Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / Design / Util / TemporaryBitmapFile.cs / 1305376 / TemporaryBitmapFile.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- namespace System.Web.UI.Design.MobileControls.Util { using System; using System.Diagnostics; using System.Drawing; using System.Drawing.Imaging; using System.IO; ////// This class encapsulates a bitmap and a file that represents /// the bitmap on disk. It would have been cleaner to subclass /// bitmap, but the bitmap class is sealed. /// [ System.Security.Permissions.SecurityPermission(System.Security.Permissions.SecurityAction.Demand, Flags=System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode) ] [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")] internal class TemporaryBitmapFile : IDisposable { private String _path; private Bitmap _bitmap; internal TemporaryBitmapFile(Bitmap bitmap) { Debug.Assert(bitmap != null, "You must provide a valid bitmap object." ); _bitmap = bitmap; _path = Path.GetTempPath() + Guid.NewGuid().ToString() + ".bmp"; [....](); } public void Dispose() { if(_bitmap != null) { _bitmap.Dispose(); _bitmap = null; } if(_path != null) { FileAttributes fa = File.GetAttributes(_path); File.SetAttributes(_path, fa & ~FileAttributes.ReadOnly); File.Delete(_path); _path = null; } } private void [....]() { FileAttributes fa; if(File.Exists(_path)) { fa = File.GetAttributes(_path); File.SetAttributes(_path, fa & ~FileAttributes.ReadOnly); } _bitmap.Save(_path, ImageFormat.Bmp); // If the file did not exist previously, fa will not be valid. fa = File.GetAttributes(_path); File.SetAttributes(_path, fa | FileAttributes.ReadOnly); } internal String Url { get { return "file:///" + _path; } } internal Bitmap UnderlyingBitmap { get { return _bitmap; } set { Debug.Assert(value != null, "Do not set UnderlyingBitmap to null. Instead, "+ "dispose of this object and create a new one later if " + "neccessary. (A zero sized bmp can not be written to disk)" ); if(_bitmap != null) { _bitmap.Dispose(); } _bitmap = value; [....](); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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