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/ 4.0 / 4.0 / untmp / 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.
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