Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / Data / System / Data / SQLTypes / SqlCharStream.cs / 1 / SqlCharStream.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //junfang //[....] //[....] //----------------------------------------------------------------------------- //************************************************************************* // @File: SqlStreamChars.cs // // Create by: JunFang // // Description: // // Notes: // // History: // // 04/17/01 JunFang Created. // // @EndHeader@ //************************************************************************* namespace System.Data.SqlTypes { using System; using System.IO; using System.Runtime.InteropServices; using System.Data.SqlTypes; #if WINFSInternalOnly public #else internal #endif abstract class SqlStreamChars: System.Data.SqlTypes.INullable, IDisposable { public abstract bool IsNull { get; } public abstract bool CanRead { get; } public abstract bool CanSeek { get; } public abstract bool CanWrite { get; } public abstract long Length { get; } public abstract long Position { get; set; } // -------------------------------------------------------------- // Public methods // ------------------------------------------------------------- public abstract int Read (char[] buffer, int offset, int count); public abstract void Write (char[] buffer, int offset, int count); public abstract long Seek (long offset, SeekOrigin origin); public abstract void SetLength (long value); public abstract void Flush (); public virtual void Close(){ Dispose(true); } void IDisposable.Dispose() { Dispose(true); } protected virtual void Dispose(bool disposing) { } public virtual int ReadChar() { // Reads one char from the stream by calling Read(char[], int, int). // Will return an char cast to an int or -1 on end of stream. // The performance of the default implementation on Stream is bad, // and any subclass with an internal buffer should override this method. char[] oneCharArray = new char[1]; int r = Read(oneCharArray, 0, 1); if (r==0) return -1; return oneCharArray[0]; } public virtual void WriteChar(char value) { // Writes one char from the stream by calling Write(char[], int, int). // The performance of the default implementation on Stream is bad, // and any subclass with an internal buffer should override this method. char[] oneCharArray = new char[1]; oneCharArray[0] = value; Write(oneCharArray, 0, 1); } // Private class: the Null SqlStreamChars private class NullSqlStreamChars : SqlStreamChars { // -------------------------------------------------------------- // Constructor(s) // -------------------------------------------------------------- internal NullSqlStreamChars() { } // ------------------------------------------------------------- // Public properties // -------------------------------------------------------------- public override bool IsNull { get { return true; } } public override bool CanRead { get { return false; } } public override bool CanSeek { get { return false; } } public override bool CanWrite { get { return false; } } public override long Length { get { throw new SqlNullValueException(); } } public override long Position { get { throw new SqlNullValueException(); } set { throw new SqlNullValueException(); } } // ------------------------------------------------------------- // Public methods // ------------------------------------------------------------- public override int Read (char[] buffer, int offset, int count) { throw new SqlNullValueException(); } public override void Write (char[] buffer, int offset, int count) { throw new SqlNullValueException(); } public override long Seek (long offset, SeekOrigin origin) { throw new SqlNullValueException(); } public override void SetLength (long value) { throw new SqlNullValueException(); } public override void Flush () { throw new SqlNullValueException(); } public override void Close () { } } // class NullSqlStreamChars // The Null instance public static SqlStreamChars Null { get { return new NullSqlStreamChars(); } } } // class SqlStreamChars } // namespace System.Data.SqlTypes // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
Link Menu
This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- ObjectList.cs
- MimeAnyImporter.cs
- CroppedBitmap.cs
- SocketAddress.cs
- XmlSchemaGroup.cs
- GridViewCommandEventArgs.cs
- BinaryObjectReader.cs
- Int16Converter.cs
- ConstructorNeedsTagAttribute.cs
- Selection.cs
- JapaneseLunisolarCalendar.cs
- WrapPanel.cs
- SyndicationFeed.cs
- MaskedTextBox.cs
- StylusShape.cs
- ServicePointManager.cs
- Solver.cs
- TreeViewBindingsEditor.cs
- PolicyStatement.cs
- BufferModeSettings.cs
- QilStrConcatenator.cs
- GradientBrush.cs
- SafeBitVector32.cs
- ClientProtocol.cs
- HandledMouseEvent.cs
- PropertyChangedEventManager.cs
- ExtenderProvidedPropertyAttribute.cs
- UInt32Storage.cs
- MonitorWrapper.cs
- XmlAttribute.cs
- BufferAllocator.cs
- InvalidCastException.cs
- FixedSOMPageElement.cs
- IntPtr.cs
- ComboBoxHelper.cs
- InstanceBehavior.cs
- XPathScanner.cs
- X509Certificate2Collection.cs
- FreezableOperations.cs
- WebBrowserUriTypeConverter.cs
- SmiRequestExecutor.cs
- SoapCommonClasses.cs
- Transform3DCollection.cs
- CustomWebEventKey.cs
- PropertyMetadata.cs
- StyleCollection.cs
- ApplicationId.cs
- RawStylusInputReport.cs
- MetadataSerializer.cs
- TogglePattern.cs
- Separator.cs
- AsyncCompletedEventArgs.cs
- TextRangeEditLists.cs
- TextPointer.cs
- TextInfo.cs
- ProcessProtocolHandler.cs
- SspiWrapper.cs
- XsltInput.cs
- Error.cs
- MimeWriter.cs
- TraceListeners.cs
- FtpRequestCacheValidator.cs
- RangeBaseAutomationPeer.cs
- UnsafeNativeMethods.cs
- VisualTreeUtils.cs
- TextAutomationPeer.cs
- ObjectParameter.cs
- URLMembershipCondition.cs
- XmlDataImplementation.cs
- NextPreviousPagerField.cs
- HyperlinkAutomationPeer.cs
- CornerRadius.cs
- OracleParameter.cs
- ContextStaticAttribute.cs
- EnlistmentTraceIdentifier.cs
- BinaryObjectReader.cs
- RepeaterItemEventArgs.cs
- SystemNetworkInterface.cs
- AddInSegmentDirectoryNotFoundException.cs
- BinaryMethodMessage.cs
- SerialPort.cs
- XhtmlBasicLabelAdapter.cs
- HttpGetProtocolReflector.cs
- SingleResultAttribute.cs
- CurrentTimeZone.cs
- DefaultCompensation.cs
- Baml6ConstructorInfo.cs
- SerializationFieldInfo.cs
- VolatileEnlistmentMultiplexing.cs
- CodeConditionStatement.cs
- Scripts.cs
- DataBoundLiteralControl.cs
- UnwrappedTypesXmlSerializerManager.cs
- ConstraintEnumerator.cs
- CacheChildrenQuery.cs
- EnumValAlphaComparer.cs
- FocusWithinProperty.cs
- XmlBindingWorker.cs
- DataFormats.cs
- List.cs