Code:
/ Net / Net / 3.5.50727.3053 / DEVDIV / depot / DevDiv / releases / whidbey / netfxsp / 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
- PreloadHost.cs
- PhoneCallDesigner.cs
- Soap.cs
- SmtpSpecifiedPickupDirectoryElement.cs
- DataGridViewAutoSizeModeEventArgs.cs
- TraceData.cs
- XPathNodePointer.cs
- HtmlEncodedRawTextWriter.cs
- CodeStatementCollection.cs
- Int32Rect.cs
- CharStorage.cs
- MenuItemStyle.cs
- ConfigurationManagerHelper.cs
- InstanceCreationEditor.cs
- ListViewSortEventArgs.cs
- ObjectFactoryCodeDomTreeGenerator.cs
- PrintPageEvent.cs
- ForeignConstraint.cs
- XmlSerializationReader.cs
- ProfileServiceManager.cs
- WebPartCatalogAddVerb.cs
- WindowsListViewItemCheckBox.cs
- DataGridViewTextBoxEditingControl.cs
- SortQuery.cs
- AlphabeticalEnumConverter.cs
- EntityDataSourceWrapperCollection.cs
- PrefixQName.cs
- GenericIdentity.cs
- AudioStateChangedEventArgs.cs
- CodeLinePragma.cs
- HtmlInputReset.cs
- SqlOuterApplyReducer.cs
- RC2.cs
- GAC.cs
- XmlSchemaObjectCollection.cs
- TrackingProfileManager.cs
- Font.cs
- RecordManager.cs
- WorkflowApplicationUnloadedException.cs
- MenuEventArgs.cs
- ThemeDirectoryCompiler.cs
- MetadataStore.cs
- FileIOPermission.cs
- ClientTargetSection.cs
- sqlmetadatafactory.cs
- PaperSize.cs
- ObjectDisposedException.cs
- UserUseLicenseDictionaryLoader.cs
- CursorConverter.cs
- BaseCollection.cs
- HtmlLink.cs
- CornerRadius.cs
- Geometry3D.cs
- ValidateNames.cs
- NTAccount.cs
- DragDropHelper.cs
- ProcessingInstructionAction.cs
- configsystem.cs
- MultiTargetingUtil.cs
- FormatException.cs
- Vector3DKeyFrameCollection.cs
- DelegatingTypeDescriptionProvider.cs
- TypeReference.cs
- FontConverter.cs
- AVElementHelper.cs
- XPathAncestorIterator.cs
- DesignerValidatorAdapter.cs
- Clock.cs
- DataBoundLiteralControl.cs
- MeasureItemEvent.cs
- KnownTypeHelper.cs
- DocumentXPathNavigator.cs
- BreakRecordTable.cs
- ProtocolsConfigurationEntry.cs
- VersionPair.cs
- TCPClient.cs
- TextElementEnumerator.cs
- StrongNameSignatureInformation.cs
- Quaternion.cs
- TimeSpanOrInfiniteConverter.cs
- XpsResourceDictionary.cs
- TextTreeNode.cs
- CacheDependency.cs
- LineMetrics.cs
- CodeGen.cs
- TypedReference.cs
- XmlDigitalSignatureProcessor.cs
- WSDualHttpBinding.cs
- StateElementCollection.cs
- ListMarkerLine.cs
- StateMachineDesignerPaint.cs
- DataGridLinkButton.cs
- LifetimeServices.cs
- PropertyGridView.cs
- AnchoredBlock.cs
- SettingsPropertyWrongTypeException.cs
- DictionaryEntry.cs
- BitmapCache.cs
- XmlSchemaSimpleType.cs
- FormViewPageEventArgs.cs