Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CompMod / System / Diagnostics / TextWriterTraceListener.cs / 1305376 / TextWriterTraceListener.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Diagnostics { using System; using System.IO; using System.Text; using System.Security.Permissions; using System.Runtime.InteropServices; using System.IO.Ports; using Microsoft.Win32; using System.Runtime.Versioning; ////// [HostProtection(Synchronization=true)] public class TextWriterTraceListener : TraceListener { internal TextWriter writer; String fileName = null; ///Directs tracing or debugging output to /// a ///or to a , /// such as or . /// public TextWriterTraceListener() { } ///Initializes a new instance of the ///class with /// /// as the output recipient. /// public TextWriterTraceListener(Stream stream) : this(stream, string.Empty) { } ///Initializes a new instance of the ///class, using the /// stream as the recipient of the debugging and tracing output. /// public TextWriterTraceListener(Stream stream, string name) : base(name) { if (stream == null) throw new ArgumentNullException("stream"); this.writer = new StreamWriter(stream); } ///Initializes a new instance of the ///class with the /// specified name and using the stream as the recipient of the debugging and tracing output. /// public TextWriterTraceListener(TextWriter writer) : this(writer, string.Empty) { } ///Initializes a new instance of the ///class using the /// specified writer as recipient of the tracing or debugging output. /// public TextWriterTraceListener(TextWriter writer, string name) : base(name) { if (writer == null) throw new ArgumentNullException("writer"); this.writer = writer; } ///Initializes a new instance of the ///class with the /// specified name and using the specified writer as recipient of the tracing or /// debugging /// output. /// [ResourceExposure(ResourceScope.Machine)] public TextWriterTraceListener(string fileName) { this.fileName = fileName; } ///[To be supplied.] ////// [ResourceExposure(ResourceScope.Machine)] public TextWriterTraceListener(string fileName, string name) : base(name) { this.fileName = fileName; } ///[To be supplied.] ////// public TextWriter Writer { get { EnsureWriter(); return writer; } set { writer = value; } } ///Indicates the text writer that receives the tracing /// or debugging output. ////// public override void Close() { if (writer != null) { try { writer.Close(); } catch (ObjectDisposedException) { } } writer = null; } ///Closes the ///so that it no longer /// receives tracing or debugging output. /// /// protected override void Dispose(bool disposing) { try { if (disposing) { this.Close(); } else { // clean up resources if (writer != null) try { writer.Close(); } catch (ObjectDisposedException) { } writer = null; } } finally { base.Dispose(disposing); } } ////// public override void Flush() { if (!EnsureWriter()) return; try { writer.Flush(); } catch (ObjectDisposedException) { } } ///Flushes the output buffer for the ///. /// public override void Write(string message) { if (!EnsureWriter()) return; if (NeedIndent) WriteIndent(); try { writer.Write(message); } catch (ObjectDisposedException) { } } ///Writes a message /// to this instance's ///. /// public override void WriteLine(string message) { if (!EnsureWriter()) return; if (NeedIndent) WriteIndent(); try { writer.WriteLine(message); NeedIndent = true; } catch (ObjectDisposedException) { } } private static Encoding GetEncodingWithFallback(Encoding encoding) { // Clone it and set the "?" replacement fallback Encoding fallbackEncoding = (Encoding)encoding.Clone(); fallbackEncoding.EncoderFallback = EncoderFallback.ReplacementFallback; fallbackEncoding.DecoderFallback = DecoderFallback.ReplacementFallback; return fallbackEncoding; } // This uses a machine resource, scoped by the fileName variable. [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] internal bool EnsureWriter() { bool ret = true; if (writer == null) { ret = false; if (fileName == null) return ret; // StreamWriter by default uses UTF8Encoding which will throw on invalid encoding errors. // This can cause the internal StreamWriter's state to be irrecoverable. It is bad for tracing // APIs to throw on encoding errors. Instead, we should provide a "?" replacement fallback // encoding to substitute illegal chars. For ex, In case of high surrogate character // D800-DBFF without a following low surrogate character DC00-DFFF // NOTE: We also need to use an encoding that does't emit BOM whic is StreamWriter's default Encoding noBOMwithFallback = GetEncodingWithFallback(new UTF8Encoding(false)); // To support multiple appdomains/instances tracing to the same file, // we will try to open the given file for append but if we encounter // IO errors, we will prefix the file name with a unique GUID value // and try one more time string fullPath = Path.GetFullPath(fileName); string dirPath = Path.GetDirectoryName(fullPath); string fileNameOnly = Path.GetFileName(fullPath); for (int i=0; i<2; i++) { try { writer = new StreamWriter(fullPath, true, noBOMwithFallback, 4096); ret = true; break; } catch (IOException ) { // Should we do this only for ERROR_SHARING_VIOLATION? //if (InternalResources.MakeErrorCodeFromHR(Marshal.GetHRForException(ioexc)) == InternalResources.ERROR_SHARING_VIOLATION) { fileNameOnly = Guid.NewGuid().ToString() + fileNameOnly; fullPath = Path.Combine(dirPath, fileNameOnly); continue; } catch (UnauthorizedAccessException ) { //ERROR_ACCESS_DENIED, mostly ACL issues break; } catch (Exception ) { break; } } if (!ret) { // Disable tracing to this listener. Every Write will be nop. // We need to think of a central way to deal with the listener // init errors in the future. The default should be that we eat // up any errors from listener and optionally notify the user fileName = null; } } return ret; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //Writes a message /// to this instance's ///followed by a line terminator. The /// default line terminator is a carriage return followed by a line feed (\r\n). // Copyright (c) Microsoft Corporation. All rights reserved. // //----------------------------------------------------------------------------- /* */ namespace System.Diagnostics { using System; using System.IO; using System.Text; using System.Security.Permissions; using System.Runtime.InteropServices; using System.IO.Ports; using Microsoft.Win32; using System.Runtime.Versioning; ////// [HostProtection(Synchronization=true)] public class TextWriterTraceListener : TraceListener { internal TextWriter writer; String fileName = null; ///Directs tracing or debugging output to /// a ///or to a , /// such as or . /// public TextWriterTraceListener() { } ///Initializes a new instance of the ///class with /// /// as the output recipient. /// public TextWriterTraceListener(Stream stream) : this(stream, string.Empty) { } ///Initializes a new instance of the ///class, using the /// stream as the recipient of the debugging and tracing output. /// public TextWriterTraceListener(Stream stream, string name) : base(name) { if (stream == null) throw new ArgumentNullException("stream"); this.writer = new StreamWriter(stream); } ///Initializes a new instance of the ///class with the /// specified name and using the stream as the recipient of the debugging and tracing output. /// public TextWriterTraceListener(TextWriter writer) : this(writer, string.Empty) { } ///Initializes a new instance of the ///class using the /// specified writer as recipient of the tracing or debugging output. /// public TextWriterTraceListener(TextWriter writer, string name) : base(name) { if (writer == null) throw new ArgumentNullException("writer"); this.writer = writer; } ///Initializes a new instance of the ///class with the /// specified name and using the specified writer as recipient of the tracing or /// debugging /// output. /// [ResourceExposure(ResourceScope.Machine)] public TextWriterTraceListener(string fileName) { this.fileName = fileName; } ///[To be supplied.] ////// [ResourceExposure(ResourceScope.Machine)] public TextWriterTraceListener(string fileName, string name) : base(name) { this.fileName = fileName; } ///[To be supplied.] ////// public TextWriter Writer { get { EnsureWriter(); return writer; } set { writer = value; } } ///Indicates the text writer that receives the tracing /// or debugging output. ////// public override void Close() { if (writer != null) { try { writer.Close(); } catch (ObjectDisposedException) { } } writer = null; } ///Closes the ///so that it no longer /// receives tracing or debugging output. /// /// protected override void Dispose(bool disposing) { try { if (disposing) { this.Close(); } else { // clean up resources if (writer != null) try { writer.Close(); } catch (ObjectDisposedException) { } writer = null; } } finally { base.Dispose(disposing); } } ////// public override void Flush() { if (!EnsureWriter()) return; try { writer.Flush(); } catch (ObjectDisposedException) { } } ///Flushes the output buffer for the ///. /// public override void Write(string message) { if (!EnsureWriter()) return; if (NeedIndent) WriteIndent(); try { writer.Write(message); } catch (ObjectDisposedException) { } } ///Writes a message /// to this instance's ///. /// public override void WriteLine(string message) { if (!EnsureWriter()) return; if (NeedIndent) WriteIndent(); try { writer.WriteLine(message); NeedIndent = true; } catch (ObjectDisposedException) { } } private static Encoding GetEncodingWithFallback(Encoding encoding) { // Clone it and set the "?" replacement fallback Encoding fallbackEncoding = (Encoding)encoding.Clone(); fallbackEncoding.EncoderFallback = EncoderFallback.ReplacementFallback; fallbackEncoding.DecoderFallback = DecoderFallback.ReplacementFallback; return fallbackEncoding; } // This uses a machine resource, scoped by the fileName variable. [ResourceExposure(ResourceScope.None)] [ResourceConsumption(ResourceScope.Machine, ResourceScope.Machine)] internal bool EnsureWriter() { bool ret = true; if (writer == null) { ret = false; if (fileName == null) return ret; // StreamWriter by default uses UTF8Encoding which will throw on invalid encoding errors. // This can cause the internal StreamWriter's state to be irrecoverable. It is bad for tracing // APIs to throw on encoding errors. Instead, we should provide a "?" replacement fallback // encoding to substitute illegal chars. For ex, In case of high surrogate character // D800-DBFF without a following low surrogate character DC00-DFFF // NOTE: We also need to use an encoding that does't emit BOM whic is StreamWriter's default Encoding noBOMwithFallback = GetEncodingWithFallback(new UTF8Encoding(false)); // To support multiple appdomains/instances tracing to the same file, // we will try to open the given file for append but if we encounter // IO errors, we will prefix the file name with a unique GUID value // and try one more time string fullPath = Path.GetFullPath(fileName); string dirPath = Path.GetDirectoryName(fullPath); string fileNameOnly = Path.GetFileName(fullPath); for (int i=0; i<2; i++) { try { writer = new StreamWriter(fullPath, true, noBOMwithFallback, 4096); ret = true; break; } catch (IOException ) { // Should we do this only for ERROR_SHARING_VIOLATION? //if (InternalResources.MakeErrorCodeFromHR(Marshal.GetHRForException(ioexc)) == InternalResources.ERROR_SHARING_VIOLATION) { fileNameOnly = Guid.NewGuid().ToString() + fileNameOnly; fullPath = Path.Combine(dirPath, fileNameOnly); continue; } catch (UnauthorizedAccessException ) { //ERROR_ACCESS_DENIED, mostly ACL issues break; } catch (Exception ) { break; } } if (!ret) { // Disable tracing to this listener. Every Write will be nop. // We need to think of a central way to deal with the listener // init errors in the future. The default should be that we eat // up any errors from listener and optionally notify the user fileName = null; } } return ret; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.Writes a message /// to this instance's ///followed by a line terminator. The /// default line terminator is a carriage return followed by a line feed (\r\n).
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- WebSysDefaultValueAttribute.cs
- StatusBarDrawItemEvent.cs
- Util.cs
- MDIWindowDialog.cs
- BindMarkupExtensionSerializer.cs
- DomNameTable.cs
- TextEditorThreadLocalStore.cs
- ScriptMethodAttribute.cs
- Tablet.cs
- ResourceDescriptionAttribute.cs
- CheckPair.cs
- TreeNode.cs
- BindingEntityInfo.cs
- Accessible.cs
- RectangleGeometry.cs
- SearchExpression.cs
- ColorTransformHelper.cs
- unsafenativemethodsother.cs
- ZipArchive.cs
- ReadingWritingEntityEventArgs.cs
- SynchronizedInputPattern.cs
- WebHttpBindingCollectionElement.cs
- PersonalizationAdministration.cs
- WhiteSpaceTrimStringConverter.cs
- HTMLTextWriter.cs
- DataGridHeaderBorder.cs
- ViewBase.cs
- HtmlPhoneCallAdapter.cs
- HttpProtocolReflector.cs
- CacheMemory.cs
- WeakRefEnumerator.cs
- NetworkStream.cs
- ReferencedCollectionType.cs
- SelectionPattern.cs
- ProtocolsSection.cs
- ItemDragEvent.cs
- TypePresenter.xaml.cs
- TargetParameterCountException.cs
- SystemDiagnosticsSection.cs
- PreservationFileReader.cs
- ConnectionConsumerAttribute.cs
- MetadataItemCollectionFactory.cs
- SapiGrammar.cs
- StdValidatorsAndConverters.cs
- DataControlButton.cs
- BufferedStream2.cs
- MsmqHostedTransportManager.cs
- CustomPopupPlacement.cs
- DesignTimeResourceProviderFactoryAttribute.cs
- ToolTipService.cs
- WinFormsSecurity.cs
- LinkConverter.cs
- TypeNameParser.cs
- DependencyPropertyConverter.cs
- QilGenerator.cs
- altserialization.cs
- Int32CAMarshaler.cs
- KeyNotFoundException.cs
- DetailsViewDeletedEventArgs.cs
- NativeConfigurationLoader.cs
- XLinq.cs
- ChannelTokenTypeConverter.cs
- XmlSerializerObjectSerializer.cs
- InkCanvasFeedbackAdorner.cs
- NetWebProxyFinder.cs
- HttpListener.cs
- SharedUtils.cs
- _UncName.cs
- SqlDependencyListener.cs
- UTF32Encoding.cs
- ChtmlFormAdapter.cs
- SatelliteContractVersionAttribute.cs
- MenuItem.cs
- TripleDESCryptoServiceProvider.cs
- LongTypeConverter.cs
- XXXOnTypeBuilderInstantiation.cs
- WsdlParser.cs
- RefreshInfo.cs
- xdrvalidator.cs
- BindableAttribute.cs
- FrameworkElementAutomationPeer.cs
- PageContentAsyncResult.cs
- ColorConvertedBitmap.cs
- SID.cs
- UserControlParser.cs
- log.cs
- DirectoryRootQuery.cs
- GraphicsContainer.cs
- PriorityChain.cs
- CrossSiteScriptingValidation.cs
- SamlDelegatingWriter.cs
- CachedBitmap.cs
- QueuedDeliveryRequirementsMode.cs
- AlternationConverter.cs
- ToolTip.cs
- _DisconnectOverlappedAsyncResult.cs
- PagesSection.cs
- ReceiveMessageRecord.cs
- ComplexBindingPropertiesAttribute.cs
- AssemblyBuilder.cs