Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / Orcas / NetFXw7 / wpf / src / Shared / MS / Internal / DecoderFallbackWithFailureFlag.cs / 1 / DecoderFallbackWithFailureFlag.cs
//---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: DecoderFallbackWithFailureFlag is used when the developer wants Encoding.GetChars() method to fail // without throwing an exception when decoding cannot be performed. // Usage pattern is: // DecoderFallbackWithFailureFlag fallback = new DecoderFallbackWithFailureFlag(); // Encoding e = Encoding.GetEncoding(codePage, EncoderFallback.ExceptionFallback, fallback); // e.GetChars(bytesToDecode); // if (fallback.HasFailed) // { // // Perform fallback and reset the failure flag. // fallback.HasFailed = false; // } // // History: // 05/03/2005 : mleonov - Created // //--------------------------------------------------------------------------- using System.Text; namespace MS.Internal { ////// This class is similar to the standard DecoderExceptionFallback class, /// except that for performance reasons it sets a Boolean failure flag /// instead of throwing exception. /// internal class DecoderFallbackWithFailureFlag : DecoderFallback { public DecoderFallbackWithFailureFlag() { } public override DecoderFallbackBuffer CreateFallbackBuffer() { return new FallbackBuffer(this); } ////// The maximum number of characters this instance can return. /// public override int MaxCharCount { get { return 0; } } ////// Returns whether decoding failed. /// public bool HasFailed { get { return _hasFailed; } set { _hasFailed = value; } } private bool _hasFailed; // false by default ////// A special implementation of DecoderFallbackBuffer that sets the failure flag /// in the parent DecoderFallbackWithFailureFlag class. /// private class FallbackBuffer : DecoderFallbackBuffer { public FallbackBuffer(DecoderFallbackWithFailureFlag parent) { _parent = parent; } ////// Indicates whether a substitute string can be emitted if an input byte sequence cannot be decoded. /// Parameters specify an input byte sequence, and the index position of a byte in the input. /// /// An input array of bytes. /// The index position of a byte in bytesUnknown. ///true if a string exists that can be inserted in the output /// instead of decoding the byte specified in bytesUnknown; /// false if the input byte should be ignored. public override bool Fallback(byte[] bytesUnknown, int index) { _parent.HasFailed = true; return false; } ////// Retrieves the next character in the fallback buffer. /// ///The next Unicode character in the fallback buffer. public override char GetNextChar() { return (char)0; } ////// Prepares the GetNextChar method to retrieve the preceding character in the fallback buffer. /// ///true if the MovePrevious operation was successful; otherwise, false. public override bool MovePrevious() { return false; } ////// Gets the number of characters in this instance of DecoderFallbackBuffer that remain to be processed. /// public override int Remaining { get { return 0; } } private DecoderFallbackWithFailureFlag _parent; } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------------- // // Copyright (c) Microsoft Corporation. All rights reserved. // // // Description: DecoderFallbackWithFailureFlag is used when the developer wants Encoding.GetChars() method to fail // without throwing an exception when decoding cannot be performed. // Usage pattern is: // DecoderFallbackWithFailureFlag fallback = new DecoderFallbackWithFailureFlag(); // Encoding e = Encoding.GetEncoding(codePage, EncoderFallback.ExceptionFallback, fallback); // e.GetChars(bytesToDecode); // if (fallback.HasFailed) // { // // Perform fallback and reset the failure flag. // fallback.HasFailed = false; // } // // History: // 05/03/2005 : mleonov - Created // //--------------------------------------------------------------------------- using System.Text; namespace MS.Internal { ////// This class is similar to the standard DecoderExceptionFallback class, /// except that for performance reasons it sets a Boolean failure flag /// instead of throwing exception. /// internal class DecoderFallbackWithFailureFlag : DecoderFallback { public DecoderFallbackWithFailureFlag() { } public override DecoderFallbackBuffer CreateFallbackBuffer() { return new FallbackBuffer(this); } ////// The maximum number of characters this instance can return. /// public override int MaxCharCount { get { return 0; } } ////// Returns whether decoding failed. /// public bool HasFailed { get { return _hasFailed; } set { _hasFailed = value; } } private bool _hasFailed; // false by default ////// A special implementation of DecoderFallbackBuffer that sets the failure flag /// in the parent DecoderFallbackWithFailureFlag class. /// private class FallbackBuffer : DecoderFallbackBuffer { public FallbackBuffer(DecoderFallbackWithFailureFlag parent) { _parent = parent; } ////// Indicates whether a substitute string can be emitted if an input byte sequence cannot be decoded. /// Parameters specify an input byte sequence, and the index position of a byte in the input. /// /// An input array of bytes. /// The index position of a byte in bytesUnknown. ///true if a string exists that can be inserted in the output /// instead of decoding the byte specified in bytesUnknown; /// false if the input byte should be ignored. public override bool Fallback(byte[] bytesUnknown, int index) { _parent.HasFailed = true; return false; } ////// Retrieves the next character in the fallback buffer. /// ///The next Unicode character in the fallback buffer. public override char GetNextChar() { return (char)0; } ////// Prepares the GetNextChar method to retrieve the preceding character in the fallback buffer. /// ///true if the MovePrevious operation was successful; otherwise, false. public override bool MovePrevious() { return false; } ////// Gets the number of characters in this instance of DecoderFallbackBuffer that remain to be processed. /// public override int Remaining { get { return 0; } } private DecoderFallbackWithFailureFlag _parent; } } } // 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
- Cursor.cs
- SHA1CryptoServiceProvider.cs
- CompiledQuery.cs
- PropertyPath.cs
- RightsManagementResourceHelper.cs
- SyndicationItem.cs
- FixedSOMTable.cs
- SiteMapNodeItemEventArgs.cs
- OLEDB_Enum.cs
- DesignerAttribute.cs
- Parser.cs
- TableParaClient.cs
- EntityContainerAssociationSetEnd.cs
- StickyNoteHelper.cs
- XmlSchemaAttributeGroup.cs
- Label.cs
- BinaryObjectWriter.cs
- XslCompiledTransform.cs
- TypeElementCollection.cs
- RIPEMD160.cs
- WebBrowserHelper.cs
- WebPartChrome.cs
- AccessViolationException.cs
- ComboBox.cs
- DataServiceRequestOfT.cs
- CopyNamespacesAction.cs
- BitmapImage.cs
- D3DImage.cs
- Formatter.cs
- XsdCachingReader.cs
- TypeBuilderInstantiation.cs
- XmlCompatibilityReader.cs
- SafeWaitHandle.cs
- GPPOINT.cs
- SerializationSectionGroup.cs
- ProfessionalColorTable.cs
- TokenBasedSet.cs
- ComContractElementCollection.cs
- RTLAwareMessageBox.cs
- PathGeometry.cs
- VerificationAttribute.cs
- ApplicationCommands.cs
- XmlSchemaException.cs
- Int32Converter.cs
- SystemColors.cs
- StringConcat.cs
- GridViewUpdatedEventArgs.cs
- MultilineStringConverter.cs
- TextEditorMouse.cs
- documentation.cs
- GridViewUpdateEventArgs.cs
- RbTree.cs
- BaseProcessor.cs
- Parallel.cs
- ComponentResourceKeyConverter.cs
- WebPartDisplayMode.cs
- BindingRestrictions.cs
- HttpSysSettings.cs
- RSAPKCS1KeyExchangeFormatter.cs
- ParagraphResult.cs
- ClientProxyGenerator.cs
- CharKeyFrameCollection.cs
- DataGridViewRowsAddedEventArgs.cs
- IIS7WorkerRequest.cs
- StreamSecurityUpgradeInitiator.cs
- StandardToolWindows.cs
- XmlSerializerAssemblyAttribute.cs
- DataGridViewColumn.cs
- basecomparevalidator.cs
- PopupRoot.cs
- DataFieldConverter.cs
- DescendentsWalker.cs
- GetIndexBinder.cs
- ToolboxDataAttribute.cs
- Knowncolors.cs
- GradientBrush.cs
- Timer.cs
- AsyncDataRequest.cs
- DocumentGridPage.cs
- ContainerParaClient.cs
- ImageCodecInfo.cs
- PlainXmlDeserializer.cs
- DataTableReaderListener.cs
- StringConcat.cs
- ToolStripDropDownClosedEventArgs.cs
- VirtualPathProvider.cs
- PerfCounters.cs
- PersonalizationProviderCollection.cs
- WebErrorHandler.cs
- FamilyMap.cs
- ActivityDesignerLayoutSerializers.cs
- SingleAnimationUsingKeyFrames.cs
- Wizard.cs
- MenuItemStyleCollectionEditor.cs
- TracedNativeMethods.cs
- FrugalMap.cs
- PlatformNotSupportedException.cs
- ResXResourceReader.cs
- Stackframe.cs
- XdrBuilder.cs