Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / 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
- Authorization.cs
- LoginCancelEventArgs.cs
- ComponentSerializationService.cs
- SyntaxCheck.cs
- mda.cs
- MethodSet.cs
- LinqDataSourceSelectEventArgs.cs
- TypeLoadException.cs
- PartitionResolver.cs
- HttpModuleCollection.cs
- ListDictionaryInternal.cs
- NativeMethods.cs
- CallContext.cs
- MediaContext.cs
- WindowsTitleBar.cs
- UnitySerializationHolder.cs
- Qualifier.cs
- StringAnimationUsingKeyFrames.cs
- UiaCoreApi.cs
- SynchronizedInputPattern.cs
- ObjectCacheHost.cs
- DecoderBestFitFallback.cs
- SecurityKeyUsage.cs
- QueryPageSettingsEventArgs.cs
- ColumnHeaderConverter.cs
- _NativeSSPI.cs
- DataGridViewCheckBoxCell.cs
- SafeEventLogWriteHandle.cs
- DES.cs
- TreeViewItemAutomationPeer.cs
- RowBinding.cs
- RectangleF.cs
- X509DefaultServiceCertificateElement.cs
- SoapElementAttribute.cs
- SecureConversationVersion.cs
- TypeListConverter.cs
- PersonalizableTypeEntry.cs
- FontClient.cs
- Root.cs
- Select.cs
- CompilerInfo.cs
- EventPrivateKey.cs
- SmtpSpecifiedPickupDirectoryElement.cs
- KeyGesture.cs
- XmlEncoding.cs
- TextServicesDisplayAttributePropertyRanges.cs
- StackBuilderSink.cs
- PreservationFileReader.cs
- RegexCharClass.cs
- Int16Converter.cs
- followingquery.cs
- FilteredXmlReader.cs
- DesignerMetadata.cs
- ConfigurationSectionGroupCollection.cs
- COSERVERINFO.cs
- MarkupCompiler.cs
- HtmlTableCell.cs
- SoundPlayerAction.cs
- PersonalizationEntry.cs
- HttpHandlerActionCollection.cs
- OdbcTransaction.cs
- ACL.cs
- TextBlock.cs
- DataProtection.cs
- _ListenerRequestStream.cs
- FormViewUpdateEventArgs.cs
- SqlError.cs
- SafeTimerHandle.cs
- MetadataCache.cs
- XmlParserContext.cs
- PrintController.cs
- ActivityExecutionFilter.cs
- RenderData.cs
- RawStylusInputCustomData.cs
- GeneratedCodeAttribute.cs
- PagesSection.cs
- RequestDescription.cs
- KeyGesture.cs
- ParagraphResult.cs
- DecoderFallbackWithFailureFlag.cs
- LicenseManager.cs
- PropertyPushdownHelper.cs
- SqlNamer.cs
- DataBinding.cs
- BulletedListDesigner.cs
- SecurityContext.cs
- WpfPayload.cs
- RegistryPermission.cs
- InfiniteIntConverter.cs
- XamlTypeMapperSchemaContext.cs
- IndexedString.cs
- RuleElement.cs
- ExpressionPrefixAttribute.cs
- XmlHierarchicalEnumerable.cs
- XamlInt32CollectionSerializer.cs
- CompilerTypeWithParams.cs
- BaseEntityWrapper.cs
- DbConnectionOptions.cs
- MethodRental.cs
- CompareInfo.cs