SaveFileDialog.cs source code in C# .NET

                        Code:
                         / DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / WinForms / Managed / System / WinForms / SaveFileDialog.cs / 2 / SaveFileDialog.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Windows.Forms { 
 
    using System.Diagnostics;
 
    using System;
    using CodeAccessPermission = System.Security.CodeAccessPermission;
    using System.IO;
    using System.Drawing; 
    using System.Diagnostics.CodeAnalysis;
    using System.Security.Permissions; 
    using System.ComponentModel; 
    using System.Windows.Forms;
    using Microsoft.Win32; 


    /// 
    ///  
    ///    
    ///       Represents 
    ///       a common dialog box that allows the user to specify options for saving a 
    ///       file. This class cannot be inherited.
    ///     
    /// 
    [
    Designer("System.Windows.Forms.Design.SaveFileDialogDesigner, " + AssemblyRef.SystemDesign),
    SRDescription(SR.DescriptionSaveFileDialog) 
    ]
    public sealed class SaveFileDialog : FileDialog { 
 
        /// 
        ///  
        ///    
        ///       Gets or sets a value indicating whether the dialog box prompts the user for
        ///       permission to create a file if the user specifies a file that does not exist.
        ///     
        /// 
        [ 
        SRCategory(SR.CatBehavior), 
        DefaultValue(false),
        SRDescription(SR.SaveFileDialogCreatePrompt) 
        ]
        public bool CreatePrompt {
            get {
                return GetOption(NativeMethods.OFN_CREATEPROMPT); 
            }
            set { 
                Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogCustomization Demanded"); 
                IntSecurity.FileDialogCustomization.Demand();
                SetOption(NativeMethods.OFN_CREATEPROMPT, value); 
            }
        }

        ///  
        /// 
        ///     
        ///       Gets or sets a value indicating whether the Save As dialog box displays a warning if the user specifies 
        ///       a file name that already exists.
        ///     
        /// 
        [
        SRCategory(SR.CatBehavior),
        DefaultValue(true), 
        SRDescription(SR.SaveFileDialogOverWritePrompt)
        ] 
        public bool OverwritePrompt { 
            get {
                return GetOption(NativeMethods.OFN_OVERWRITEPROMPT); 
            }
            set {
                Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogCustomization Demanded");
                IntSecurity.FileDialogCustomization.Demand(); 
                SetOption(NativeMethods.OFN_OVERWRITEPROMPT, value);
            } 
        } 

        ///  
        /// 
        ///    
        ///       Opens the file with read/write permission selected by the user.
        ///     
        /// 
 
        [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 a local variable and not subject to race conditions.
        [SuppressMessage("Microsoft.Security", "CA2103:ReviewImperativeSecurity")]
        public Stream OpenFile() {
            Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogSaveFile Demanded"); 
            IntSecurity.FileDialogSaveFile.Demand();
 
            string filename = FileNamesInternal[0]; 

            if (string.IsNullOrEmpty(filename)) 
                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 read/write access to the stream. 
            //
            new FileIOPermission(FileIOPermissionAccess.AllAccess, IntSecurity.UnsafeGetFullPath(filename)).Assert(); 
            try {
                s = new FileStream(filename, FileMode.Create, FileAccess.ReadWrite);
            }
            finally { 
                CodeAccessPermission.RevertAssert();
            } 
            return s; 
        }
 
        /// 
        /// 
        ///    
        ///       Prompts the user with a  
        ///       when a file is about to be created. This method is
        ///       invoked when the CreatePrompt property is true and the specified file 
        ///       does not exist. A return value of false prevents the dialog from 
        ///       closing.
        ///     
        /// 
        private bool PromptFileCreate(string fileName)
        {
            return MessageBoxWithFocusRestore(SR.GetString(SR.FileDialogCreatePrompt, fileName), 
                    DialogCaption, MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
        } 
 
        /// 
        ///  
        ///    
        ///       Prompts the user when a file is about to be overwritten. This method is
        ///       invoked when the "overwritePrompt" property is true and the specified
        ///       file already exists. A return value of false prevents the dialog from 
        ///       closing.
        /// 
        ///     
        /// 
        private bool PromptFileOverwrite(string fileName) { 
            return MessageBoxWithFocusRestore(SR.GetString(SR.FileDialogOverwritePrompt, fileName),
                    DialogCaption, MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
        }
 
        // If it's necessary to throw up a "This file exists, are you sure?" kind of
        // MessageBox, here's where we do it. 
        // Return value is whether or not the user hit "okay". 
        internal override bool PromptUserIfAppropriate(string fileName) {
            if (!base.PromptUserIfAppropriate(fileName)) { 
                return false;
            }

            //Note: When we are using the Vista dialog mode we get two prompts (one from us and one from the OS) if we do this 
            if ((options & NativeMethods.OFN_OVERWRITEPROMPT) != 0 && FileExists(fileName) && !this.UseVistaDialogInternal) {
                if (!PromptFileOverwrite(fileName)) { 
                    return false; 
                }
            } 

            if ((options & NativeMethods.OFN_CREATEPROMPT) != 0 && !FileExists(fileName)) {
                if (!PromptFileCreate(fileName)) {
                    return false; 
                }
            } 
 
            return true;
        } 

        /// 
        /// 
        ///     
        ///       Resets all dialog box options to their default
        ///       values. 
        ///     
        /// 
        public override void Reset() { 
            base.Reset();
            SetOption(NativeMethods.OFN_OVERWRITEPROMPT, true);
        }
 
        internal override void EnsureFileDialogPermission()
        { 
            Debug.WriteLineIf(IntSecurity.SecurityDemand.TraceVerbose, "FileDialogSaveFile Demanded in SaveFileDialog.RunFileDialog"); 
            IntSecurity.FileDialogSaveFile.Demand();
        } 

        /// 
        /// 
        ///  
        /// 
        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, "FileDialogSaveFile Demanded in SaveFileDialog.RunFileDialog");
            IntSecurity.FileDialogSaveFile.Demand(); 

            bool result = UnsafeNativeMethods.GetSaveFileName(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));
                }
            }
 
            return result;
         } 
        internal override string[] ProcessVistaFiles(FileDialogNative.IFileDialog dialog) 
        {
            FileDialogNative.IFileSaveDialog saveDialog = (FileDialogNative.IFileSaveDialog)dialog; 
            FileDialogNative.IShellItem item;
            dialog.GetResult(out item);
            return new string[] { GetFilePathFromShellItem(item) };
        } 
        internal override FileDialogNative.IFileDialog CreateVistaDialog()
        { return new FileDialogNative.NativeFileSaveDialog(); } 
 

    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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SaveFileDialog.cs source code in C# .NET

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