Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Data / System / Data / ProviderBase / DataReaderContainer.cs / 1305376 / DataReaderContainer.cs
//------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Data.ProviderBase { using System; using System.Data; using System.Data.Common; using System.Diagnostics; internal abstract class DataReaderContainer { protected readonly IDataReader _dataReader; protected int _fieldCount; static internal DataReaderContainer Create(IDataReader dataReader, bool returnProviderSpecificTypes) { if (returnProviderSpecificTypes) { DbDataReader providerSpecificDataReader = (dataReader as DbDataReader); if (null != providerSpecificDataReader) { return new ProviderSpecificDataReader(dataReader, providerSpecificDataReader); } } return new CommonLanguageSubsetDataReader(dataReader); } protected DataReaderContainer(IDataReader dataReader) { Debug.Assert(null != dataReader, "null dataReader"); _dataReader = dataReader; } internal int FieldCount { get { return _fieldCount; } } internal abstract bool ReturnProviderSpecificTypes { get; } protected abstract int VisibleFieldCount { get; } internal abstract Type GetFieldType(int ordinal); internal abstract object GetValue(int ordinal); internal abstract int GetValues(object[] values); internal string GetName(int ordinal) { string fieldName = _dataReader.GetName(ordinal); Debug.Assert(null != fieldName, "null GetName"); return ((null != fieldName) ? fieldName : ""); } internal DataTable GetSchemaTable() { return _dataReader.GetSchemaTable(); } internal bool NextResult() { _fieldCount = 0; if (_dataReader.NextResult()) { _fieldCount = VisibleFieldCount; return true; } return false; } internal bool Read() { return _dataReader.Read(); } private sealed class ProviderSpecificDataReader : DataReaderContainer { private DbDataReader _providerSpecificDataReader; internal ProviderSpecificDataReader(IDataReader dataReader, DbDataReader dbDataReader) : base(dataReader) { Debug.Assert(null != dataReader, "null dbDataReader"); _providerSpecificDataReader = dbDataReader; _fieldCount = VisibleFieldCount; } internal override bool ReturnProviderSpecificTypes { get { return true; } } protected override int VisibleFieldCount { get { int fieldCount = _providerSpecificDataReader.VisibleFieldCount; Debug.Assert(0 <= fieldCount, "negative FieldCount"); return ((0 <= fieldCount) ? fieldCount : 0); } } internal override Type GetFieldType(int ordinal) { Type fieldType = _providerSpecificDataReader.GetProviderSpecificFieldType(ordinal); Debug.Assert(null != fieldType, "null FieldType"); return fieldType; } internal override object GetValue(int ordinal) { return _providerSpecificDataReader.GetProviderSpecificValue(ordinal); } internal override int GetValues(object[] values) { return _providerSpecificDataReader.GetProviderSpecificValues(values); } } private sealed class CommonLanguageSubsetDataReader : DataReaderContainer { internal CommonLanguageSubsetDataReader(IDataReader dataReader ) : base(dataReader) { _fieldCount = VisibleFieldCount; } internal override bool ReturnProviderSpecificTypes { get { return false; } } protected override int VisibleFieldCount { get { int fieldCount = _dataReader.FieldCount; Debug.Assert(0 <= fieldCount, "negative FieldCount"); return ((0 <= fieldCount) ? fieldCount : 0); } } internal override Type GetFieldType(int ordinal) { return _dataReader.GetFieldType(ordinal); } internal override object GetValue(int ordinal) { return _dataReader.GetValue(ordinal); } internal override int GetValues(object[] values) { return _dataReader.GetValues(values); } } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //------------------------------------------------------------------------------ //// Copyright (c) Microsoft Corporation. All rights reserved. // //[....] //----------------------------------------------------------------------------- namespace System.Data.ProviderBase { using System; using System.Data; using System.Data.Common; using System.Diagnostics; internal abstract class DataReaderContainer { protected readonly IDataReader _dataReader; protected int _fieldCount; static internal DataReaderContainer Create(IDataReader dataReader, bool returnProviderSpecificTypes) { if (returnProviderSpecificTypes) { DbDataReader providerSpecificDataReader = (dataReader as DbDataReader); if (null != providerSpecificDataReader) { return new ProviderSpecificDataReader(dataReader, providerSpecificDataReader); } } return new CommonLanguageSubsetDataReader(dataReader); } protected DataReaderContainer(IDataReader dataReader) { Debug.Assert(null != dataReader, "null dataReader"); _dataReader = dataReader; } internal int FieldCount { get { return _fieldCount; } } internal abstract bool ReturnProviderSpecificTypes { get; } protected abstract int VisibleFieldCount { get; } internal abstract Type GetFieldType(int ordinal); internal abstract object GetValue(int ordinal); internal abstract int GetValues(object[] values); internal string GetName(int ordinal) { string fieldName = _dataReader.GetName(ordinal); Debug.Assert(null != fieldName, "null GetName"); return ((null != fieldName) ? fieldName : ""); } internal DataTable GetSchemaTable() { return _dataReader.GetSchemaTable(); } internal bool NextResult() { _fieldCount = 0; if (_dataReader.NextResult()) { _fieldCount = VisibleFieldCount; return true; } return false; } internal bool Read() { return _dataReader.Read(); } private sealed class ProviderSpecificDataReader : DataReaderContainer { private DbDataReader _providerSpecificDataReader; internal ProviderSpecificDataReader(IDataReader dataReader, DbDataReader dbDataReader) : base(dataReader) { Debug.Assert(null != dataReader, "null dbDataReader"); _providerSpecificDataReader = dbDataReader; _fieldCount = VisibleFieldCount; } internal override bool ReturnProviderSpecificTypes { get { return true; } } protected override int VisibleFieldCount { get { int fieldCount = _providerSpecificDataReader.VisibleFieldCount; Debug.Assert(0 <= fieldCount, "negative FieldCount"); return ((0 <= fieldCount) ? fieldCount : 0); } } internal override Type GetFieldType(int ordinal) { Type fieldType = _providerSpecificDataReader.GetProviderSpecificFieldType(ordinal); Debug.Assert(null != fieldType, "null FieldType"); return fieldType; } internal override object GetValue(int ordinal) { return _providerSpecificDataReader.GetProviderSpecificValue(ordinal); } internal override int GetValues(object[] values) { return _providerSpecificDataReader.GetProviderSpecificValues(values); } } private sealed class CommonLanguageSubsetDataReader : DataReaderContainer { internal CommonLanguageSubsetDataReader(IDataReader dataReader ) : base(dataReader) { _fieldCount = VisibleFieldCount; } internal override bool ReturnProviderSpecificTypes { get { return false; } } protected override int VisibleFieldCount { get { int fieldCount = _dataReader.FieldCount; Debug.Assert(0 <= fieldCount, "negative FieldCount"); return ((0 <= fieldCount) ? fieldCount : 0); } } internal override Type GetFieldType(int ordinal) { return _dataReader.GetFieldType(ordinal); } internal override object GetValue(int ordinal) { return _dataReader.GetValue(ordinal); } internal override int GetValues(object[] values) { return _dataReader.GetValues(values); } } } } // 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
- StreamWriter.cs
- WebPartExportVerb.cs
- ExpressionBuilder.cs
- WebZone.cs
- ByteStreamGeometryContext.cs
- DescendantQuery.cs
- ToolStripContainer.cs
- Console.cs
- SafeSystemMetrics.cs
- Brushes.cs
- EmbeddedMailObjectsCollection.cs
- EntitySet.cs
- BamlMapTable.cs
- RTTypeWrapper.cs
- XmlObjectSerializerContext.cs
- AdornerPresentationContext.cs
- CompoundFileDeflateTransform.cs
- NotifyParentPropertyAttribute.cs
- FileDialogCustomPlacesCollection.cs
- DiagnosticsElement.cs
- TableLayoutPanelDesigner.cs
- ValidationRule.cs
- OneToOneMappingSerializer.cs
- StylusButtonCollection.cs
- Int16.cs
- EventLogEntry.cs
- StringDictionary.cs
- SqlConnectionFactory.cs
- NumberFunctions.cs
- TypeLoadException.cs
- CqlBlock.cs
- AssociationType.cs
- DataGridViewDataErrorEventArgs.cs
- NamedPipeActivation.cs
- SchemaExporter.cs
- TextDecorationCollection.cs
- HttpCapabilitiesBase.cs
- Site.cs
- BrowsableAttribute.cs
- ButtonBaseAutomationPeer.cs
- RouteItem.cs
- AttributeXamlType.cs
- EventLogEntry.cs
- XmlDownloadManager.cs
- Translator.cs
- PropertyGeneratedEventArgs.cs
- ApplicationContext.cs
- RSAProtectedConfigurationProvider.cs
- DBSchemaTable.cs
- WorkflowRuntimeService.cs
- NullableBoolConverter.cs
- CfgArc.cs
- AddInController.cs
- RepeatBehaviorConverter.cs
- OdbcInfoMessageEvent.cs
- GestureRecognitionResult.cs
- SchemaDeclBase.cs
- SplitterCancelEvent.cs
- Stylesheet.cs
- StreamGeometry.cs
- HttpModuleActionCollection.cs
- Transform.cs
- BuildProviderCollection.cs
- ReferenceConverter.cs
- IncrementalReadDecoders.cs
- Label.cs
- UnknownBitmapEncoder.cs
- RightNameExpirationInfoPair.cs
- GetImportedCardRequest.cs
- AppDomainProtocolHandler.cs
- EdmEntityTypeAttribute.cs
- X509Chain.cs
- InvalidPrinterException.cs
- SqlTrackingQuery.cs
- NonSerializedAttribute.cs
- ProfilePropertyMetadata.cs
- WebBrowserNavigatedEventHandler.cs
- RectAnimation.cs
- AuthenticateEventArgs.cs
- PersonalizationProviderCollection.cs
- HttpApplicationFactory.cs
- HyperLinkColumn.cs
- RepeaterCommandEventArgs.cs
- CommandLibraryHelper.cs
- BitmapSizeOptions.cs
- GuidTagList.cs
- ExpressionVisitor.cs
- MembershipSection.cs
- NTAccount.cs
- CmsInterop.cs
- ReferencedAssemblyResolver.cs
- Tablet.cs
- ChannelSinkStacks.cs
- IncrementalCompileAnalyzer.cs
- ControlType.cs
- QilPatternVisitor.cs
- ValidationResults.cs
- DataSourceXmlClassAttribute.cs
- SecurityTokenValidationException.cs
- StringExpressionSet.cs