Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Ast / MemberInitExpression.cs / 1305376 / MemberInitExpression.cs
/* **************************************************************************** * * Copyright (c) Microsoft Corporation. * * This source code is subject to terms and conditions of the Microsoft Public License. A * copy of the license can be found in the License.html file at the root of this distribution. If * you cannot locate the Microsoft Public License, please send an email to * dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound * by the terms of the Microsoft Public License. * * You must not remove this notice, or any other, from this software. * * * ***************************************************************************/ using System.Collections.Generic; using System.Collections.ObjectModel; using System.Diagnostics; using System.Dynamic.Utils; using System.Runtime.CompilerServices; namespace System.Linq.Expressions { ////// Represents calling a constructor and initializing one or more members of the new object. /// #if !SILVERLIGHT [DebuggerTypeProxy(typeof(Expression.MemberInitExpressionProxy))] #endif public sealed class MemberInitExpression : Expression { private readonly NewExpression _newExpression; private readonly ReadOnlyCollection_bindings; internal MemberInitExpression(NewExpression newExpression, ReadOnlyCollection bindings) { _newExpression = newExpression; _bindings = bindings; } /// /// Gets the static type of the expression that this ///represents. /// The public sealed override Type Type { get { return _newExpression.Type; } } ///that represents the static type of the expression. /// Gets a value that indicates whether the expression tree node can be reduced. /// public override bool CanReduce { get { return true; } } ////// Returns the node type of this Expression. Extension nodes should return /// ExpressionType.Extension when overriding this method. /// ///The public sealed override ExpressionType NodeType { get { return ExpressionType.MemberInit; } } ///of the expression. Gets the expression that represents the constructor call. ///A public NewExpression NewExpression { get { return _newExpression; } } ///that represents the constructor call. Gets the bindings that describe how to initialize the members of the newly created object. ///A public ReadOnlyCollectionof objects which describe how to initialize the members. Bindings { get { return _bindings; } } /// /// Dispatches to the specific visit method for this node type. /// protected internal override Expression Accept(ExpressionVisitor visitor) { return visitor.VisitMemberInit(this); } ////// Reduces the ///to a simpler expression. /// If CanReduce returns true, this should return a valid expression. /// This method is allowed to return another node which itself /// must be reduced. /// The reduced expression. public override Expression Reduce() { return ReduceMemberInit(_newExpression, _bindings, true); } internal static Expression ReduceMemberInit(Expression objExpression, ReadOnlyCollectionbindings, bool keepOnStack) { var objVar = Expression.Variable(objExpression.Type, null); int count = bindings.Count; var block = new Expression[count + 2]; block[0] = Expression.Assign(objVar, objExpression); for (int i = 0; i < count; i++) { block[i + 1] = ReduceMemberBinding(objVar, bindings[i]); } block[count + 1] = keepOnStack ? (Expression)objVar : Expression.Empty(); return Expression.Block(new TrueReadOnlyCollection (block)); } internal static Expression ReduceListInit(Expression listExpression, ReadOnlyCollection initializers, bool keepOnStack) { var listVar = Expression.Variable(listExpression.Type, null); int count = initializers.Count; var block = new Expression[count + 2]; block[0] = Expression.Assign(listVar, listExpression); for (int i = 0; i < count; i++) { ElementInit element = initializers[i]; block[i + 1] = Expression.Call(listVar, element.AddMethod, element.Arguments); } block[count + 1] = keepOnStack ? (Expression)listVar : Expression.Empty(); return Expression.Block(new TrueReadOnlyCollection (block)); } internal static Expression ReduceMemberBinding(ParameterExpression objVar, MemberBinding binding) { MemberExpression member = Expression.MakeMemberAccess(objVar, binding.Member); switch (binding.BindingType) { case MemberBindingType.Assignment: return Expression.Assign(member, ((MemberAssignment)binding).Expression); case MemberBindingType.ListBinding: return ReduceListInit(member, ((MemberListBinding)binding).Initializers, false); case MemberBindingType.MemberBinding: return ReduceMemberInit(member, ((MemberMemberBinding)binding).Bindings, false); default: throw ContractUtils.Unreachable; } } /// /// Creates a new expression that is like this one, but using the /// supplied children. If all of the children are the same, it will /// return this expression. /// /// Theproperty of the result. /// The property of the result. /// This expression if no children changed, or an expression with the updated children. public MemberInitExpression Update(NewExpression newExpression, IEnumerablebindings) { if (newExpression == NewExpression && bindings == Bindings) { return this; } return Expression.MemberInit(newExpression, bindings); } } public partial class Expression { /// Creates a ///. A ///Athat has the property equal to and the and properties set to the specified values. to set the property equal to. ///An array of objects to use to populate the collection. /// /// ///or is null. The public static MemberInitExpression MemberInit(NewExpression newExpression, params MemberBinding[] bindings) { return MemberInit(newExpression, (IEnumerableproperty of an element of does not represent a member of the type that .Type represents. )bindings); } /// Creates a ///. A ///Athat has the property equal to and the and properties set to the specified values. to set the property equal to. ///An that contains objects to use to populate the collection. /// /// ///or is null. The public static MemberInitExpression MemberInit(NewExpression newExpression, IEnumerableproperty of an element of does not represent a member of the type that .Type represents. bindings) { ContractUtils.RequiresNotNull(newExpression, "newExpression"); ContractUtils.RequiresNotNull(bindings, "bindings"); var roBindings = bindings.ToReadOnly(); ValidateMemberInitArgs(newExpression.Type, roBindings); return new MemberInitExpression(newExpression, roBindings); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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