DirectoryInfo.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / IO / DirectoryInfo.cs / 1 / DirectoryInfo.cs
                        
                        
                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
/*============================================================
** 
** Class:  DirectoryInfo 
**
** 
** Purpose: Exposes routines for enumerating through a
** directory.
**
**          April 11,2000 
**
===========================================================*/ 
 
using System;
using System.Collections; 
using System.Security;
#if !FEATURE_PAL
using System.Security.AccessControl;
#endif 
using System.Security.Permissions;
using Microsoft.Win32; 
using System.Text; 
using System.Runtime.InteropServices;
using System.Globalization; 
using System.Runtime.Serialization;
using System.Runtime.Versioning;

namespace System.IO { 
    [Serializable]
    [ComVisible(true)] 
    public sealed class DirectoryInfo : FileSystemInfo { 
        private String[] demandDir;
 
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        public DirectoryInfo(String path)
        { 
            if (path==null)
                throw new ArgumentNullException("path"); 
 
            // Special case ":" to point to "" instead
            if ((path.Length == 2) && (path[1] == ':')) 
                OriginalPath = ".";
            else
                OriginalPath = path;
 
            // Must fully qualify the path for the security check
            String fullPath = Path.GetFullPathInternal(path); 
 
            demandDir = new String[] {Directory.GetDemandDir(fullPath, true)};
            new FileIOPermission(FileIOPermissionAccess.Read, demandDir, false, false ).Demand(); 

            FullPath = fullPath;
        }
 
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)] 
        internal DirectoryInfo(String fullPath, bool junk) 
        {
            BCLDebug.Assert(Path.GetRootLength(fullPath) > 0, "fullPath must be fully qualified!"); 
            // Fast path when we know a DirectoryInfo exists.
            OriginalPath = Path.GetFileName(fullPath);
            FullPath = fullPath;
            demandDir = new String[] {Directory.GetDemandDir(fullPath, true)}; 
        }
 
        private DirectoryInfo(SerializationInfo info, StreamingContext context) : base(info, context) 
        {
            demandDir = new String[] {Directory.GetDemandDir(FullPath, true)}; 
            new FileIOPermission(FileIOPermissionAccess.Read, demandDir, false, false ).Demand();
        }

        public override String Name { 
            [ResourceExposure(ResourceScope.Machine)]
            [ResourceConsumption(ResourceScope.Machine)] 
            get { 
                // FullPath might be either "c:\bar" or "c:\bar\".  Handle
                // those cases, as well as avoiding mangling "c:\". 
                String s = FullPath;
                if (s.Length > 3) {
                    if (s.EndsWith(Path.DirectorySeparatorChar))
                        s = FullPath.Substring(0, FullPath.Length - 1); 
                    return Path.GetFileName(s);
                } 
                return FullPath;  // For rooted paths, like "c:\" 
            }
        } 

        public DirectoryInfo Parent {
            [ResourceExposure(ResourceScope.Machine)]
            [ResourceConsumption(ResourceScope.Machine)] 
            get {
                String parentName; 
                // FullPath might be either "c:\bar" or "c:\bar\".  Handle 
                // those cases, as well as avoiding mangling "c:\".
                String s = FullPath; 
                if (s.Length > 3 && s.EndsWith(Path.DirectorySeparatorChar))
                    s = FullPath.Substring(0, FullPath.Length - 1);
                parentName = Path.GetDirectoryName(s);
                if (parentName==null) 
                    return null;
                DirectoryInfo dir = new DirectoryInfo(parentName,false); 
                new FileIOPermission(FileIOPermissionAccess.PathDiscovery | FileIOPermissionAccess.Read, dir.demandDir, false, false).Demand(); 
                return dir;
            } 
        }


        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        public DirectoryInfo CreateSubdirectory(String path) { 
#if !FEATURE_PAL 
            return CreateSubdirectory(path, null);
        } 

        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        public DirectoryInfo CreateSubdirectory(String path, DirectorySecurity directorySecurity) { 
#endif
            if (path==null) 
                throw new ArgumentNullException("path"); 

            String newDirs = Path.InternalCombine(FullPath, path); 
            String fullPath = Path.GetFullPathInternal(newDirs);

            if (0!=String.Compare(FullPath,0,fullPath,0, FullPath.Length,StringComparison.OrdinalIgnoreCase)) {
                String displayPath = __Error.GetDisplayablePath(OriginalPath, false); 
                throw new ArgumentException(String.Format(CultureInfo.CurrentCulture, Environment.GetResourceString("Argument_InvalidSubPath"), path, displayPath));
            } 
 
            // Ensure we have permission to create this subdirectory.
            String demandDir = Directory.GetDemandDir(fullPath, true); 
            new FileIOPermission(FileIOPermissionAccess.Write, new String[] { demandDir }, false, false ).Demand();

#if !FEATURE_PAL
            Directory.InternalCreateDirectory(fullPath, path, directorySecurity); 
#else
            Directory.InternalCreateDirectory(fullPath, path); 
#endif 
            // Check for read permission to directory we hand back by calling this constructor.
            return new DirectoryInfo(fullPath); 
        }

        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] 
        public void Create()
        { 
#if !FEATURE_PAL 
            Directory.InternalCreateDirectory(FullPath, OriginalPath, null);
#else 
            Directory.InternalCreateDirectory(FullPath, OriginalPath);
#endif
        }
 
#if !FEATURE_PAL
        [ResourceExposure(ResourceScope.None)] 
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] 
        public void Create(DirectorySecurity directorySecurity)
        { 
            Directory.InternalCreateDirectory(FullPath, OriginalPath, directorySecurity);
        }
#endif
 
        // Tests if the given path refers to an existing DirectoryInfo on disk.
        // 
        // Your application must have Read permission to the directory's 
        // contents.
        // 
        public override bool Exists {
            get
            {
                try 
                {
                    if (_dataInitialised == -1) 
                        Refresh(); 
                    if (_dataInitialised != 0) // Refresh was unable to initialise the data
                        return false; 

                    return _data.fileAttributes != -1 && (_data.fileAttributes & Win32Native.FILE_ATTRIBUTE_DIRECTORY) != 0;
                }
                catch 
                {
                    return false; 
                } 
            }
        } 

#if !FEATURE_PAL
        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] 
        public DirectorySecurity GetAccessControl()
        { 
            return Directory.GetAccessControl(FullPath, AccessControlSections.Access | AccessControlSections.Owner | AccessControlSections.Group); 
        }
 
        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)]
        public DirectorySecurity GetAccessControl(AccessControlSections includeSections)
        { 
            return Directory.GetAccessControl(FullPath, includeSections);
        } 
 
        [ResourceExposure(ResourceScope.None)]
        [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] 
        public void SetAccessControl(DirectorySecurity directorySecurity)
        {
            Directory.SetAccessControl(FullPath, directorySecurity);
        } 
#endif
 
        // Returns an array of Files in the current DirectoryInfo matching the 
        // given search criteria (ie, "*.txt").
        [ResourceExposure(ResourceScope.Machine)] 
        [ResourceConsumption(ResourceScope.Machine)]
        public FileInfo[] GetFiles(String searchPattern)
        {
            return GetFiles(searchPattern, SearchOption.TopDirectoryOnly); 
        }
 
 
        // Converts the fully qualified user path returned by InternalGetFileDirectoryNames
        // into fullpath by combining the relevant portion of it with the fullpath of this directory 
        // For ex, converts  foo\bar.txt into 'c:\temp\foo\bar.txt', where FullPath is 'c:\temp\foo'
        // and OriginalPath (aka userpath) is 'foo'
        private string FixupFileDirFullPath(String fileDirUserPath)
        { 
            BCLDebug.Assert(fileDirUserPath != null,"InternalGetFileDirectoryNames returned paths should not be null!");
            BCLDebug.Assert(fileDirUserPath.StartsWith(OriginalPath, StringComparison.Ordinal),"InternalGetFileDirectoryNames returned paths should start with user path!"); 
 
            String fileDirFullPath;
 
            if (OriginalPath.Length == 0) {
                fileDirFullPath = Path.InternalCombine(FullPath, fileDirUserPath);
            }
            else if (OriginalPath.EndsWith(Path.DirectorySeparatorChar) || OriginalPath.EndsWith(Path.AltDirectorySeparatorChar)) { 
                BCLDebug.Assert((fileDirUserPath[OriginalPath.Length-1] == Path.DirectorySeparatorChar)
                                 || (fileDirUserPath[OriginalPath.Length-1] == Path.AltDirectorySeparatorChar),"InternalGetFileDirectoryNames returned incorrect user path!"); 
                fileDirFullPath = Path.InternalCombine(FullPath, fileDirUserPath.Substring(OriginalPath.Length)); 
            }
            else { 
                BCLDebug.Assert((fileDirUserPath[OriginalPath.Length] == Path.DirectorySeparatorChar),"InternalGetFileDirectoryNames returned incorrect user path!");
                fileDirFullPath = Path.InternalCombine(FullPath, fileDirUserPath.Substring(OriginalPath.Length + 1));
            }
 
            return fileDirFullPath;
        } 
 
        // Returns an array of Files in the current DirectoryInfo matching the
        // given search criteria (ie, "*.txt"). 
        [ResourceExposure(ResourceScope.Machine)]
        [ResourceConsumption(ResourceScope.Machine)]
        public FileInfo[] GetFiles(String searchPattern, SearchOption searchOption)
        { 
            if (searchPattern==null)
                throw new ArgumentNullException("searchPattern"); 
 
            String[] fileNames = Directory.InternalGetFileDirectoryNames(FullPath, OriginalPath, searchPattern, true, false, searchOption);
 
            // We need full path for permission check.
            // InternalGetFileDirectoryNames returns qualified user path,
            // i.e, path starts from OriginalPath. We need to convert this to fullpath.
            for (int i = 0; i < fileNames.Length; i++)  { 
                fileNames[i] = FixupFileDirFullPath(fileNames[i]);
            } 
 
            if (fileNames.Length != 0)
                new FileIOPermission(FileIOPermissionAccess.Read, fileNames, false, false).Demand(); 

            FileInfo[] files = new FileInfo[fileNames.Length];
            for(int i=0; i
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