FIND_DATA ();
// Remove trialing slash since this can cause grief to FindFirstFile. You will get an invalid argument error
String tempPath = path.TrimEnd(new char [] {Path.DirectorySeparatorChar, Path.AltDirectorySeparatorChar});
// For floppy drives, normally the OS will pop up a dialog saying
// there is no disk in drive A:, please insert one. We don't want that.
// SetErrorMode will let us disable this, but we should set the error
// mode back, since this may have wide-ranging effects.
int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS);
try {
bool error = false;
SafeFindHandle handle = Win32Native.FindFirstFile(tempPath,win95data);
try {
if (handle.IsInvalid) {
error = true;
dataInitialised = Marshal.GetLastWin32Error();
if (dataInitialised == Win32Native.ERROR_FILE_NOT_FOUND ||
dataInitialised == Win32Native.ERROR_PATH_NOT_FOUND ||
dataInitialised == Win32Native.ERROR_NOT_READY) // floppy device not ready
{
if (!returnErrorOnNotFound) {
// Return default value for backward compbatibility
dataInitialised = 0;
data.fileAttributes = -1;
}
}
return dataInitialised;
}
}
finally {
// Close the Win32 handle
try {
handle.Close();
}
catch {
// if we're already returning an error, don't throw another one.
if (!error) {
BCLDebug.Assert(false, "File::FillAttributeInfo - FindClose failed!");
__Error.WinIOError();
}
}
}
}
finally {
Win32Native.SetErrorMode(oldMode);
}
// Copy the information to data
data.fileAttributes = win95data.dwFileAttributes;
data.ftCreationTimeLow = (uint)win95data.ftCreationTime_dwLowDateTime;
data.ftCreationTimeHigh = (uint)win95data.ftCreationTime_dwHighDateTime;
data.ftLastAccessTimeLow = (uint)win95data.ftLastAccessTime_dwLowDateTime;
data.ftLastAccessTimeHigh = (uint)win95data.ftLastAccessTime_dwHighDateTime;
data.ftLastWriteTimeLow = (uint)win95data.ftLastWriteTime_dwLowDateTime;
data.ftLastWriteTimeHigh = (uint)win95data.ftLastWriteTime_dwHighDateTime;
data.fileSizeHigh = win95data.nFileSizeHigh;
data.fileSizeLow = win95data.nFileSizeLow;
}
else
{
// For floppy drives, normally the OS will pop up a dialog saying
// there is no disk in drive A:, please insert one. We don't want that.
// SetErrorMode will let us disable this, but we should set the error
// mode back, since this may have wide-ranging effects.
bool success = false;
int oldMode = Win32Native.SetErrorMode(Win32Native.SEM_FAILCRITICALERRORS);
try {
success = Win32Native.GetFileAttributesEx(path, GetFileExInfoStandard, ref data);
}
finally {
Win32Native.SetErrorMode(oldMode);
}
if (!success) {
dataInitialised = Marshal.GetLastWin32Error();
if (dataInitialised != Win32Native.ERROR_FILE_NOT_FOUND &&
dataInitialised != Win32Native.ERROR_PATH_NOT_FOUND &&
dataInitialised != Win32Native.ERROR_NOT_READY) // floppy device not ready
{
// In case someone latched onto the file. Take the perf hit only for failure
return FillAttributeInfo(path, ref data, true, returnErrorOnNotFound);
}
else {
if (!returnErrorOnNotFound) {
// Return default value for backward compbatibility
dataInitialised = 0;
data.fileAttributes = -1;
}
}
}
}
return dataInitialised;
}
[ResourceExposure(ResourceScope.Machine)]
[ResourceConsumption(ResourceScope.Machine)]
private static FileStream OpenFile(String path, FileAccess access, out SafeFileHandle handle)
{
FileStream fs = new FileStream(path, FileMode.Open, access, FileShare.ReadWrite, 1);
handle = fs.SafeFileHandle;
if (handle.IsInvalid) {
// Return a meaningful error, using the RELATIVE path to
// the file to avoid returning extra information to the caller.
// NT5 oddity - when trying to open "C:\" as a FileStream,
// we usually get ERROR_PATH_NOT_FOUND from the OS. We should
// probably be consistent w/ every other directory.
int hr = Marshal.GetLastWin32Error();
String FullPath = Path.GetFullPathInternal(path);
if (hr==__Error.ERROR_PATH_NOT_FOUND && FullPath.Equals(Directory.GetDirectoryRoot(FullPath)))
hr = __Error.ERROR_ACCESS_DENIED;
__Error.WinIOError(hr, path);
}
return fs;
}
// Defined in WinError.h
private const int ERROR_INVALID_PARAMETER = 87;
private const int ERROR_ACCESS_DENIED = 0x5;
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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