OpenFileDialog.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / OpenFileDialog.cs / 2 / OpenFileDialog.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms 
{ 

    using System.Diagnostics; 

    using System;
    using System.Diagnostics.CodeAnalysis;
    using System.Drawing; 
    using CodeAccessPermission = System.Security.CodeAccessPermission;
    using System.Security.Permissions; 
    using System.IO; 
    using System.ComponentModel;
    using Microsoft.Win32; 

    /// 
    /// 
    ///     
    ///       Represents a common dialog box
    ///       that displays the control that allows the user to open a file. This class 
    ///       cannot be inherited. 
    ///    
    ///  
    [SRDescription(SR.DescriptionOpenFileDialog)]
    public sealed class OpenFileDialog : FileDialog
    {
 
        /// 
        ///  
        ///     
        ///       Gets or sets a value indicating whether the dialog box displays a
        ///       warning if the user specifies a file name that does not exist. 
        ///    
        /// 
        [
        DefaultValue(true), 
        SRDescription(SR.OFDcheckFileExistsDescr)
        ] 
        public override bool CheckFileExists 
        {
            get 
            {
                return base.CheckFileExists;
            }
            set 
            {
                base.CheckFileExists = value; 
            } 
        }
 
        /// 
        /// 
        ///    
        ///       Gets or sets a value 
        ///       indicating whether the dialog box allows multiple files to be selected.
        ///     
        ///  
        [
        SRCategory(SR.CatBehavior), 
        DefaultValue(false),
        SRDescription(SR.OFDmultiSelectDescr)
        ]
        public bool Multiselect 
        {
            get 
            { 
                return GetOption(NativeMethods.OFN_ALLOWMULTISELECT);
            } 
            set
            {
                SetOption(NativeMethods.OFN_ALLOWMULTISELECT, value);
            } 
        }
 
        ///  
        /// 
        ///     
        ///       Gets or sets a value indicating whether
        ///       the read-only check box is selected.
        ///    
        ///  
        [
        SRCategory(SR.CatBehavior), 
        DefaultValue(false), 
        SRDescription(SR.OFDreadOnlyCheckedDescr)
        ] 
        public bool ReadOnlyChecked
        {
            get
            { 
                return GetOption(NativeMethods.OFN_READONLY);
            } 
            set 
            {
                SetOption(NativeMethods.OFN_READONLY, value); 
            }
        }

        ///  
        /// 
        ///     
        ///       Gets or sets a value indicating whether the dialog contains a read-only check box. 
        ///    
        ///  
        [
        SRCategory(SR.CatBehavior),
        DefaultValue(false),
        SRDescription(SR.OFDshowReadOnlyDescr) 
        ]
        public bool ShowReadOnly 
        { 
            get
            { 
                return !GetOption(NativeMethods.OFN_HIDEREADONLY);
            }
            set
            { 
                SetOption(NativeMethods.OFN_HIDEREADONLY, !value);
            } 
        } 

        ///  
        /// 
        ///    
        ///       Opens the file selected by the user with read-only permission.  The file
        ///       attempted is specified by the  property. 
        ///    
        ///  
        [SuppressMessage("Microsoft.Usage", "CA2208:InstantiateArgumentExceptionsCorrectly")] 
        /// SECREVIEW: ReviewImperativeSecurity
        ///   vulnerability to watch out for: A method uses imperative security and might be constructing the permission using state information or return values that can change while the demand is active. 
        ///   reason for exclude: filename is snapped directly at the beginning of the function.
        [SuppressMessage("Microsoft.Security", "CA2103:ReviewImperativeSecurity")]
        public Stream OpenFile()
        { 
            Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogOpenFile Demanded");
            IntSecurity.FileDialogOpenFile.Demand(); 
 
            string filename = FileNamesInternal[0];
 
            if (filename == null || (filename.Length == 0))
                throw new ArgumentNullException("FileName");

            Stream s = null; 

            // SECREVIEW : We demanded the FileDialog permission above, so it is safe 
            //           : to assert this here. Since the user picked the file, it 
            //           : is OK to give them readonly access to the stream.
            // 
            new FileIOPermission(FileIOPermissionAccess.Read, IntSecurity.UnsafeGetFullPath(filename)).Assert();
            try
            {
                s = new FileStream(filename, FileMode.Open, FileAccess.Read, FileShare.Read); 
            }
            finally 
            { 
                CodeAccessPermission.RevertAssert();
            } 
            return s;
        }

        ///  
        /// 
        ///     
        ///       Resets all properties to their default values. 
        ///    
        ///  
        public override void Reset()
        {
            base.Reset();
            SetOption(NativeMethods.OFN_FILEMUSTEXIST, true); 
        }
 
        internal override void EnsureFileDialogPermission() 
        {
            Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogOpenFile Demanded in OpenFileDialog.RunFileDialog"); 
            IntSecurity.FileDialogOpenFile.Demand();
        }

        ///  
        /// 
        ///     Displays a file open dialog. 
        ///  
        /// 
        internal override bool RunFileDialog(NativeMethods.OPENFILENAME_I ofn) 
        {
            //We have already done the demand in EnsureFileDialogPermission but it doesn't hurt to do it again
            Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogOpenFile Demanded in OpenFileDialog.RunFileDialog");
            IntSecurity.FileDialogOpenFile.Demand(); 

            bool result = UnsafeNativeMethods.GetOpenFileName(ofn); 
            if (!result) 
            {
                // Something may have gone wrong - check for error condition 
                //
                int errorCode = SafeNativeMethods.CommDlgExtendedError();
                switch (errorCode)
                { 
                    case NativeMethods.FNERR_INVALIDFILENAME:
                        throw new InvalidOperationException(SR.GetString(SR.FileDialogInvalidFileName, FileName)); 
 
                    case NativeMethods.FNERR_SUBCLASSFAILURE:
                        throw new InvalidOperationException(SR.GetString(SR.FileDialogSubLassFailure)); 

                    case NativeMethods.FNERR_BUFFERTOOSMALL:
                        throw new InvalidOperationException(SR.GetString(SR.FileDialogBufferTooSmall));
                } 
            }
            return result; 
        } 

        internal override string[] ProcessVistaFiles(FileDialogNative.IFileDialog dialog) 
        {
            FileDialogNative.IFileOpenDialog openDialog = (FileDialogNative.IFileOpenDialog)dialog;
            if (Multiselect)
            { 
                FileDialogNative.IShellItemArray results;
                openDialog.GetResults(out results); 
                uint count; 
                results.GetCount(out count);
                string[] files = new string[count]; 
                for (uint i = 0; i < count; ++i)
                {
                    FileDialogNative.IShellItem item;
                    results.GetItemAt(i, out item); 
                    files[unchecked((int)i)] = GetFilePathFromShellItem(item);
                } 
                return files; 
            }
            else 
            {
                FileDialogNative.IShellItem item;
                openDialog.GetResult(out item);
                return new string[] { GetFilePathFromShellItem(item) }; 
            }
        } 
 
        internal override FileDialogNative.IFileDialog CreateVistaDialog()
        { 
            return new FileDialogNative.NativeFileOpenDialog();
        }

        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
            SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts") 
        ]
        public string SafeFileName 
        {
            get
            {
                new FileIOPermission(PermissionState.Unrestricted).Assert(); 
                string fullPath = FileName;
                CodeAccessPermission.RevertAssert(); 
                if (string.IsNullOrEmpty(fullPath)) 
                {
                    return ""; 
                }

                string safePath = RemoveSensitivePathInformation(fullPath);
                return safePath; 
            }
        } 
 
        private static string RemoveSensitivePathInformation(string fullPath)
        { 
            return System.IO.Path.GetFileName(fullPath);
        }

        [ 
            Browsable(false),
            DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden), 
            SuppressMessage("Microsoft.Performance", "CA1819:PropertiesShouldNotReturnArrays"), 
            SuppressMessage("Microsoft.Security", "CA2106:SecureAsserts")
        ] 
        public string[] SafeFileNames
        {
            get
            { 
                new FileIOPermission(PermissionState.Unrestricted).Assert();
                string[] fullPaths = FileNames; 
                CodeAccessPermission.RevertAssert(); 
                if (null == fullPaths || 0 == fullPaths.Length)
                { return new string[0]; } 
                string[] safePaths = new string[fullPaths.Length];
                for (int i = 0; i < safePaths.Length; ++i)
                {
                    safePaths[i] = RemoveSensitivePathInformation(fullPaths[i]); 
                }
                return safePaths; 
            } 
        }
 
        internal override bool SettingsSupportVistaDialog
        {
            get
            { 
                return base.SettingsSupportVistaDialog && !this.ShowReadOnly;
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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