Code:
/ FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / 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.
Link Menu

This book is available now!
Buy at Amazon US or
Buy at Amazon UK
- DeliveryStrategy.cs
- ResourcePool.cs
- DataGridRowHeader.cs
- TextEffect.cs
- CollectionDataContract.cs
- LinqDataSourceDeleteEventArgs.cs
- AdapterDictionary.cs
- XmlSchemaChoice.cs
- HtmlWindowCollection.cs
- PublishLicense.cs
- StringUtil.cs
- SplineKeyFrames.cs
- ProxyHwnd.cs
- Imaging.cs
- RenderingEventArgs.cs
- UpDownEvent.cs
- Rotation3DKeyFrameCollection.cs
- DockPattern.cs
- InsufficientMemoryException.cs
- DataRowExtensions.cs
- CodeMemberMethod.cs
- AppDomainManager.cs
- DataGridViewTopRowAccessibleObject.cs
- Attributes.cs
- TypeBuilder.cs
- SafeHandle.cs
- Hash.cs
- VerificationException.cs
- OdbcConnectionString.cs
- TransportationConfigurationTypeInstallComponent.cs
- AssociativeAggregationOperator.cs
- EntityDataSourceConfigureObjectContext.cs
- DocumentSequenceHighlightLayer.cs
- WebBaseEventKeyComparer.cs
- DataStreams.cs
- Attribute.cs
- QilTernary.cs
- xmlglyphRunInfo.cs
- TextCompositionManager.cs
- X509SecurityTokenAuthenticator.cs
- PointAnimationUsingPath.cs
- ExceptionUtil.cs
- CodeSnippetExpression.cs
- columnmapfactory.cs
- Timeline.cs
- DesignerAdapterUtil.cs
- SynchronizationHandlesCodeDomSerializer.cs
- safex509handles.cs
- StylusButton.cs
- FixedSOMImage.cs
- StandardBindingOptionalReliableSessionElement.cs
- ExpanderAutomationPeer.cs
- DecoderFallback.cs
- CharUnicodeInfo.cs
- CompilerLocalReference.cs
- SQLBoolean.cs
- ReadContentAsBinaryHelper.cs
- CheckoutException.cs
- log.cs
- DesignerOptionService.cs
- ScrollBarRenderer.cs
- DocComment.cs
- RightsManagementEncryptionTransform.cs
- CodeAttributeDeclaration.cs
- ReferenceEqualityComparer.cs
- __Error.cs
- XNodeValidator.cs
- EventToken.cs
- FormsAuthentication.cs
- FrameworkElementAutomationPeer.cs
- ServiceOperationWrapper.cs
- Point3DCollectionConverter.cs
- XhtmlBasicPhoneCallAdapter.cs
- LinqToSqlWrapper.cs
- BlobPersonalizationState.cs
- HtmlMobileTextWriter.cs
- MobileCapabilities.cs
- assemblycache.cs
- DetailsView.cs
- TypeConverterAttribute.cs
- LogLogRecordHeader.cs
- ActiveXHelper.cs
- ConcurrentStack.cs
- ZipIOLocalFileHeader.cs
- FaultConverter.cs
- PackageDigitalSignature.cs
- SmiMetaData.cs
- serverconfig.cs
- AppDomainResourcePerfCounters.cs
- SQLGuidStorage.cs
- DataGridParentRows.cs
- UserControlAutomationPeer.cs
- TreeViewEvent.cs
- UserNameSecurityTokenAuthenticator.cs
- coordinatorfactory.cs
- ButtonChrome.cs
- BackgroundWorker.cs
- AffineTransform3D.cs
- TextTreePropertyUndoUnit.cs
- CrossAppDomainChannel.cs