100 lines
3.0 KiB
C#
100 lines
3.0 KiB
C#
//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace System.Activities.Statements
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{
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using System.Activities;
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using System.Collections.Generic;
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using System.Collections.ObjectModel;
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using System.Runtime;
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using System.Windows.Markup;
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[ContentProperty("Body")]
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public sealed class HandleScope<THandle> : NativeActivity
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where THandle : Handle
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{
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Variable<THandle> declaredHandle;
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public HandleScope()
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{
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}
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public InArgument<THandle> Handle
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{
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get;
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set;
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}
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public Activity Body
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{
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get;
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set;
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}
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protected override void CacheMetadata(NativeActivityMetadata metadata)
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{
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RuntimeArgument handleArgument = new RuntimeArgument("Handle", typeof(THandle), ArgumentDirection.In);
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metadata.Bind(this.Handle, handleArgument);
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metadata.SetArgumentsCollection(new Collection<RuntimeArgument> { handleArgument });
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if (this.Body != null)
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{
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metadata.SetChildrenCollection(new Collection<Activity> { this.Body });
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}
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Collection<Variable> implementationVariables = null;
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if ((this.Handle == null) || this.Handle.IsEmpty)
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{
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if (this.declaredHandle == null)
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{
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this.declaredHandle = new Variable<THandle>();
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}
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}
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else
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{
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this.declaredHandle = null;
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}
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if (this.declaredHandle != null)
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{
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ActivityUtilities.Add(ref implementationVariables, this.declaredHandle);
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}
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metadata.SetImplementationVariablesCollection(implementationVariables);
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}
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protected override void Execute(NativeActivityContext context)
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{
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// We should go through the motions even if there is no Body for debugging
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// purposes. When testing handles people will probably use empty scopes
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// expecting everything except the Body execution to occur.
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Handle scopedHandle = null;
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if ((this.Handle == null) || this.Handle.IsEmpty)
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{
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Fx.Assert(this.declaredHandle != null, "We should have declared the variable if we didn't have the argument set.");
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scopedHandle = this.declaredHandle.Get(context);
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}
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else
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{
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scopedHandle = this.Handle.Get(context);
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}
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if (scopedHandle == null)
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{
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throw FxTrace.Exception.ArgumentNull("Handle");
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}
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context.Properties.Add(scopedHandle.ExecutionPropertyName, scopedHandle);
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if (this.Body != null)
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{
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context.ScheduleActivity(this.Body);
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}
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}
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}
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}
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