DelegateArgumentValue.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 / DelegateArgumentValue.cs / 1305376 / DelegateArgumentValue.cs
                        

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

namespace System.Activities.Expressions 
{
    using System.Linq.Expressions; 
    using System.Runtime; 
    using System.Windows.Markup;
 
    [ContentProperty("DelegateArgument")]
    public sealed class DelegateArgumentValue : CodeActivity, IExpressionContainer
    {
        public DelegateArgumentValue() 
            : base()
        { 
        } 

        public DelegateArgumentValue(DelegateArgument delegateArgument) 
            : this()
        {
            this.DelegateArgument = delegateArgument;
        } 

        public DelegateArgument DelegateArgument 
        { 
            get;
            set; 
        }

        Expression IExpressionContainer.Expression
        { 
            get
            { 
                return ExpressionUtilities.CreateIdentifierExpression(this.DelegateArgument); 
            }
        } 

        protected override void CacheMetadata(CodeActivityMetadata metadata)
        {
            if (this.DelegateArgument == null) 
            {
                metadata.AddValidationError(SR.DelegateArgumentMustBeSet); 
            } 
            else
            { 
                if (!this.DelegateArgument.IsInTree)
                {
                    metadata.AddValidationError(SR.DelegateArgumentMustBeReferenced(this.DelegateArgument.Name));
                } 

                if (!metadata.Environment.IsVisible(this.DelegateArgument)) 
                { 
                    metadata.AddValidationError(SR.DelegateArgumentNotVisible(this.DelegateArgument.Name));
                } 

                if (!(this.DelegateArgument is DelegateInArgument) && !TypeHelper.AreTypesCompatible(this.DelegateArgument.Type, typeof(T)))
                {
                    metadata.AddValidationError(SR.DelegateArgumentTypeInvalid(this.DelegateArgument, typeof(T), this.DelegateArgument.Type)); 
                }
            } 
        } 

        internal override bool TryGetValue(ActivityContext context, out T value) 
        {
            try
            {
                context.AllowChainedEnvironmentAccess = true; 
                value = context.GetValue((LocationReference)this.DelegateArgument);
            } 
            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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