LocationReferenceValue.cs source code in C# .NET

Source code for the .NET framework in C#

                        

Code:

/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Expressions / LocationReferenceValue.cs / 1305376 / LocationReferenceValue.cs

                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities.Expressions 
{
    using System.Linq.Expressions; 
    using System.Runtime; 

    [Fx.Tag.XamlVisible(false)] 
    sealed class LocationReferenceValue : CodeActivity, IExpressionContainer
    {
        LocationReference locationReference;
 
        public LocationReferenceValue(LocationReference locationReference)
        { 
            this.locationReference = locationReference; 
        }
 
        public LocationReference LocationReference
        {
            get
            { 
                return this.locationReference;
            } 
        } 

        Expression IExpressionContainer.Expression 
        {
            get
            {
                return ExpressionUtilities.CreateIdentifierExpression(this.locationReference); 
            }
        } 
 
        protected override void CacheMetadata(CodeActivityMetadata metadata)
        { 
            // No-op
        }

        internal override bool TryGetValue(ActivityContext context, out T value) 
        {
            try 
            { 
                context.AllowChainedEnvironmentAccess = true;
 
                value = context.GetValue(this.locationReference);
            }
            finally
            { 
                context.AllowChainedEnvironmentAccess = false;
            } 
 
            return true;
        } 

        protected override T Execute(CodeActivityContext context)
        {
            return ExecuteWithTryGetValue(context); 
        }
    } 
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
                        

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