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
- GatewayIPAddressInformationCollection.cs
- HMACMD5.cs
- Font.cs
- ImageAttributes.cs
- Connection.cs
- ControlBuilder.cs
- BulletChrome.cs
- InvalidPropValue.cs
- MSG.cs
- Rfc2898DeriveBytes.cs
- MemberCollection.cs
- PtsHelper.cs
- SimpleHandlerFactory.cs
- StateMachine.cs
- HttpCacheVary.cs
- XmlSchemaAttributeGroup.cs
- TextElementAutomationPeer.cs
- OrderedEnumerableRowCollection.cs
- Version.cs
- OperationAbortedException.cs
- ListViewInsertionMark.cs
- dbdatarecord.cs
- FormattedText.cs
- MDIControlStrip.cs
- HttpCookiesSection.cs
- ProtocolsSection.cs
- WindowsAuthenticationEventArgs.cs
- ListViewItemSelectionChangedEvent.cs
- ReverseComparer.cs
- SocketException.cs
- METAHEADER.cs
- CommandDesigner.cs
- arc.cs
- XPathNodeList.cs
- RewritingProcessor.cs
- BrowserPolicyValidator.cs
- TextPatternIdentifiers.cs
- HelloOperationCD1AsyncResult.cs
- MsmqChannelFactoryBase.cs
- BindingList.cs
- Comparer.cs
- GenericEnumConverter.cs
- _ReceiveMessageOverlappedAsyncResult.cs
- PolygonHotSpot.cs
- RoutedCommand.cs
- TextFormatterContext.cs
- RsaKeyIdentifierClause.cs
- SingleObjectCollection.cs
- ApplicationSecurityInfo.cs
- DataServiceHostFactory.cs
- PKCS1MaskGenerationMethod.cs
- MetadataProperty.cs
- NTAccount.cs
- SystemIPGlobalStatistics.cs
- Evaluator.cs
- ValidationHelper.cs
- DurableInstanceProvider.cs
- ParseChildrenAsPropertiesAttribute.cs
- DetailsViewModeEventArgs.cs
- DocumentViewerConstants.cs
- HttpPostProtocolReflector.cs
- AddInPipelineAttributes.cs
- ProcessHostServerConfig.cs
- ObfuscationAttribute.cs
- ConnectionPoint.cs
- _NetworkingPerfCounters.cs
- RowVisual.cs
- MatrixTransform.cs
- XmlCustomFormatter.cs
- Query.cs
- WindowsHyperlink.cs
- TextWriterTraceListener.cs
- RectangleHotSpot.cs
- DataSourceNameHandler.cs
- NavigatingCancelEventArgs.cs
- DateTimeUtil.cs
- ToolStripCollectionEditor.cs
- ContextMenuAutomationPeer.cs
- OleDbConnectionInternal.cs
- Stylesheet.cs
- SRDisplayNameAttribute.cs
- MetafileHeader.cs
- PermissionRequestEvidence.cs
- ZipIORawDataFileBlock.cs
- RangeValueProviderWrapper.cs
- DataGridrowEditEndingEventArgs.cs
- SettingsPropertyValue.cs
- DbgUtil.cs
- TypeInitializationException.cs
- SelectionEditingBehavior.cs
- _NetRes.cs
- UnicastIPAddressInformationCollection.cs
- SemaphoreSecurity.cs
- SimpleApplicationHost.cs
- dbenumerator.cs
- InputScopeManager.cs
- HostingPreferredMapPath.cs
- SR.cs
- WebPartDisplayMode.cs
- EnumBuilder.cs