122 lines
3.4 KiB
C#
122 lines
3.4 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.ObjectModel;
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using System.ComponentModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Linq.Expressions;
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using System.Runtime;
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using System.Windows.Markup;
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[SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldNotMatchKeywords, Justification = "Optimizing for XAML naming. VB imperative users will [] qualify (e.g. New [If])")]
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public sealed class If : NativeActivity
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{
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public If()
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: base()
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{
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}
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public If(Expression<Func<ActivityContext, bool>> condition)
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: this()
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{
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if (condition == null)
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{
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throw FxTrace.Exception.ArgumentNull("condition");
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}
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this.Condition = new InArgument<bool>(condition);
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}
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public If(Activity<bool> condition)
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: this()
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{
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if (condition == null)
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{
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throw FxTrace.Exception.ArgumentNull("condition");
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}
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this.Condition = new InArgument<bool>(condition);
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}
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public If(InArgument<bool> condition)
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: this()
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{
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if (condition == null)
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{
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throw FxTrace.Exception.ArgumentNull("condition");
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}
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this.Condition = condition;
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}
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[RequiredArgument]
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[DefaultValue(null)]
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public InArgument<bool> Condition
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{
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get;
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set;
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}
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[DefaultValue(null)]
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[DependsOn("Condition")]
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public Activity Then
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{
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get;
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set;
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}
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[DefaultValue(null)]
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[DependsOn("Then")]
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public Activity Else
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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 OnCreateDynamicUpdateMap(DynamicUpdate.NativeActivityUpdateMapMetadata metadata, Activity originalActivity)
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{
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metadata.AllowUpdateInsideThisActivity();
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}
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protected override void Execute(NativeActivityContext context)
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{
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if (Condition.Get(context))
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{
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if (Then != null)
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{
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context.ScheduleActivity(Then);
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}
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}
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else if (Else != null)
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{
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context.ScheduleActivity(Else);
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}
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}
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protected override void CacheMetadata(NativeActivityMetadata metadata)
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{
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RuntimeArgument conditionArgument = new RuntimeArgument("Condition", typeof(bool), ArgumentDirection.In, true);
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metadata.Bind(this.Condition, conditionArgument);
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metadata.SetArgumentsCollection(new Collection<RuntimeArgument> { conditionArgument });
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Collection<Activity> children = null;
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if (this.Then != null)
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{
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ActivityUtilities.Add(ref children, this.Then);
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}
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if (this.Else != null)
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{
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ActivityUtilities.Add(ref children, this.Else);
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}
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metadata.SetChildrenCollection(children);
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}
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}
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}
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