DefaultExpression.cs source code in C# .NET

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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  that represents the static type of the expression. 
        public sealed override Type Type {
            get { return _type; } 
        }

        /// 
        /// Returns the node type of this Expression. Extension nodes should return 
        /// ExpressionType.Extension when overriding this method.
        ///  
        /// The  of the expression. 
        public sealed override ExpressionType NodeType {
            get { return ExpressionType.Default; } 
        }

        /// 
        /// 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  that has the  property equal to 
        ///  and the  property set to .
        ///  
        public static DefaultExpression Empty() {
            return new DefaultExpression(typeof(void));
        }
 
        /// 
        /// Creates a  that has the  property set to the specified type. 
        ///  
        /// A  to set the  property equal to.
        ///  
        /// A  that has the  property equal to
        ///  and the  property set to the specified type.
        /// 
        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.

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