Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / clr / src / BCL / System / IO / TextReader.cs / 1305376 / TextReader.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** Class: TextReader ** **[....] ** ** ** Purpose: Abstract base class for all Text-only Readers. ** Subclasses will include StreamReader & StringReader. ** ** ===========================================================*/ using System; using System.Text; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using System.Reflection; using System.Security.Permissions; using System.Diagnostics.Contracts; namespace System.IO { // This abstract base class represents a reader that can read a sequential // stream of characters. This is not intended for reading bytes - // there are methods on the Stream class to read bytes. // A subclass must minimally implement the Peek() and Read() methods. // // This class is intended for character input, not bytes. // There are methods on the Stream class for reading bytes. [Serializable] [ComVisible(true)] #if FEATURE_REMOTING public abstract class TextReader : MarshalByRefObject, IDisposable { #if false } #endif // false #else // FEATURE_REMOTING public abstract class TextReader : IDisposable { #endif // FEATURE_REMOTING public static readonly TextReader Null = new NullTextReader(); protected TextReader() {} // Closes this TextReader and releases any system resources associated with the // TextReader. Following a call to Close, any operations on the TextReader // may raise exceptions. // // This default method is empty, but descendant classes can override the // method to provide the appropriate functionality. public virtual void Close() { Dispose(true); GC.SuppressFinalize(this); } public void Dispose() { Dispose(true); GC.SuppressFinalize(this); } protected virtual void Dispose(bool disposing) { } // Returns the next available character without actually reading it from // the input stream. The current position of the TextReader is not changed by // this operation. The returned value is -1 if no further characters are // available. // // This default method simply returns -1. // [Pure] public virtual int Peek() { Contract.Ensures(Contract.Result() >= -1); return -1; } // Reads the next character from the input stream. The returned value is // -1 if no further characters are available. // // This default method simply returns -1. // public virtual int Read() { Contract.Ensures(Contract.Result () >= -1); return -1; } // Reads a block of characters. This method will read up to // count characters from this TextReader into the // buffer character array starting at position // index. Returns the actual number of characters read. // public virtual int Read([In, Out] char[] buffer, int index, int count) { if (buffer==null) throw new ArgumentNullException("buffer", Environment.GetResourceString("ArgumentNull_Buffer")); if (index < 0) throw new ArgumentOutOfRangeException("index", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (count < 0) throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum")); if (buffer.Length - index < count) throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen")); Contract.Ensures(Contract.Result () >= 0); Contract.Ensures(Contract.Result () <= Contract.OldValue(count)); Contract.EndContractBlock(); int n = 0; do { int ch = Read(); if (ch == -1) break; buffer[index + n++] = (char)ch; } while (n < count); return n; } // Reads all characters from the current position to the end of the // TextReader, and returns them as one string. public virtual String ReadToEnd() { Contract.Ensures(Contract.Result () != null); char[] chars = new char[4096]; int len; StringBuilder sb = new StringBuilder(4096); while((len=Read(chars, 0, chars.Length)) != 0) { sb.Append(chars, 0, len); } return sb.ToString(); } // Blocking version of read. Returns only when count // characters have been read or the end of the file was reached. // public virtual int ReadBlock([In, Out] char[] buffer, int index, int count) { Contract.Ensures(Contract.Result () >= 0); Contract.Ensures(Contract.Result () <= count); int i, n = 0; do { n += (i = Read(buffer, index + n, count - n)); } while (i > 0 && n < count); return n; } // Reads a line. A line is defined as a sequence of characters followed by // a carriage return ('\r'), a line feed ('\n'), or a carriage return // immediately followed by a line feed. The resulting string does not // contain the terminating carriage return and/or line feed. The returned // value is null if the end of the input stream has been reached. // public virtual String ReadLine() { StringBuilder sb = new StringBuilder(); while (true) { int ch = Read(); if (ch == -1) break; if (ch == '\r' || ch == '\n') { if (ch == '\r' && Peek() == '\n') Read(); return sb.ToString(); } sb.Append((char)ch); } if (sb.Length > 0) return sb.ToString(); return null; } [HostProtection(Synchronization=true)] public static TextReader Synchronized(TextReader reader) { if (reader==null) throw new ArgumentNullException("reader"); Contract.Ensures(Contract.Result () != null); Contract.EndContractBlock(); if (reader is SyncTextReader) return reader; return new SyncTextReader(reader); } [Serializable] private sealed class NullTextReader : TextReader { public NullTextReader(){} public override int Read(char[] buffer, int index, int count) { return 0; } public override String ReadLine() { return null; } } [Serializable] internal sealed class SyncTextReader : TextReader { internal TextReader _in; internal SyncTextReader(TextReader t) { _in = t; } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override void Close() { // So that any overriden Close() gets run _in.Close(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] protected override void Dispose(bool disposing) { // Explicitly pick up a potentially methodimpl'ed Dispose if (disposing) ((IDisposable)_in).Dispose(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int Peek() { return _in.Peek(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int Read() { return _in.Read(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int Read([In, Out] char[] buffer, int index, int count) { return _in.Read(buffer, index, count); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override int ReadBlock([In, Out] char[] buffer, int index, int count) { return _in.ReadBlock(buffer, index, count); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override String ReadLine() { return _in.ReadLine(); } [MethodImplAttribute(MethodImplOptions.Synchronized)] public override String ReadToEnd() { return _in.ReadToEnd(); } } } } // 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
- MultipartContentParser.cs
- ComponentChangedEvent.cs
- SelectorAutomationPeer.cs
- LineServicesRun.cs
- DomainUpDown.cs
- WindowsContainer.cs
- TableDetailsRow.cs
- UpdateRecord.cs
- RegexRunner.cs
- XamlSerializerUtil.cs
- XmlHierarchicalDataSourceView.cs
- StylusShape.cs
- NotifyParentPropertyAttribute.cs
- JoinTreeNode.cs
- AttributeQuery.cs
- ModuleBuilderData.cs
- SQLBytesStorage.cs
- HtmlTitle.cs
- AnonymousIdentificationModule.cs
- EdmSchemaAttribute.cs
- DetailsViewPageEventArgs.cs
- ColumnMapVisitor.cs
- RegexMatchCollection.cs
- Boolean.cs
- RectAnimation.cs
- ResourceReader.cs
- OdbcConnection.cs
- SamlAssertionDirectKeyIdentifierClause.cs
- Operand.cs
- COM2ComponentEditor.cs
- WpfXamlLoader.cs
- StoreAnnotationsMap.cs
- _DigestClient.cs
- CopyOfAction.cs
- XmlArrayItemAttribute.cs
- CookieParameter.cs
- X509CertificateRecipientServiceCredential.cs
- SafeMarshalContext.cs
- XmlEnumAttribute.cs
- TextRange.cs
- IndexedWhereQueryOperator.cs
- CodeValidator.cs
- UInt32Converter.cs
- AssemblyInfo.cs
- SafeEventLogReadHandle.cs
- XmlSerializerNamespaces.cs
- XPathAxisIterator.cs
- SecurityContextSecurityTokenParameters.cs
- DataGridViewSelectedCellCollection.cs
- EnumValAlphaComparer.cs
- ActiveXContainer.cs
- dsa.cs
- RoutedEventArgs.cs
- WhitespaceRuleLookup.cs
- ConfigurationElement.cs
- PolicyManager.cs
- NumberFunctions.cs
- XamlSerializerUtil.cs
- _ProxyChain.cs
- LassoHelper.cs
- AsnEncodedData.cs
- Queue.cs
- RbTree.cs
- DeclarativeCatalogPart.cs
- AnnotationAdorner.cs
- X500Name.cs
- TrackingRecord.cs
- ResourcesBuildProvider.cs
- SchemaLookupTable.cs
- HttpCapabilitiesSectionHandler.cs
- ValidationContext.cs
- ConfigurationSectionGroup.cs
- EventToken.cs
- M3DUtil.cs
- ParallelRangeManager.cs
- CompressionTracing.cs
- WindowsToolbarAsMenu.cs
- XhtmlBasicLiteralTextAdapter.cs
- TextCollapsingProperties.cs
- LocatorPart.cs
- DataBindingExpressionBuilder.cs
- exports.cs
- MissingMemberException.cs
- ReflectPropertyDescriptor.cs
- ToolbarAUtomationPeer.cs
- PageSetupDialog.cs
- relpropertyhelper.cs
- diagnosticsswitches.cs
- RegistryPermission.cs
- QuaternionValueSerializer.cs
- SqlIdentifier.cs
- ImageDrawing.cs
- SizeValueSerializer.cs
- BuildProvider.cs
- ConfigXmlAttribute.cs
- CompositeCollection.cs
- EndPoint.cs
- WindowPattern.cs
- DataGridBoolColumn.cs
- XDRSchema.cs