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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Ast / DefaultExpression.cs / 1305376 / DefaultExpression.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.Diagnostics; namespace System.Linq.Expressions { ////// Represents the default value of a type or an empty expression. /// #if !SILVERLIGHT [DebuggerTypeProxy(typeof(Expression.DefaultExpressionProxy))] #endif public sealed class DefaultExpression : Expression { private readonly Type _type; internal DefaultExpression(Type type) { _type = type; } ////// Gets the static type of the expression that this ///represents. /// The public sealed override Type Type { get { return _type; } } ///that represents the static type of the expression. /// 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.Default; } } ///of the expression. /// Dispatches to the specific visit method for this node type. /// protected internal override Expression Accept(ExpressionVisitor visitor) { return visitor.VisitDefault(this); } } public partial class Expression { ////// Creates an empty expression that has ///type. /// /// A public static DefaultExpression Empty() { return new DefaultExpression(typeof(void)); } ///that has the property equal to /// and the property set to . /// /// Creates a /// Athat has the property set to the specified type. /// to set the property equal to. /// /// A public static DefaultExpression Default(Type type) { if (type == typeof(void)) { return Empty(); } return new DefaultExpression(type); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.that has the property equal to /// and the property set to the specified type. ///
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