InArgument.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 / InArgument.cs / 1305376 / InArgument.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.ComponentModel;
    using System.Linq.Expressions;
    using System.Runtime; 
    using System.Windows.Markup;
    using System.Diagnostics.CodeAnalysis; 
 
    public abstract class InArgument : Argument
    { 
        internal InArgument()
            : base()
        {
            this.Direction = ArgumentDirection.In; 
        }
 
        [SuppressMessage(FxCop.Category.Design, FxCop.Rule.ConsiderPassingBaseTypesAsParameters, 
            Justification = "Subclass needed to enforce rules about which directions can be referenced.")]
        public static InArgument CreateReference(InArgument argumentToReference, string referencedArgumentName) 
        {
            if (argumentToReference == null)
            {
                throw FxTrace.Exception.ArgumentNull("argumentToReference"); 
            }
 
            if (string.IsNullOrEmpty(referencedArgumentName)) 
            {
                throw FxTrace.Exception.ArgumentNullOrEmpty("referencedArgumentName"); 
            }

            return (InArgument)ActivityUtilities.CreateReferenceArgument(argumentToReference.ArgumentType, ArgumentDirection.In, referencedArgumentName);
        } 

        [SuppressMessage(FxCop.Category.Design, FxCop.Rule.ConsiderPassingBaseTypesAsParameters, 
            Justification = "Subclass needed to enforce rules about which directions can be referenced.")] 
        public static InArgument 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 In since we want an InArgument created
            return (InArgument)ActivityUtilities.CreateReferenceArgument(argumentToReference.ArgumentType, ArgumentDirection.In, referencedArgumentName);
        } 
    }
 
    [ContentProperty("Expression")] 
    [TypeConverter(typeof(InArgumentConverter))]
    [ValueSerializer(typeof(ArgumentValueSerializer))] 
    public sealed class InArgument : InArgument
    {
        public InArgument(Variable variable)
            : this() 
        {
            if (variable != null) 
            { 
                this.Expression = new VariableValue { Variable = variable };
            } 
        }

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

        public InArgument(T constValue)
            : this() 
        {
            this.Expression = new Literal { Value = constValue }; 
        } 

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

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

 
        public InArgument() 
            : 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 InArgument(Variable variable)
        {
            return FromVariable(variable); 
        }
 
        public static implicit operator InArgument(DelegateArgument delegateArgument) 
        {
            return FromDelegateArgument(delegateArgument); 
        }

        public static implicit operator InArgument(Activity expression)
        { 
            return FromExpression(expression);
        } 
 
        public static implicit operator InArgument(T constValue)
        { 
            return FromValue(constValue);
        }

        public static InArgument FromVariable(Variable variable) 
        {
            if (variable == null) 
            { 
                throw FxTrace.Exception.ArgumentNull("variable");
            } 
            return new InArgument(variable);
        }

        public static InArgument FromDelegateArgument(DelegateArgument delegateArgument) 
        {
            if (delegateArgument == null) 
            { 
                throw FxTrace.Exception.ArgumentNull("delegateArgument");
            } 
            return new InArgument(delegateArgument);
        }

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

            return new InArgument(expression);
        }
 
        public static InArgument FromValue(T constValue)
        { 
            return new InArgument 
                {
                    Expression = new Literal { Value = constValue } 
                };
        }

        // 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"); 
            }
 
            context.SetValue(this, value);
        }

        internal override Location CreateDefaultLocation() 
        {
            return Argument.CreateLocation(); 
        } 

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

            Location location = Argument.CreateLocation(); 
            targetEnvironment.Declare(this.RuntimeArgument, location, activityInstance);
 
            T argumentValue; 
            if (this.Expression.TryGetValue(resolutionContext, out argumentValue))
            { 
                location.Value = argumentValue;
                return true;
            }
            else 
            {
                return false; 
            } 
        }
 
        internal override void Declare(LocationEnvironment targetEnvironment, ActivityInstance targetActivityInstance)
        {
            targetEnvironment.Declare(this.RuntimeArgument, CreateDefaultLocation(), targetActivityInstance);
        } 
    }
} 

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

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