Code:
/ Dotnetfx_Vista_SP2 / Dotnetfx_Vista_SP2 / 8.0.50727.4016 / DEVDIV / depot / DevDiv / releases / Orcas / QFE / ndp / fx / src / DataWeb / Client / System / Data / Services / Client / ALinq / DataServiceQueryProvider.cs / 1 / DataServiceQueryProvider.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // //// Query Provider for Linq to URI translatation // // // @owner [....] //--------------------------------------------------------------------- namespace System.Data.Services.Client { using System; using System.Diagnostics; using System.Linq; using System.Linq.Expressions; using System.Reflection; ////// QueryProvider implementation /// internal sealed class DataServiceQueryProvider : IQueryProvider { ///DataServiceContext for query provider internal readonly DataServiceContext Context; ///Constructs a query provider based on the context passed in /// The context for the query provider internal DataServiceQueryProvider(DataServiceContext context) { this.Context = context; } #region IQueryProvider implementation ///Factory method for creating DataServiceOrderedQuery based on expression /// The expression for the new query ///new DataServiceQuery public IQueryable CreateQuery(Expression expression) { Util.CheckArgumentNull(expression, "expression"); Type et = TypeSystem.GetElementType(expression.Type); Type qt = typeof(DataServiceQuery<>.DataServiceOrderedQuery).MakeGenericType(et); object[] args = new object[] { expression, this }; ConstructorInfo ci = qt.GetConstructor( BindingFlags.NonPublic | BindingFlags.Instance, null, new Type[] { typeof(Expression), typeof(DataServiceQueryProvider) }, null); return (IQueryable)ci.Invoke(args); } ///Factory method for creating DataServiceOrderedQuery based on expression ///generic type /// The expression for the new query ///new DataServiceQuery public IQueryableCreateQuery (Expression expression) { Util.CheckArgumentNull(expression, "expression"); return new DataServiceQuery .DataServiceOrderedQuery(expression, this); } /// Creates and executes a DataServiceQuery based on the passed in expression /// The expression for the new query ///the results public object Execute(Expression expression) { Util.CheckArgumentNull(expression, "expression"); MethodInfo mi = typeof(DataServiceQueryProvider).GetMethod("ReturnSingleton", BindingFlags.NonPublic | BindingFlags.Instance); return mi.MakeGenericMethod(expression.Type).Invoke(this, new object[] { expression }); } ///Creates and executes a DataServiceQuery based on the passed in expression ///generic type /// The expression for the new query ///the results public TResult Execute(Expression expression) { Util.CheckArgumentNull(expression, "expression"); return ReturnSingleton (expression); } #endregion /// Creates and executes a DataServiceQuery based on the passed in expression which results a single value ///generic type /// The expression for the new query ///single valued results internal TElement ReturnSingleton(Expression expression) { IQueryable query = new DataServiceQuery .DataServiceOrderedQuery(expression, this); MethodCallExpression mce = expression as MethodCallExpression; Debug.Assert(mce != null, "mce != null"); SequenceMethod sequenceMethod; if (ReflectionUtil.TryIdentifySequenceMethod(mce.Method, out sequenceMethod)) { switch (sequenceMethod) { case SequenceMethod.Single: return query.AsEnumerable().Single(); case SequenceMethod.SingleOrDefault: return query.AsEnumerable().SingleOrDefault(); case SequenceMethod.First: return query.AsEnumerable().First(); case SequenceMethod.FirstOrDefault: return query.AsEnumerable().FirstOrDefault(); default: throw Error.MethodNotSupported(mce); } } // Should never get here - should be caught by expression compiler. Debug.Assert(false, "Not supported singleton operator not caught by Resource Binder"); throw Error.MethodNotSupported(mce); } /// Builds the Uri for the expression passed in. /// The expression to translate into a Uri ///the resulting Uri internal Uri Translate(Expression e) { // short cut analysis if just a resource set if (!(e is ResourceSetExpression)) { e = Evaluator.PartialEval(e); e = new ExpressionNormalizer().Visit(e); e = ResourceBinder.Bind(e); } string translation = UriWriter.Translate(this.Context, e); return Util.CreateUri(this.Context.BaseUriWithSlash, Util.CreateUri(translation, UriKind.Relative)); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // //// Query Provider for Linq to URI translatation // // // @owner [....] //--------------------------------------------------------------------- namespace System.Data.Services.Client { using System; using System.Diagnostics; using System.Linq; using System.Linq.Expressions; using System.Reflection; ////// QueryProvider implementation /// internal sealed class DataServiceQueryProvider : IQueryProvider { ///DataServiceContext for query provider internal readonly DataServiceContext Context; ///Constructs a query provider based on the context passed in /// The context for the query provider internal DataServiceQueryProvider(DataServiceContext context) { this.Context = context; } #region IQueryProvider implementation ///Factory method for creating DataServiceOrderedQuery based on expression /// The expression for the new query ///new DataServiceQuery public IQueryable CreateQuery(Expression expression) { Util.CheckArgumentNull(expression, "expression"); Type et = TypeSystem.GetElementType(expression.Type); Type qt = typeof(DataServiceQuery<>.DataServiceOrderedQuery).MakeGenericType(et); object[] args = new object[] { expression, this }; ConstructorInfo ci = qt.GetConstructor( BindingFlags.NonPublic | BindingFlags.Instance, null, new Type[] { typeof(Expression), typeof(DataServiceQueryProvider) }, null); return (IQueryable)ci.Invoke(args); } ///Factory method for creating DataServiceOrderedQuery based on expression ///generic type /// The expression for the new query ///new DataServiceQuery public IQueryableCreateQuery (Expression expression) { Util.CheckArgumentNull(expression, "expression"); return new DataServiceQuery .DataServiceOrderedQuery(expression, this); } /// Creates and executes a DataServiceQuery based on the passed in expression /// The expression for the new query ///the results public object Execute(Expression expression) { Util.CheckArgumentNull(expression, "expression"); MethodInfo mi = typeof(DataServiceQueryProvider).GetMethod("ReturnSingleton", BindingFlags.NonPublic | BindingFlags.Instance); return mi.MakeGenericMethod(expression.Type).Invoke(this, new object[] { expression }); } ///Creates and executes a DataServiceQuery based on the passed in expression ///generic type /// The expression for the new query ///the results public TResult Execute(Expression expression) { Util.CheckArgumentNull(expression, "expression"); return ReturnSingleton (expression); } #endregion /// Creates and executes a DataServiceQuery based on the passed in expression which results a single value ///generic type /// The expression for the new query ///single valued results internal TElement ReturnSingleton(Expression expression) { IQueryable query = new DataServiceQuery .DataServiceOrderedQuery(expression, this); MethodCallExpression mce = expression as MethodCallExpression; Debug.Assert(mce != null, "mce != null"); SequenceMethod sequenceMethod; if (ReflectionUtil.TryIdentifySequenceMethod(mce.Method, out sequenceMethod)) { switch (sequenceMethod) { case SequenceMethod.Single: return query.AsEnumerable().Single(); case SequenceMethod.SingleOrDefault: return query.AsEnumerable().SingleOrDefault(); case SequenceMethod.First: return query.AsEnumerable().First(); case SequenceMethod.FirstOrDefault: return query.AsEnumerable().FirstOrDefault(); default: throw Error.MethodNotSupported(mce); } } // Should never get here - should be caught by expression compiler. Debug.Assert(false, "Not supported singleton operator not caught by Resource Binder"); throw Error.MethodNotSupported(mce); } /// Builds the Uri for the expression passed in. /// The expression to translate into a Uri ///the resulting Uri internal Uri Translate(Expression e) { // short cut analysis if just a resource set if (!(e is ResourceSetExpression)) { e = Evaluator.PartialEval(e); e = new ExpressionNormalizer().Visit(e); e = ResourceBinder.Bind(e); } string translation = UriWriter.Translate(this.Context, e); return Util.CreateUri(this.Context.BaseUriWithSlash, Util.CreateUri(translation, UriKind.Relative)); } } } // 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
- SmiContext.cs
- DataControlField.cs
- SqlRowUpdatedEvent.cs
- ServiceObjectContainer.cs
- RegistrationServices.cs
- WebPartZoneCollection.cs
- ProcessModelInfo.cs
- InProcStateClientManager.cs
- MaterializeFromAtom.cs
- DataGridViewAutoSizeModeEventArgs.cs
- PrintingPermissionAttribute.cs
- SecurityKeyType.cs
- StylusCaptureWithinProperty.cs
- ProgressBar.cs
- XmlUtil.cs
- DetailsViewAutoFormat.cs
- InvalidDocumentContentsException.cs
- LingerOption.cs
- AppDomainGrammarProxy.cs
- EntityClassGenerator.cs
- WebConfigurationFileMap.cs
- HttpClientCertificate.cs
- LaxModeSecurityHeaderElementInferenceEngine.cs
- CompletedAsyncResult.cs
- SurrogateChar.cs
- GeometryGroup.cs
- DataGridViewButtonColumn.cs
- DynamicMethod.cs
- UpdateExpressionVisitor.cs
- ZipPackage.cs
- WebPartsPersonalization.cs
- CompositeDuplexBindingElement.cs
- MethodAccessException.cs
- GridViewRow.cs
- VariableModifiersHelper.cs
- CompositeFontFamily.cs
- ListItem.cs
- PolicyLevel.cs
- SerializableAttribute.cs
- __FastResourceComparer.cs
- HtmlHistory.cs
- TypeUsage.cs
- ProfileEventArgs.cs
- GrammarBuilderBase.cs
- X509SecurityToken.cs
- MemberHolder.cs
- odbcmetadatacolumnnames.cs
- HttpContextBase.cs
- TemplateControl.cs
- SrgsElementList.cs
- NonSerializedAttribute.cs
- WebHttpBinding.cs
- BasicBrowserDialog.cs
- DataSourceDesigner.cs
- KeyboardNavigation.cs
- XmlReflectionImporter.cs
- _TransmitFileOverlappedAsyncResult.cs
- UserControl.cs
- RadialGradientBrush.cs
- InsufficientMemoryException.cs
- TextServicesManager.cs
- InvokePatternIdentifiers.cs
- DataPagerFieldItem.cs
- PropertyMapper.cs
- MergeFailedEvent.cs
- LogSwitch.cs
- Keywords.cs
- ContentTextAutomationPeer.cs
- storepermissionattribute.cs
- SchemaCollectionCompiler.cs
- EditingMode.cs
- DataGridViewCellPaintingEventArgs.cs
- AttributeInfo.cs
- StructuredTypeEmitter.cs
- X500Name.cs
- QilLoop.cs
- Schema.cs
- CodeSnippetCompileUnit.cs
- LogEntrySerializationException.cs
- XsltQilFactory.cs
- CodeArgumentReferenceExpression.cs
- DataPager.cs
- SlipBehavior.cs
- SymmetricKey.cs
- MenuItem.cs
- FormsAuthenticationUserCollection.cs
- _SafeNetHandles.cs
- ProxyWebPartManager.cs
- LostFocusEventManager.cs
- ConfigurationSectionGroup.cs
- DebugHandleTracker.cs
- TextEditorTyping.cs
- HandleValueEditor.cs
- DocumentSequenceHighlightLayer.cs
- RowBinding.cs
- SiteMapDataSourceView.cs
- Matrix3DStack.cs
- Line.cs
- SolidColorBrush.cs
- ObjectFactoryCodeDomTreeGenerator.cs