internal static void Analyze(MemberInitExpression mie, PathBox pb, DataServiceContext context) { ProjectionAnalyzer.EntityProjectionAnalyzer analyzer = new ProjectionAnalyzer.EntityProjectionAnalyzer(pb, mie.Type, context); MemberAssignmentAnalysis previous = null; foreach (MemberBinding binding in mie.Bindings) { MemberAssignment assignment = binding as MemberAssignment; analyzer.Visit(assignment.Expression); if (assignment != null) { MemberAssignmentAnalysis analysis2 = MemberAssignmentAnalysis.Analyze(pb.ParamExpressionInScope, assignment.Expression); if (analysis2.IncompatibleAssignmentsException != null) { throw analysis2.IncompatibleAssignmentsException; } Type memberType = ClientTypeUtil.GetMemberType(assignment.Member); Expression[] expressionsBeyondTargetEntity = analysis2.GetExpressionsBeyondTargetEntity(); if (expressionsBeyondTargetEntity.Length == 0) { throw new NotSupportedException(System.Data.Services.Client.Strings.ALinq_ExpressionNotSupportedInProjectionToEntity(memberType, assignment.Expression)); } MemberExpression expression = expressionsBeyondTargetEntity[expressionsBeyondTargetEntity.Length - 1] as MemberExpression; analysis2.CheckCompatibleAssignments(mie.Type, ref previous); if (expression != null) { if (expression.Member.Name != assignment.Member.Name) { throw new NotSupportedException(System.Data.Services.Client.Strings.ALinq_PropertyNamesMustMatchInProjections(expression.Member.Name, assignment.Member.Name)); } bool flag = ClientTypeUtil.TypeOrElementTypeIsEntity(memberType); if (ClientTypeUtil.TypeOrElementTypeIsEntity(expression.Type) && !flag) { throw new NotSupportedException(System.Data.Services.Client.Strings.ALinq_ExpressionNotSupportedInProjection(memberType, assignment.Expression)); } } } } }
/// <summary>Analyzes the specified member-init expression.</summary> /// <param name="mie">Expression to analyze.</param> /// <param name="pb">Path-tracking object to store analysis in.</param> /// <param name="context">Context of expression to analyze.</param> internal static void Analyze(MemberInitExpression mie, SelectExpandPathBuilder pb, DataServiceContext context) { Debug.Assert(mie != null, "mie != null"); var epa = new EntityProjectionAnalyzer(pb, mie.Type, context); MemberAssignmentAnalysis targetEntityPath = null; foreach (MemberBinding mb in mie.Bindings) { MemberAssignment ma = mb as MemberAssignment; epa.Visit(ma.Expression); if (ma != null) { var analysis = MemberAssignmentAnalysis.Analyze(pb.ParamExpressionInScope, ma.Expression); if (analysis.IncompatibleAssignmentsException != null) { throw analysis.IncompatibleAssignmentsException; } // Note that an "empty" assignment on the binding is not checked/handled, // because the funcletizer would have turned that into a constant // in the tree, the visit earlier in this method would have thrown // an exception at finding a constant in an entity projection. // // We do account however for failing to find a reference off the // parameter entry to detect errors like this: new ET() { Ref = e } // Here it looks like the new ET should be the parent of 'e', but // there is nothing in scope that represents that. // // This also explains while error messages might be a bit misleading // in this case (because they reference a constant when the user // hasn't included any). Type targetType = ClientTypeUtil.GetMemberType(ma.Member); Expression[] lastExpressions = analysis.GetExpressionsBeyondTargetEntity(); if (lastExpressions.Length == 0) { throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjectionToEntity(targetType, ma.Expression)); } MemberExpression lastExpression = lastExpressions[lastExpressions.Length - 1] as MemberExpression; Debug.Assert( !analysis.MultiplePathsFound, "!analysis.MultiplePathsFound -- the initilizer has been visited, and cannot be empty, and expressions that can combine paths should have thrown exception during initializer analysis"); #if DEBUG Debug.Assert( lastExpression != null, "lastExpression != null -- the initilizer has been visited, and cannot be empty, and the only expressions that are allowed can be formed off the parameter, so this is always correlatd"); #endif analysis.CheckCompatibleAssignments(mie.Type, ref targetEntityPath); // For DataServiceStreamLink, the last expression will be a constant expression. Hence we won't be comparing name checks and entity checks for those type of bindings if (lastExpression != null) { if (lastExpression.Member.Name != ma.Member.Name) { throw new NotSupportedException(Strings.ALinq_PropertyNamesMustMatchInProjections(lastExpression.Member.Name, ma.Member.Name)); } // Unless we're initializing an entity, we should not traverse into the parameter in scope. bool targetIsEntity = ClientTypeUtil.TypeOrElementTypeIsEntity(targetType); bool sourceIsEntity = ClientTypeUtil.TypeOrElementTypeIsEntity(lastExpression.Type); if (sourceIsEntity && !targetIsEntity) { throw new NotSupportedException(Strings.ALinq_ExpressionNotSupportedInProjection(targetType, ma.Expression)); } } } } }
private Expression RebindEntityMemberInit(MemberInitExpression init) { Expression[] expressionsToTargetEntity; Expression deepestEntry; Expression expectedParamTypeInScope; ParameterExpression expression5; ParameterExpression expression6; if (!this.pathBuilder.HasRewrites) { expressionsToTargetEntity = MemberAssignmentAnalysis.Analyze(this.pathBuilder.LambdaParameterInScope, ((MemberAssignment)init.Bindings[0]).Expression).GetExpressionsToTargetEntity(); } else { expressionsToTargetEntity = MemberAssignmentAnalysis.EmptyExpressionArray; } Expression parameterEntryInScope = this.pathBuilder.ParameterEntryInScope; List <string> list = new List <string>(); List <Func <object, object, Type, object> > list2 = new List <Func <object, object, Type, object> >(); Type type = init.NewExpression.Type; Expression expression2 = Expression.Constant(type, typeof(Type)); string[] names = (from e in expressionsToTargetEntity.Skip <Expression>(1) select((MemberExpression)e).Member.Name).ToArray <string>(); if (expressionsToTargetEntity.Length <= 1) { deepestEntry = this.pathBuilder.ParameterEntryInScope; expectedParamTypeInScope = this.pathBuilder.ExpectedParamTypeInScope; expression5 = (ParameterExpression)this.pathBuilder.ParameterEntryInScope; expression6 = (ParameterExpression)this.pathBuilder.ExpectedParamTypeInScope; } else { deepestEntry = this.GetDeepestEntry(expressionsToTargetEntity); expectedParamTypeInScope = expression2; expression5 = Expression.Parameter(typeof(object), "subentry" + this.identifierId++); expression6 = (ParameterExpression)this.pathBuilder.ExpectedParamTypeInScope; ProjectionPath path = new ProjectionPath((ParameterExpression)this.pathBuilder.LambdaParameterInScope, this.pathBuilder.ExpectedParamTypeInScope, this.pathBuilder.ParameterEntryInScope, expressionsToTargetEntity.Skip <Expression>(1)); ExpressionAnnotation annotation = new ExpressionAnnotation { Segment = path[path.Count - 1] }; this.annotations.Add(deepestEntry, annotation); ExpressionAnnotation annotation2 = new ExpressionAnnotation { Segment = path[path.Count - 1] }; this.annotations.Add(expression5, annotation2); this.pathBuilder.RegisterRewrite(this.pathBuilder.LambdaParameterInScope, names, expression5); } for (int i = 0; i < init.Bindings.Count; i++) { LambdaExpression expression7; MemberAssignment assignment = (MemberAssignment)init.Bindings[i]; list.Add(assignment.Member.Name); if (ClientTypeUtil.TypeOrElementTypeIsEntity(ClientTypeUtil.GetMemberType(assignment.Member)) && (assignment.Expression.NodeType == ExpressionType.MemberInit)) { ProjectionPath path2; ExpressionAnnotation annotation3; Expression expression8 = CallMaterializer("ProjectionGetEntry", new Expression[] { parameterEntryInScope, Expression.Constant(assignment.Member.Name, typeof(string)) }); ParameterExpression key = Expression.Parameter(typeof(object), "subentry" + this.identifierId++); if (this.annotations.TryGetValue(this.pathBuilder.ParameterEntryInScope, out annotation3)) { path2 = new ProjectionPath((ParameterExpression)this.pathBuilder.LambdaParameterInScope, this.pathBuilder.ExpectedParamTypeInScope, parameterEntryInScope); path2.AddRange(annotation3.Segment.StartPath); } else { path2 = new ProjectionPath((ParameterExpression)this.pathBuilder.LambdaParameterInScope, this.pathBuilder.ExpectedParamTypeInScope, parameterEntryInScope, expressionsToTargetEntity.Skip <Expression>(1)); } Type reflectedType = assignment.Member.ReflectedType; ProjectionPathSegment item = new ProjectionPathSegment(path2, assignment.Member.Name, reflectedType); path2.Add(item); string[] strArray2 = (from m in path2 where m.Member != null select m.Member).ToArray <string>(); ExpressionAnnotation annotation4 = new ExpressionAnnotation { Segment = item }; this.annotations.Add(key, annotation4); this.pathBuilder.RegisterRewrite(this.pathBuilder.LambdaParameterInScope, strArray2, key); Expression expression = this.Visit(assignment.Expression); this.pathBuilder.RevokeRewrite(this.pathBuilder.LambdaParameterInScope, strArray2); this.annotations.Remove(key); expression = Expression.Convert(expression, typeof(object)); ParameterExpression[] parameters = new ParameterExpression[] { this.materializerExpression, key, expression6 }; expression7 = Expression.Lambda(expression, parameters); Expression[] arguments = new Expression[] { this.materializerExpression, expression8, expression6 }; ParameterExpression[] expressionArray4 = new ParameterExpression[] { this.materializerExpression, (ParameterExpression)parameterEntryInScope, expression6 }; expression7 = Expression.Lambda(Expression.Invoke(expression7, arguments), expressionArray4); } else { Expression body = Expression.Convert(this.Visit(assignment.Expression), typeof(object)); ParameterExpression[] expressionArray5 = new ParameterExpression[] { this.materializerExpression, expression5, expression6 }; expression7 = Expression.Lambda(body, expressionArray5); } list2.Add((Func <object, object, Type, object>)expression7.Compile()); } for (int j = 1; j < expressionsToTargetEntity.Length; j++) { this.pathBuilder.RevokeRewrite(this.pathBuilder.LambdaParameterInScope, names); this.annotations.Remove(deepestEntry); this.annotations.Remove(expression5); } return(Expression.Convert(CallMaterializer("ProjectionInitializeEntity", new Expression[] { this.materializerExpression, deepestEntry, expectedParamTypeInScope, expression2, Expression.Constant(list.ToArray()), Expression.Constant(list2.ToArray()) }), type)); }