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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