ArgumentReference.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 / ArgumentReference.cs / 1305376 / ArgumentReference.cs
                        

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

namespace System.Activities.Expressions 
{
    using System.Collections.Generic; 
    using System.Linq.Expressions; 
    using System.Runtime;
    using System.Windows.Markup; 

    public sealed class ArgumentReference : CodeActivity>
    {
        RuntimeArgument targetArgument; 

        public ArgumentReference() 
        { 
        }
 
        public ArgumentReference(string argumentName)
        {
            this.ArgumentName = argumentName;
        } 

        public string ArgumentName 
        { 
            get;
            set; 
        }

        protected override void CacheMetadata(CodeActivityMetadata metadata)
        { 
            this.targetArgument = null;
 
            if (string.IsNullOrEmpty(this.ArgumentName)) 
            {
                metadata.AddValidationError(SR.ArgumentNameRequired); 
            }
            else
            {
                this.targetArgument = ActivityUtilities.FindArgument(this.ArgumentName, this); 

                if (this.targetArgument == null) 
                { 
                    metadata.AddValidationError(SR.ArgumentNotFound(this.ArgumentName));
                } 
                else if (this.targetArgument.Type != typeof(T))
                {
                    metadata.AddValidationError(SR.ArgumentTypeMustBeCompatible(this.ArgumentName, this.targetArgument.Type, typeof(T)));
                } 
            }
        } 
 
        public override string ToString()
        { 
            if (!string.IsNullOrEmpty(this.ArgumentName))
            {
                return this.ArgumentName;
            } 

            return base.ToString(); 
        } 

        internal override bool TryGetValue(ActivityContext context, out Location value) 
        {
            try
            {
                context.AllowChainedEnvironmentAccess = true; 
                value = context.GetLocation(this.targetArgument);
            } 
            finally 
            {
                context.AllowChainedEnvironmentAccess = false; 
            }

            return true;
        } 

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

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

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK