Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / objectresult_tresulttype.cs / 1305376 / objectresult_tresulttype.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] // @backupowner [....] //--------------------------------------------------------------------- namespace System.Data.Objects { using System; using System.Collections; using System.Collections.Generic; using System.Collections.ObjectModel; using System.ComponentModel; using System.Data; using System.Data.Common; using System.Data.Metadata.Edm; using System.Data.Mapping; using System.Data.Objects.DataClasses; using System.Diagnostics; using System.Linq.Expressions; using System.Data.Common.Internal.Materialization; ////// This class implements IEnumerable of T and IDisposable. Instance of this class /// is returned from ObjectQuery<T>.Execute method. /// [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1710:IdentifiersShouldHaveCorrectSuffix")] public sealed class ObjectResult: ObjectResult, IEnumerable { private Shaper _shaper; private DbDataReader _reader; private readonly EntitySet _singleEntitySet; private readonly TypeUsage _resultItemType; private readonly bool _readerOwned; private IBindingList _cachedBindingList; internal ObjectResult(Shaper shaper, EntitySet singleEntitySet, TypeUsage resultItemType) : this(shaper, singleEntitySet, resultItemType, true) { } internal ObjectResult(Shaper shaper, EntitySet singleEntitySet, TypeUsage resultItemType, bool readerOwned) { _shaper = shaper; _reader = _shaper.Reader; _singleEntitySet = singleEntitySet; _resultItemType = resultItemType; _readerOwned = readerOwned; } private void EnsureCanEnumerateResults() { if (null == _shaper) { // Enumerating more than once is not allowed. throw EntityUtil.CannotReEnumerateQueryResults(); } } /// /// Returns an enumerator that iterates through the collection. /// public IEnumeratorGetEnumerator() { EnsureCanEnumerateResults(); Shaper shaper = _shaper; _shaper = null; IEnumerator result = shaper.GetEnumerator(); return result; } /// /// Performs tasks associated with freeing, releasing, or resetting resources. /// public override void Dispose() { DbDataReader reader = _reader; _reader = null; if (null != reader && _readerOwned) { reader.Dispose(); } if (_shaper != null) { // This case includes when the ObjectResult is disposed before it // created an ObjectQueryEnumeration; at this time, the connection can be released if (_shaper.Context != null && _readerOwned) { _shaper.Context.ReleaseConnection(); } _shaper = null; } } internal override IEnumerator GetEnumeratorInternal() { return ((IEnumerable)this).GetEnumerator(); } internal override IList GetIListSourceListInternal() { // You can only enumerate the query results once, and the creation of an ObjectView consumes this enumeration. // However, there are situations where setting the DataSource of a control can result in multiple calls to this method. // In order to enable this scenario and allow direct binding to the ObjectResult instance, // the ObjectView is cached and returned on subsequent calls to this method. if (_cachedBindingList == null) { EnsureCanEnumerateResults(); bool forceReadOnly = this._shaper.MergeOption == MergeOption.NoTracking; _cachedBindingList = ObjectViewFactory.CreateViewForQuery (this._resultItemType, this, this._shaper.Context, forceReadOnly, this._singleEntitySet); } return _cachedBindingList; } public override Type ElementType { get { return typeof(T); } } } } // 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
- Quaternion.cs
- MarkupExtensionParser.cs
- NavigationPropertyEmitter.cs
- OleDbSchemaGuid.cs
- DataServiceProcessingPipeline.cs
- SharedConnectionWorkflowTransactionService.cs
- RSAOAEPKeyExchangeDeformatter.cs
- Compiler.cs
- GeneralTransform2DTo3D.cs
- SafeMILHandleMemoryPressure.cs
- _HeaderInfo.cs
- GridViewCommandEventArgs.cs
- AvTrace.cs
- ConfigXmlComment.cs
- ExternalFile.cs
- SignatureDescription.cs
- MetaColumn.cs
- LeaseManager.cs
- AsyncParams.cs
- InvokePattern.cs
- HtmlProps.cs
- WebPart.cs
- DataGridViewCellLinkedList.cs
- DrawItemEvent.cs
- XmlNamespaceMappingCollection.cs
- XamlRtfConverter.cs
- BoundField.cs
- JsonMessageEncoderFactory.cs
- safelink.cs
- ImmutableObjectAttribute.cs
- ConfigurationException.cs
- TimelineGroup.cs
- TypeDefinition.cs
- SqlUdtInfo.cs
- FileLevelControlBuilderAttribute.cs
- QueryCorrelationInitializer.cs
- QilFunction.cs
- AssertFilter.cs
- WebPartTracker.cs
- ComponentResourceKeyConverter.cs
- Mutex.cs
- basevalidator.cs
- ListCommandEventArgs.cs
- ProxyWebPartManagerDesigner.cs
- LateBoundChannelParameterCollection.cs
- SHA512.cs
- StylusDownEventArgs.cs
- BitmapMetadataBlob.cs
- TreePrinter.cs
- SimpleBitVector32.cs
- SparseMemoryStream.cs
- SchemaElementDecl.cs
- PolyBezierSegment.cs
- RawStylusSystemGestureInputReport.cs
- PersistenceTypeAttribute.cs
- Catch.cs
- EdmFunction.cs
- ValueTable.cs
- BorderGapMaskConverter.cs
- PolyLineSegmentFigureLogic.cs
- ContextBase.cs
- ThemeDirectoryCompiler.cs
- DataRecordInfo.cs
- OdbcFactory.cs
- Receive.cs
- QilExpression.cs
- ThreadLocal.cs
- SymLanguageType.cs
- IriParsingElement.cs
- DateRangeEvent.cs
- RelOps.cs
- WebPartZone.cs
- Exceptions.cs
- AutomationEventArgs.cs
- XsltException.cs
- TileBrush.cs
- HuffCodec.cs
- HttpResponseMessageProperty.cs
- SchemaMapping.cs
- CancellationTokenRegistration.cs
- BitmapEffectDrawingContent.cs
- BuildResult.cs
- MailBnfHelper.cs
- AndCondition.cs
- ObjectRef.cs
- DllNotFoundException.cs
- MimeReflector.cs
- UrlAuthorizationModule.cs
- ImageConverter.cs
- BitmapCodecInfo.cs
- UrlAuthorizationModule.cs
- RijndaelManaged.cs
- MouseGestureValueSerializer.cs
- CodeMemberField.cs
- WindowsListViewItemCheckBox.cs
- ChannelManagerHelpers.cs
- ClientType.cs
- PlainXmlSerializer.cs
- CodeRegionDirective.cs
- OnOperation.cs