Code:
/ Dotnetfx_Win7_3.5.1 / Dotnetfx_Win7_3.5.1 / 3.5.1 / DEVDIV / depot / DevDiv / releases / whidbey / NetFXspW7 / ndp / fx / src / Data / System / Data / ProviderBase / DataReaderContainer.cs / 1 / 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
- ControlFilterExpression.cs
- CatalogPartChrome.cs
- TreeNodeClickEventArgs.cs
- PresentationTraceSources.cs
- WindowsFormsSynchronizationContext.cs
- DataGridDetailsPresenter.cs
- DataControlFieldTypeEditor.cs
- XmlRawWriter.cs
- LinkClickEvent.cs
- EntityDataSourceViewSchema.cs
- Model3D.cs
- ControlEvent.cs
- EntityDataSource.cs
- SecurityElement.cs
- TriState.cs
- WebPartMenu.cs
- ExceptQueryOperator.cs
- Listbox.cs
- WebPartCatalogCloseVerb.cs
- KnownIds.cs
- UncommonField.cs
- MonitorWrapper.cs
- EventSourceCreationData.cs
- CopyCodeAction.cs
- PrefixHandle.cs
- TextEditorDragDrop.cs
- WaveHeader.cs
- WebReferencesBuildProvider.cs
- TreeViewImageIndexConverter.cs
- XDRSchema.cs
- PositiveTimeSpanValidator.cs
- AppearanceEditorPart.cs
- BamlRecordHelper.cs
- HashUtility.cs
- RSAPKCS1KeyExchangeDeformatter.cs
- DispatchChannelSink.cs
- DocumentDesigner.cs
- WindowsBrush.cs
- XmlCDATASection.cs
- GeneratedCodeAttribute.cs
- ExpandSegment.cs
- ProxyWebPart.cs
- GeometryConverter.cs
- AnnotationService.cs
- SqlClientWrapperSmiStream.cs
- PasswordBoxAutomationPeer.cs
- DataColumnSelectionConverter.cs
- ToolStripCustomTypeDescriptor.cs
- DataServiceSaveChangesEventArgs.cs
- ConnectionsZone.cs
- XmlSerializerOperationBehavior.cs
- BindingSource.cs
- DropDownButton.cs
- TextOptionsInternal.cs
- TreeView.cs
- GestureRecognizer.cs
- GeometryDrawing.cs
- ProjectionPlanCompiler.cs
- SimplePropertyEntry.cs
- DataGridViewAccessibleObject.cs
- ErrorFormatterPage.cs
- ConstrainedGroup.cs
- ContainerParagraph.cs
- ShimAsPublicXamlType.cs
- Membership.cs
- ClientRuntime.cs
- ToolStripItemBehavior.cs
- safelink.cs
- NonParentingControl.cs
- TokenFactoryFactory.cs
- XpsFilter.cs
- ObjectListDataBindEventArgs.cs
- XPathMessageContext.cs
- xdrvalidator.cs
- propertyentry.cs
- VisualTreeUtils.cs
- ToolStripPanelRenderEventArgs.cs
- PrinterUnitConvert.cs
- ScheduleChanges.cs
- TreeNode.cs
- ImageListUtils.cs
- EventEntry.cs
- EnumerableRowCollectionExtensions.cs
- DateTime.cs
- SudsWriter.cs
- ElementUtil.cs
- SecurityRequiresReviewAttribute.cs
- LockRecoveryTask.cs
- TextElementEditingBehaviorAttribute.cs
- X509CertificateStore.cs
- Command.cs
- UpdateExpressionVisitor.cs
- ComplexTypeEmitter.cs
- BitVector32.cs
- ListControlDesigner.cs
- JapaneseLunisolarCalendar.cs
- TemplatedWizardStep.cs
- OdbcConnectionString.cs
- RandomNumberGenerator.cs
- CompressedStack.cs