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
- WebPartActionVerb.cs
- GetPageNumberCompletedEventArgs.cs
- ClientFormsIdentity.cs
- MetadataUtil.cs
- ResourceReader.cs
- RTLAwareMessageBox.cs
- StrokeRenderer.cs
- WebServiceData.cs
- XmlWriterSettings.cs
- SerializerDescriptor.cs
- SqlDataSourceSelectingEventArgs.cs
- DelayDesigner.cs
- HandleExceptionArgs.cs
- EventDescriptor.cs
- UpWmlPageAdapter.cs
- EntityDesignPluralizationHandler.cs
- Signature.cs
- _OSSOCK.cs
- InspectionWorker.cs
- ResourceFallbackManager.cs
- ViewService.cs
- HandlerMappingMemo.cs
- UIElementCollection.cs
- Update.cs
- GeneralTransform.cs
- XmlUtil.cs
- SHA512Managed.cs
- TableParaClient.cs
- ConfigurationValues.cs
- CustomExpression.cs
- TemplateComponentConnector.cs
- IndexerNameAttribute.cs
- Rfc2898DeriveBytes.cs
- ScalarOps.cs
- SmtpMail.cs
- contentDescriptor.cs
- X509Certificate.cs
- GenericUriParser.cs
- PropertiesTab.cs
- TypeDependencyAttribute.cs
- RecognizerStateChangedEventArgs.cs
- Literal.cs
- BitmapEffectState.cs
- ComponentEditorPage.cs
- ServiceReference.cs
- NopReturnReader.cs
- EdmRelationshipRoleAttribute.cs
- PartialCachingAttribute.cs
- AggregationMinMaxHelpers.cs
- EmptyEnumerable.cs
- DataGridTable.cs
- TransformDescriptor.cs
- Blend.cs
- DataGridViewRowContextMenuStripNeededEventArgs.cs
- MouseWheelEventArgs.cs
- ProcessThreadCollection.cs
- DataBoundControl.cs
- OperatingSystem.cs
- Parser.cs
- CaseInsensitiveHashCodeProvider.cs
- Header.cs
- CorrelationTokenInvalidatedHandler.cs
- ManagementException.cs
- SqlParameter.cs
- _Semaphore.cs
- XmlSerializerSection.cs
- DiscreteKeyFrames.cs
- AppDomain.cs
- ParameterBinding.cs
- ToolStripOverflow.cs
- AddInActivator.cs
- DataControlFieldCell.cs
- CodeCastExpression.cs
- BamlCollectionHolder.cs
- FixedPageAutomationPeer.cs
- HostProtectionException.cs
- ApplicationException.cs
- WebPartMenu.cs
- CalendarSelectionChangedEventArgs.cs
- Camera.cs
- TextBoxBase.cs
- WebServiceParameterData.cs
- OleDbParameterCollection.cs
- QilLoop.cs
- DataDocumentXPathNavigator.cs
- SerializationEventsCache.cs
- DataBoundControl.cs
- AnnotationDocumentPaginator.cs
- CachingHintValidation.cs
- PtsHelper.cs
- ProfileModule.cs
- SortFieldComparer.cs
- EnterpriseServicesHelper.cs
- FontDriver.cs
- DebugView.cs
- ByteRangeDownloader.cs
- ScriptReferenceBase.cs
- HMAC.cs
- SettingsAttributes.cs
- AccessorTable.cs