Code:
/ 4.0 / 4.0 / untmp / 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).
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ChangePasswordDesigner.cs
- XmlILOptimizerVisitor.cs
- ManagementInstaller.cs
- SQLSingle.cs
- SynchronizationContext.cs
- Int32Storage.cs
- DelegatedStream.cs
- BaseDataListPage.cs
- LinearGradientBrush.cs
- DataGridRow.cs
- CodeDOMProvider.cs
- CodeDomLoader.cs
- XmlSchemaImporter.cs
- CssClassPropertyAttribute.cs
- SafeMILHandleMemoryPressure.cs
- SingleObjectCollection.cs
- EasingKeyFrames.cs
- QilTernary.cs
- CRYPTPROTECT_PROMPTSTRUCT.cs
- LightweightEntityWrapper.cs
- NullableDoubleAverageAggregationOperator.cs
- ConfigurationPropertyAttribute.cs
- HttpBrowserCapabilitiesWrapper.cs
- CollectionViewGroupInternal.cs
- DiagnosticEventProvider.cs
- GeometryDrawing.cs
- RegexGroupCollection.cs
- PenThread.cs
- DesignTimeData.cs
- FixedNode.cs
- ActivityExecutorDelegateInfo.cs
- Documentation.cs
- BasicViewGenerator.cs
- PrintDialogException.cs
- DbConnectionPoolOptions.cs
- ToolboxItemAttribute.cs
- ItemContainerGenerator.cs
- FlowDocumentPaginator.cs
- TraceUtils.cs
- DocumentViewerConstants.cs
- AutomationPatternInfo.cs
- EntityConnection.cs
- WmlTextBoxAdapter.cs
- ServiceDescriptionReflector.cs
- PromptBuilder.cs
- SHA256Managed.cs
- TransformerInfo.cs
- EqualityArray.cs
- ReferenceConverter.cs
- TreeNodeBinding.cs
- SqlXml.cs
- ObjectTag.cs
- ItemMap.cs
- LinkArea.cs
- BinaryMessageEncoder.cs
- WebDisplayNameAttribute.cs
- Point3DAnimationUsingKeyFrames.cs
- ReceiveDesigner.xaml.cs
- BindingListCollectionView.cs
- _SslState.cs
- StickyNoteContentControl.cs
- ValidationError.cs
- GridViewHeaderRowPresenter.cs
- updatecommandorderer.cs
- UInt64Converter.cs
- ActiveXHost.cs
- DataRowChangeEvent.cs
- TraceContextEventArgs.cs
- OleDbReferenceCollection.cs
- TreeViewHitTestInfo.cs
- MemberDescriptor.cs
- SessionIDManager.cs
- AsymmetricKeyExchangeFormatter.cs
- GeometryConverter.cs
- DataGridCaption.cs
- ServiceOperationListItem.cs
- DataGridColumnCollection.cs
- LocationFactory.cs
- SqlFormatter.cs
- RegexGroup.cs
- EncodingTable.cs
- WindowVisualStateTracker.cs
- ReachPrintTicketSerializerAsync.cs
- WizardStepCollectionEditor.cs
- TypeConvertions.cs
- CodeDomLoader.cs
- WindowCollection.cs
- SystemNetHelpers.cs
- TextSimpleMarkerProperties.cs
- BufferedGraphicsContext.cs
- PopupControlService.cs
- DetailsViewDeletedEventArgs.cs
- __FastResourceComparer.cs
- Section.cs
- TextEndOfLine.cs
- QuaternionAnimation.cs
- GeneratedView.cs
- ContentDefinition.cs
- ProfileGroupSettings.cs
- CodeDelegateInvokeExpression.cs