Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / xsp / System / Web / Util / FileEnumerator.cs / 1 / FileEnumerator.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * FileEnumerator class * * Copyright (c) 2003 Microsoft Corporation * * Class to efficiently enumerate the files in a directory. The only thing the framework provides * to do this is Directory.GetFiles(), which is unusable on large directories because it returns an * array containing all the file names at once (huge memory allocation). * * An efficient alternative is to use FindFirstFile/FindNextFile, which works but requires a lot * more code. Also, it makes our code base harder to port to non-windows platforms. * * This FileEnumerator class solves both problem, by providing a simple and efficient wrapper. * By working with a single object, it is almost as efficient as calling FindFirstFile/FindNextFile, * but is much easier to use. e.g. instead of: * * UnsafeNativeMethods.WIN32_FIND_DATA wfd; * IntPtr hFindFile = UnsafeNativeMethods.FindFirstFile(physicalDir + @"\*.*", out wfd); * * if (hFindFile == INVALID_HANDLE_VALUE) * return; * * try { * for (bool more=true; more; more=UnsafeNativeMethods.FindNextFile(hFindFile, out wfd)) { * * // Skip false directories * if (wfd.cFileName == "." || wfd.cFileName == "..") * continue; * * string fullPath = Path.Combine(physicalDir, wfd.cFileName); * * ProcessFile(fullPath); * } * } * finally { * UnsafeNativeMethods.FindClose(hFindFile); * } * * we can simply write * * foreach (FileData fileData in FileEnumerator.Create(physicalDir)) { * ProcessFile(fileData.FullName); * } */ namespace System.Web.Util { using System.IO; using System.Collections; /* * This is a somewhat artificial base class for FileEnumerator. The main reason * for it is to allow user code to be more readable, by looking like: * foreach (FileData fileData in FileEnumerator.Create(path)) { ... } * instead of * foreach (FileEnumerator fileData in FileEnumerator.Create(path)) { ... } */ internal abstract class FileData { protected string _path; protected UnsafeNativeMethods.WIN32_FIND_DATA _wfd; internal string Name { get { return _wfd.cFileName; } } internal string FullName { get { return _path + @"\" + _wfd.cFileName; } } internal bool IsDirectory { get { return (_wfd.dwFileAttributes & UnsafeNativeMethods.FILE_ATTRIBUTE_DIRECTORY) != 0; } } internal bool IsHidden { get { return (_wfd.dwFileAttributes & UnsafeNativeMethods.FILE_ATTRIBUTE_HIDDEN) != 0; } } internal FindFileData GetFindFileData() { return new FindFileData(ref _wfd); } } internal class FileEnumerator: FileData, IEnumerable, IEnumerator, IDisposable { private IntPtr _hFindFile = UnsafeNativeMethods.INVALID_HANDLE_VALUE; internal static FileEnumerator Create(string path) { return new FileEnumerator(path); } private FileEnumerator(string path) { _path = Path.GetFullPath(path); } ~FileEnumerator() { ((IDisposable)this).Dispose(); } // Should the current file be excluded from the enumeration private bool SkipCurrent() { // Skip false directories if (_wfd.cFileName == "." || _wfd.cFileName == "..") return true; return false; } // We just return ourselves for the enumerator, to avoid creating a new object IEnumerator IEnumerable.GetEnumerator() { return this; } bool IEnumerator.MoveNext() { for (;;) { if (_hFindFile == UnsafeNativeMethods.INVALID_HANDLE_VALUE) { _hFindFile = UnsafeNativeMethods.FindFirstFile(_path + @"\*.*", out _wfd); // Empty enumeration case if (_hFindFile == UnsafeNativeMethods.INVALID_HANDLE_VALUE) return false; } else { bool hasMoreFiles = UnsafeNativeMethods.FindNextFile(_hFindFile, out _wfd); if (!hasMoreFiles) return false; } if (!SkipCurrent()) return true; } } // The current object of the enumeration is always ourselves. No new object created. object IEnumerator.Current { get { return this; } } void IEnumerator.Reset() { // We don't support reset, though it would be easy to add if needed throw new InvalidOperationException(); } void IDisposable.Dispose() { if (_hFindFile != UnsafeNativeMethods.INVALID_HANDLE_VALUE) { UnsafeNativeMethods.FindClose(_hFindFile); _hFindFile = UnsafeNativeMethods.INVALID_HANDLE_VALUE; } System.GC.SuppressFinalize(this); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* * FileEnumerator class * * Copyright (c) 2003 Microsoft Corporation * * Class to efficiently enumerate the files in a directory. The only thing the framework provides * to do this is Directory.GetFiles(), which is unusable on large directories because it returns an * array containing all the file names at once (huge memory allocation). * * An efficient alternative is to use FindFirstFile/FindNextFile, which works but requires a lot * more code. Also, it makes our code base harder to port to non-windows platforms. * * This FileEnumerator class solves both problem, by providing a simple and efficient wrapper. * By working with a single object, it is almost as efficient as calling FindFirstFile/FindNextFile, * but is much easier to use. e.g. instead of: * * UnsafeNativeMethods.WIN32_FIND_DATA wfd; * IntPtr hFindFile = UnsafeNativeMethods.FindFirstFile(physicalDir + @"\*.*", out wfd); * * if (hFindFile == INVALID_HANDLE_VALUE) * return; * * try { * for (bool more=true; more; more=UnsafeNativeMethods.FindNextFile(hFindFile, out wfd)) { * * // Skip false directories * if (wfd.cFileName == "." || wfd.cFileName == "..") * continue; * * string fullPath = Path.Combine(physicalDir, wfd.cFileName); * * ProcessFile(fullPath); * } * } * finally { * UnsafeNativeMethods.FindClose(hFindFile); * } * * we can simply write * * foreach (FileData fileData in FileEnumerator.Create(physicalDir)) { * ProcessFile(fileData.FullName); * } */ namespace System.Web.Util { using System.IO; using System.Collections; /* * This is a somewhat artificial base class for FileEnumerator. The main reason * for it is to allow user code to be more readable, by looking like: * foreach (FileData fileData in FileEnumerator.Create(path)) { ... } * instead of * foreach (FileEnumerator fileData in FileEnumerator.Create(path)) { ... } */ internal abstract class FileData { protected string _path; protected UnsafeNativeMethods.WIN32_FIND_DATA _wfd; internal string Name { get { return _wfd.cFileName; } } internal string FullName { get { return _path + @"\" + _wfd.cFileName; } } internal bool IsDirectory { get { return (_wfd.dwFileAttributes & UnsafeNativeMethods.FILE_ATTRIBUTE_DIRECTORY) != 0; } } internal bool IsHidden { get { return (_wfd.dwFileAttributes & UnsafeNativeMethods.FILE_ATTRIBUTE_HIDDEN) != 0; } } internal FindFileData GetFindFileData() { return new FindFileData(ref _wfd); } } internal class FileEnumerator: FileData, IEnumerable, IEnumerator, IDisposable { private IntPtr _hFindFile = UnsafeNativeMethods.INVALID_HANDLE_VALUE; internal static FileEnumerator Create(string path) { return new FileEnumerator(path); } private FileEnumerator(string path) { _path = Path.GetFullPath(path); } ~FileEnumerator() { ((IDisposable)this).Dispose(); } // Should the current file be excluded from the enumeration private bool SkipCurrent() { // Skip false directories if (_wfd.cFileName == "." || _wfd.cFileName == "..") return true; return false; } // We just return ourselves for the enumerator, to avoid creating a new object IEnumerator IEnumerable.GetEnumerator() { return this; } bool IEnumerator.MoveNext() { for (;;) { if (_hFindFile == UnsafeNativeMethods.INVALID_HANDLE_VALUE) { _hFindFile = UnsafeNativeMethods.FindFirstFile(_path + @"\*.*", out _wfd); // Empty enumeration case if (_hFindFile == UnsafeNativeMethods.INVALID_HANDLE_VALUE) return false; } else { bool hasMoreFiles = UnsafeNativeMethods.FindNextFile(_hFindFile, out _wfd); if (!hasMoreFiles) return false; } if (!SkipCurrent()) return true; } } // The current object of the enumeration is always ourselves. No new object created. object IEnumerator.Current { get { return this; } } void IEnumerator.Reset() { // We don't support reset, though it would be easy to add if needed throw new InvalidOperationException(); } void IDisposable.Dispose() { if (_hFindFile != UnsafeNativeMethods.INVALID_HANDLE_VALUE) { UnsafeNativeMethods.FindClose(_hFindFile); _hFindFile = UnsafeNativeMethods.INVALID_HANDLE_VALUE; } System.GC.SuppressFinalize(this); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- CustomUserNameSecurityTokenAuthenticator.cs
- RegisteredDisposeScript.cs
- StatusBarItem.cs
- BroadcastEventHelper.cs
- DateTimeOffset.cs
- TypefaceMetricsCache.cs
- ActionItem.cs
- BindingCompleteEventArgs.cs
- BookmarkList.cs
- ExpandedWrapper.cs
- RecognizedAudio.cs
- BitmapEffectInput.cs
- EditorBrowsableAttribute.cs
- SplitContainer.cs
- CodeCompileUnit.cs
- Accessors.cs
- ShimAsPublicXamlType.cs
- GenericAuthenticationEventArgs.cs
- InternalCache.cs
- PinnedBufferMemoryStream.cs
- InstanceView.cs
- WindowManager.cs
- SynchronousChannel.cs
- ComboBox.cs
- DatatypeImplementation.cs
- BlockExpression.cs
- OledbConnectionStringbuilder.cs
- Aggregates.cs
- TypefaceMetricsCache.cs
- RijndaelManaged.cs
- keycontainerpermission.cs
- HttpCacheVary.cs
- FocusWithinProperty.cs
- RowVisual.cs
- IgnoreSectionHandler.cs
- URIFormatException.cs
- diagnosticsswitches.cs
- XmlCharacterData.cs
- TrackingServices.cs
- AppDomainManager.cs
- XmlMtomReader.cs
- CorrelationQueryBehavior.cs
- counter.cs
- filewebrequest.cs
- Point3DCollectionConverter.cs
- SecurityKeyType.cs
- Point3DAnimation.cs
- GridView.cs
- ObjectDataSourceStatusEventArgs.cs
- TextModifierScope.cs
- PageParser.cs
- CellTreeSimplifier.cs
- SegmentInfo.cs
- RequestNavigateEventArgs.cs
- Number.cs
- LocalizabilityAttribute.cs
- ApplicationFileCodeDomTreeGenerator.cs
- PtsContext.cs
- SmtpTransport.cs
- DocumentXPathNavigator.cs
- InvalidProgramException.cs
- SynchronizationLockException.cs
- SqlRowUpdatingEvent.cs
- DesignerForm.cs
- IdentityModelDictionary.cs
- DataPagerFieldItem.cs
- ZipIOExtraFieldElement.cs
- SelectionItemProviderWrapper.cs
- HttpMethodAttribute.cs
- CacheAxisQuery.cs
- ExpressionEvaluator.cs
- DataSourceXmlTextReader.cs
- AudioFormatConverter.cs
- DBCSCodePageEncoding.cs
- RoleServiceManager.cs
- ParameterElement.cs
- _AutoWebProxyScriptEngine.cs
- StringAnimationBase.cs
- RemotingServices.cs
- SendKeys.cs
- ValidateNames.cs
- EventWaitHandleSecurity.cs
- ZoneButton.cs
- AppDomainFactory.cs
- SqlTrackingQuery.cs
- DataGridViewLayoutData.cs
- EventManager.cs
- RadioButtonRenderer.cs
- FilteredReadOnlyMetadataCollection.cs
- WebBrowserUriTypeConverter.cs
- CopyAction.cs
- EncoderNLS.cs
- IsolatedStorageFilePermission.cs
- DBDataPermission.cs
- HotSpotCollection.cs
- UniqueIdentifierService.cs
- LinkArea.cs
- ClientBuildManagerCallback.cs
- ApplicationServiceHelper.cs
- InputScopeConverter.cs