Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataEntity / System / Data / Objects / ELinq / BindingContext.cs / 1305376 / BindingContext.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] //--------------------------------------------------------------------- using CqtExpression = System.Data.Common.CommandTrees.DbExpression; using LinqExpression = System.Linq.Expressions.Expression; using System.Linq.Expressions; using System.Collections.ObjectModel; using System.Linq; using System.Collections.Generic; using System.Data.Common.CommandTrees; using System.Data.Metadata.Edm; using System.Reflection; using System.Data.Common.EntitySql; using System.Diagnostics; using System.Data.Common; using System.Globalization; namespace System.Data.Objects.ELinq { ////// Class containing binding information for an expression converter (associating CQT bindings /// with LINQ lambda parameter or LINQ sub-expressions) /// ////// Usage pattern: /// internal sealed class BindingContext { private readonly Stack/// BindingContext context = ...; /// /// // translate a "Where" lamba expression input.Where(i => i.X > 2); /// LambdaExpression whereLambda = ...; /// CqtExpression inputCqt = Translate(whereLambda.Arguments[1]); /// CqtExpression inputBinding = CreateExpressionBinding(inputCqt).Var; /// /// // push the scope defined by the parameter /// context.PushBindingScope(new KeyValuePair{ParameterExpression, CqtExpression}(whereLambda.Parameters[0], inputBinding)); /// /// // translate the expression in this context /// CqtExpression result = Translate(whereLambda.Expression); /// /// // pop the scope /// context.PopBindingScope(); ///
///_scopes; /// /// Initialize a new binding context /// internal BindingContext() { _scopes = new Stack(); } /// /// Set up a new binding scope where parameter expressions map to their paired CQT expressions. /// /// DbExpression/LinqExpression binding internal void PushBindingScope(Binding binding) { _scopes.Push(binding); } ////// Removes a scope when leaving a particular sub-expression. /// ///Scope. internal void PopBindingScope() { _scopes.Pop(); } internal bool TryGetBoundExpression(Expression linqExpression, out CqtExpression cqtExpression) { cqtExpression = _scopes .Where(binding => binding.LinqExpression == linqExpression) .Select(binding => binding.CqtExpression) .FirstOrDefault(); return cqtExpression != null; } } ////// Class describing a LINQ parameter and its bound expression. For instance, in /// /// products.Select(p => p.ID) /// /// the 'products' query is the bound expression, and 'p' is the parameter. /// internal sealed class Binding { internal Binding(Expression linqExpression, CqtExpression cqtExpression) { EntityUtil.CheckArgumentNull(linqExpression, "linqExpression"); EntityUtil.CheckArgumentNull(cqtExpression, "cqtExpression"); LinqExpression = linqExpression; CqtExpression = cqtExpression; } internal readonly Expression LinqExpression; internal readonly CqtExpression CqtExpression; } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. //---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // // // @owner [....] //--------------------------------------------------------------------- using CqtExpression = System.Data.Common.CommandTrees.DbExpression; using LinqExpression = System.Linq.Expressions.Expression; using System.Linq.Expressions; using System.Collections.ObjectModel; using System.Linq; using System.Collections.Generic; using System.Data.Common.CommandTrees; using System.Data.Metadata.Edm; using System.Reflection; using System.Data.Common.EntitySql; using System.Diagnostics; using System.Data.Common; using System.Globalization; namespace System.Data.Objects.ELinq { ////// Class containing binding information for an expression converter (associating CQT bindings /// with LINQ lambda parameter or LINQ sub-expressions) /// ////// Usage pattern: /// internal sealed class BindingContext { private readonly Stack/// BindingContext context = ...; /// /// // translate a "Where" lamba expression input.Where(i => i.X > 2); /// LambdaExpression whereLambda = ...; /// CqtExpression inputCqt = Translate(whereLambda.Arguments[1]); /// CqtExpression inputBinding = CreateExpressionBinding(inputCqt).Var; /// /// // push the scope defined by the parameter /// context.PushBindingScope(new KeyValuePair{ParameterExpression, CqtExpression}(whereLambda.Parameters[0], inputBinding)); /// /// // translate the expression in this context /// CqtExpression result = Translate(whereLambda.Expression); /// /// // pop the scope /// context.PopBindingScope(); ///
///_scopes; /// /// Initialize a new binding context /// internal BindingContext() { _scopes = new Stack(); } /// /// Set up a new binding scope where parameter expressions map to their paired CQT expressions. /// /// DbExpression/LinqExpression binding internal void PushBindingScope(Binding binding) { _scopes.Push(binding); } ////// Removes a scope when leaving a particular sub-expression. /// ///Scope. internal void PopBindingScope() { _scopes.Pop(); } internal bool TryGetBoundExpression(Expression linqExpression, out CqtExpression cqtExpression) { cqtExpression = _scopes .Where(binding => binding.LinqExpression == linqExpression) .Select(binding => binding.CqtExpression) .FirstOrDefault(); return cqtExpression != null; } } ////// Class describing a LINQ parameter and its bound expression. For instance, in /// /// products.Select(p => p.ID) /// /// the 'products' query is the bound expression, and 'p' is the parameter. /// internal sealed class Binding { internal Binding(Expression linqExpression, CqtExpression cqtExpression) { EntityUtil.CheckArgumentNull(linqExpression, "linqExpression"); EntityUtil.CheckArgumentNull(cqtExpression, "cqtExpression"); LinqExpression = linqExpression; CqtExpression = cqtExpression; } internal readonly Expression LinqExpression; internal readonly CqtExpression CqtExpression; } } // 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
- CodeTypeParameterCollection.cs
- indexingfiltermarshaler.cs
- httpstaticobjectscollection.cs
- ExpressionBuilderCollection.cs
- XmlnsCompatibleWithAttribute.cs
- ScalarOps.cs
- _ConnectionGroup.cs
- LinkLabel.cs
- CellQuery.cs
- CatalogZoneBase.cs
- HtmlTableCellCollection.cs
- XmlSchemaSimpleTypeRestriction.cs
- VarInfo.cs
- WebServiceParameterData.cs
- OverflowException.cs
- PageParserFilter.cs
- AssertHelper.cs
- GridViewSelectEventArgs.cs
- XDeferredAxisSource.cs
- AccessViolationException.cs
- ContextMenu.cs
- FusionWrap.cs
- CodeCompileUnit.cs
- NameNode.cs
- AddressHeader.cs
- CompressEmulationStream.cs
- XmlDataDocument.cs
- WebPartConnectionsEventArgs.cs
- ContractReference.cs
- DbDataSourceEnumerator.cs
- DataGridViewSelectedCellsAccessibleObject.cs
- Sql8ConformanceChecker.cs
- GridEntryCollection.cs
- CallbackException.cs
- TraceUtils.cs
- TableRow.cs
- AccessDataSource.cs
- addressfiltermode.cs
- Margins.cs
- oledbmetadatacollectionnames.cs
- BCryptNative.cs
- ProviderBase.cs
- IOException.cs
- XmlQueryStaticData.cs
- ObjectFactoryCodeDomTreeGenerator.cs
- URIFormatException.cs
- ExtenderProviderService.cs
- DesignerTransaction.cs
- odbcmetadatacollectionnames.cs
- ServiceRoute.cs
- StorageEntitySetMapping.cs
- ParameterToken.cs
- FrameAutomationPeer.cs
- StreamReader.cs
- FixedSOMImage.cs
- DataGridItem.cs
- DateRangeEvent.cs
- Italic.cs
- ToolStripGrip.cs
- UserNamePasswordValidator.cs
- ListMarkerLine.cs
- Stack.cs
- XmlNotation.cs
- HttpListenerException.cs
- TemplateBindingExtensionConverter.cs
- StylusEventArgs.cs
- Configuration.cs
- TreeViewImageGenerator.cs
- Object.cs
- DataGridAutomationPeer.cs
- counter.cs
- IssuanceTokenProviderBase.cs
- COM2IProvidePropertyBuilderHandler.cs
- ConnectorMovedEventArgs.cs
- DiscardableAttribute.cs
- GlyphTypeface.cs
- TcpClientSocketManager.cs
- SafeBitVector32.cs
- WindowsGraphicsWrapper.cs
- PingReply.cs
- TrustLevelCollection.cs
- SimpleColumnProvider.cs
- ControlBindingsConverter.cs
- UpdatePanel.cs
- ProfileModule.cs
- SamlSubjectStatement.cs
- XamlReaderHelper.cs
- HitTestParameters3D.cs
- RowParagraph.cs
- ObjectDisposedException.cs
- CellLabel.cs
- RoleManagerSection.cs
- SQLInt16.cs
- Latin1Encoding.cs
- PreProcessInputEventArgs.cs
- ZipIOFileItemStream.cs
- RoleGroupCollection.cs
- RowUpdatedEventArgs.cs
- DataSetMappper.cs
- EnumMember.cs