InOutArgument.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / InOutArgument.cs / 1305376 / InOutArgument.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//-----------------------------------------------------------------------------

namespace System.Activities 
{
    using System; 
    using System.Activities.Expressions; 
    using System.Activities.XamlIntegration;
    using System.Activities.Runtime; 
    using System.ComponentModel;
    using System.Diagnostics.CodeAnalysis;
    using System.Linq.Expressions;
    using System.Runtime; 
    using System.Windows.Markup;
 
    public abstract class InOutArgument : Argument 
    {
        internal InOutArgument() 
        {
            this.Direction = ArgumentDirection.InOut;
        }
 
        [SuppressMessage(FxCop.Category.Design, FxCop.Rule.ConsiderPassingBaseTypesAsParameters,
            Justification = "Subclass needed to enforce rules about which directions can be referenced.")] 
        public static InOutArgument CreateReference(InOutArgument argumentToReference, string referencedArgumentName) 
        {
            if (argumentToReference == null) 
            {
                throw FxTrace.Exception.ArgumentNull("argumentToReference");
            }
 
            if (string.IsNullOrEmpty(referencedArgumentName))
            { 
                throw FxTrace.Exception.ArgumentNullOrEmpty("referencedArgumentName"); 
            }
 
            return (InOutArgument)ActivityUtilities.CreateReferenceArgument(argumentToReference.ArgumentType, ArgumentDirection.InOut, referencedArgumentName);
        }
    }
 
    [ContentProperty("Expression")]
    [TypeConverter(typeof(InOutArgumentConverter))] 
    [ValueSerializer(typeof(ArgumentValueSerializer))] 
    public sealed class InOutArgument : InOutArgument
    { 
        public InOutArgument(Variable variable)
            : this()
        {
            if (variable != null) 
            {
                this.Expression = new VariableReference { Variable = variable }; 
            } 
        }
 
        public InOutArgument(Variable variable)
            : this()
        {
            if (variable != null) 
            {
                this.Expression = new VariableReference { Variable = variable }; 
            } 
        }
 
        public InOutArgument(Expression> expression)
            : this()
        {
            if (expression != null) 
            {
                this.Expression = new LambdaReference(expression); 
            } 
        }
 
        public InOutArgument(Activity> expression)
            : this()
        {
            this.Expression = expression; 
        }
 
        public InOutArgument() 
            : 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; 
                }
 
                Activity> typedActivity = value as Activity>; 

                if (typedActivity != null) 
                {
                    this.Expression = typedActivity;
                }
                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 InOutArgument(Variable variable) 
        {
            return FromVariable(variable); 
        } 

        public static implicit operator InOutArgument(Activity> expression) 
        {
            return FromExpression(expression);
        }
 
        [SuppressMessage(FxCop.Category.Design, FxCop.Rule.ConsiderPassingBaseTypesAsParameters,
            Justification = "Generic needed for type inference")] 
        public static InOutArgument FromVariable(Variable variable) 
        {
            return new InOutArgument 
            {
                Expression = new VariableReference { Variable = variable }
            };
        } 

        public static InOutArgument FromExpression(Activity> expression) 
        { 
            if (expression == null)
            { 
                throw FxTrace.Exception.ArgumentNull("expression");
            }

            return new InOutArgument 
            {
                Expression = 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, false); 
        }
 
        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(false), targetActivityInstance);
                return true; 
            }
            else
            {
                targetEnvironment.DeclareTemporaryLocation>(this.RuntimeArgument, targetActivityInstance, false); 
                return false;
            } 
        } 
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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InOutArgument.cs source code in C# .NET

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