OutArgument.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 / OutArgument.cs / 1305376 / OutArgument.cs

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

namespace System.Activities 
{
    using System; 
    using System.Activities.Expressions; 
    using System.Activities.Runtime;
    using System.Activities.XamlIntegration; 
    using System.Collections.Generic;
    using System.Collections.ObjectModel;
    using System.ComponentModel;
    using System.Linq.Expressions; 
    using System.Runtime;
    using System.Windows.Markup; 
    using System.Diagnostics.CodeAnalysis; 

    public abstract class OutArgument : Argument 
    {
        internal OutArgument()
        {
            this.Direction = ArgumentDirection.Out; 
        }
 
        [SuppressMessage(FxCop.Category.Design, FxCop.Rule.ConsiderPassingBaseTypesAsParameters, 
            Justification = "Subclass needed to enforce rules about which directions can be referenced.")]
        public static OutArgument CreateReference(OutArgument argumentToReference, string referencedArgumentName) 
        {
            if (argumentToReference == null)
            {
                throw FxTrace.Exception.ArgumentNull("argumentToReference"); 
            }
 
            if (string.IsNullOrEmpty(referencedArgumentName)) 
            {
                throw FxTrace.Exception.ArgumentNullOrEmpty("referencedArgumentName"); 
            }

            return (OutArgument)ActivityUtilities.CreateReferenceArgument(argumentToReference.ArgumentType, ArgumentDirection.Out, referencedArgumentName);
        } 

        [SuppressMessage(FxCop.Category.Design, FxCop.Rule.ConsiderPassingBaseTypesAsParameters, 
            Justification = "Subclass needed to enforce rules about which directions can be referenced.")] 
        public static OutArgument CreateReference(InOutArgument argumentToReference, string referencedArgumentName)
        { 
            if (argumentToReference == null)
            {
                throw FxTrace.Exception.ArgumentNull("argumentToReference");
            } 

            if (string.IsNullOrEmpty(referencedArgumentName)) 
            { 
                throw FxTrace.Exception.ArgumentNullOrEmpty("referencedArgumentName");
            } 

            // Note that we explicitly pass Out since we want an OutArgument created
            return (OutArgument)ActivityUtilities.CreateReferenceArgument(argumentToReference.ArgumentType, ArgumentDirection.Out, referencedArgumentName);
        } 
    }
 
    [ContentProperty("Expression")] 
    [TypeConverter(typeof(OutArgumentConverter))]
    [ValueSerializer(typeof(ArgumentValueSerializer))] 
    public sealed class OutArgument : OutArgument
    {
        public OutArgument(Variable variable)
            : this() 
        {
            if (variable != null) 
            { 
                this.Expression = new VariableReference { Variable = variable };
            } 
        }

        public OutArgument(DelegateArgument delegateArgument)
            : this() 
        {
            if (delegateArgument != null) 
            { 
                this.Expression = new DelegateArgumentReference { DelegateArgument = delegateArgument };
            } 
        }

        public OutArgument(Expression> expression)
            : this() 
        {
            if (expression != null) 
            { 
                this.Expression = new LambdaReference(expression);
            } 
        }

        public OutArgument(Activity> expression)
            : this() 
        {
            this.Expression = expression; 
        } 

        public OutArgument() 
            : base()
        {
            this.ArgumentType = typeof(T);
        } 

        [DefaultValue(null)] 
        public new Activity> Expression 
        {
            get; 
            set;
        }

        internal override ActivityWithResult ExpressionCore 
        {
            get 
            { 
                return this.Expression;
            } 
            set
            {
                if (value == null)
                { 
                    this.Expression = null;
                    return; 
                } 

                if (value is Activity>) 
                {
                    this.Expression = (Activity>)value;
                }
                else 
                {
                    // We do not verify compatibility here. We will do that 
                    // during CacheMetadata in Argument.Validate. 
                    this.Expression = new ActivityWithResultWrapper>(value);
                } 
            }
        }

        public static implicit operator OutArgument(Variable variable) 
        {
            return FromVariable(variable); 
        } 

        public static implicit operator OutArgument(DelegateArgument delegateArgument) 
        {
            return FromDelegateArgument(delegateArgument);
        }
 
        public static implicit operator OutArgument(Activity> expression)
        { 
            return FromExpression(expression); 
        }
 
        public static OutArgument FromVariable(Variable variable)
        {
            if (variable == null)
            { 
                throw FxTrace.Exception.ArgumentNull("variable");
            } 
            return new OutArgument(variable); 
        }
 
        public static OutArgument FromDelegateArgument(DelegateArgument delegateArgument)
        {
            if (delegateArgument == null)
            { 
                throw FxTrace.Exception.ArgumentNull("delegateArgument");
            } 
            return new OutArgument(delegateArgument); 
        }
 
        public static OutArgument FromExpression(Activity> expression)
        {
            if (expression == null)
            { 
                throw FxTrace.Exception.ArgumentNull("expression");
            } 
 
            return new OutArgument(expression);
        } 

        // Soft-Link: This method is referenced through reflection by
        // ExpressionUtilities.TryRewriteLambdaExpression.  Update that
        // file if the signature changes. 
        public new Location GetLocation(ActivityContext context)
        { 
            if (context == null) 
            {
                throw FxTrace.Exception.ArgumentNull("context"); 
            }

            ThrowIfNotInTree();
 
            return context.GetLocation(this.RuntimeArgument);
        } 
 
        // Soft-Link: This method is referenced through reflection by
        // ExpressionUtilities.TryRewriteLambdaExpression.  Update that 
        // file if the signature changes.
        public new T Get(ActivityContext context)
        {
            return Get(context); 
        }
 
        public void Set(ActivityContext context, T value) 
        {
            if (context == null) 
            {
                throw FxTrace.Exception.ArgumentNull("context");
            }
 
            ThrowIfNotInTree();
 
            context.SetValue(this, value); 
        }
 
        internal override Location CreateDefaultLocation()
        {
            return Argument.CreateLocation();
        } 

        internal override void Declare(LocationEnvironment targetEnvironment, ActivityInstance activityInstance) 
        { 
            targetEnvironment.DeclareTemporaryLocation>(this.RuntimeArgument, activityInstance, true);
        } 

        internal override bool TryPopulateValue(LocationEnvironment targetEnvironment, ActivityInstance targetActivityInstance, ActivityContext resolutionContext)
        {
            Fx.Assert(this.Expression != null, "This should only be called for non-empty bindings."); 

            Location argumentValue; 
            if (this.Expression.TryGetValue(resolutionContext, out argumentValue)) 
            {
                targetEnvironment.Declare(this.RuntimeArgument, argumentValue.CreateReference(true), targetActivityInstance); 
                return true;
            }
            else
            { 
                targetEnvironment.DeclareTemporaryLocation>(this.RuntimeArgument, targetActivityInstance, true);
                return false; 
            } 
        }
    } 
}


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

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