RuntimeVariablesExpression.cs source code in C# .NET

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Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / Core / Microsoft / Scripting / Ast / RuntimeVariablesExpression.cs / 1305376 / RuntimeVariablesExpression.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 {
    ///  
    /// An expression that provides runtime read/write access to variables.
    /// Needed to implement "eval" in some dynamic languages. 
    /// Evaluates to an instance of  when executed. 
    /// 
#if !SILVERLIGHT 
    [DebuggerTypeProxy(typeof(Expression.RuntimeVariablesExpressionProxy))]
#endif
    public sealed class RuntimeVariablesExpression : Expression {
        private readonly ReadOnlyCollection _variables; 

        internal RuntimeVariablesExpression(ReadOnlyCollection variables) { 
            _variables = variables; 
        }
 
        /// 
        /// 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 typeof(IRuntimeVariables); } 
        } 

        ///  
        /// 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.RuntimeVariables; } 
        } 

        ///  
        /// The variables or parameters to which to provide runtime access.
        /// 
        public ReadOnlyCollection Variables {
            get { return _variables; } 
        }
 
        ///  
        /// Dispatches to the specific visit method for this node type.
        ///  
        protected internal override Expression Accept(ExpressionVisitor visitor) {
            return visitor.VisitRuntimeVariables(this);
        }
 
        /// 
        /// 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.
        ///  
        /// The  property of the result.
        /// This expression if no children changed, or an expression with the updated children.
        public RuntimeVariablesExpression Update(IEnumerable variables) {
            if (variables == Variables) { 
                return this;
            } 
            return Expression.RuntimeVariables(variables); 
        }
    } 

    public partial class Expression {

        ///  
        /// Creates an instance of .
        ///  
        /// An array of  objects to use to populate the  collection. 
        /// An instance of  that has the  property equal to  and the  property set to the specified value.
        public static RuntimeVariablesExpression RuntimeVariables(params ParameterExpression[] variables) { 
            return RuntimeVariables((IEnumerable)variables);
        }

        ///  
        /// Creates an instance of .
        ///  
        /// A collection of  objects to use to populate the  collection. 
        /// An instance of  that has the  property equal to  and the  property set to the specified value.
        public static RuntimeVariablesExpression RuntimeVariables(IEnumerable variables) { 
            ContractUtils.RequiresNotNull(variables, "variables");

            var vars = variables.ToReadOnly();
            for (int i = 0; i < vars.Count; i++) { 
                Expression v = vars[i];
                if (v == null) { 
                    throw new ArgumentNullException("variables[" + i + "]"); 
                }
            } 

            return new RuntimeVariablesExpression(vars);
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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