139 lines
3.7 KiB
C#
139 lines
3.7 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;
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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.ComponentModel;
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using System.Linq.Expressions;
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using System.Windows.Markup;
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using System.Runtime;
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using System.Runtime.Collections;
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[ContentProperty("Cases")]
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public sealed class Switch<T> : NativeActivity
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{
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IDictionary<T, Activity> cases;
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public Switch()
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{
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}
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public Switch(Expression<Func<ActivityContext, T>> expression)
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: this()
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{
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if (expression == null)
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{
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throw FxTrace.Exception.ArgumentNull("expression");
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}
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this.Expression = new InArgument<T>(expression);
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}
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public Switch(Activity<T> expression)
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: this()
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{
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if (expression == null)
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{
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throw FxTrace.Exception.ArgumentNull("expression");
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}
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this.Expression = new InArgument<T>(expression);
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}
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public Switch(InArgument<T> expression)
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: this()
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{
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if (expression == null)
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{
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throw FxTrace.Exception.ArgumentNull("expression");
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}
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this.Expression = expression;
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}
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[RequiredArgument]
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[DefaultValue(null)]
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public InArgument<T> Expression
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{
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get;
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set;
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}
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public IDictionary<T, Activity> Cases
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{
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get
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{
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if (this.cases == null)
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{
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this.cases = new NullableKeyDictionary<T, Activity>();
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}
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return this.cases;
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}
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}
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[DefaultValue(null)]
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public Activity Default
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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 CacheMetadata(NativeActivityMetadata metadata)
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{
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RuntimeArgument expressionArgument = new RuntimeArgument("Expression", typeof(T), ArgumentDirection.In, true);
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metadata.Bind(Expression, expressionArgument);
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metadata.SetArgumentsCollection(new Collection<RuntimeArgument> { expressionArgument });
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Collection<Activity> children = new Collection<Activity>();
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foreach (Activity child in Cases.Values)
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{
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children.Add(child);
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}
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if (Default != null)
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{
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children.Add(Default);
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}
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metadata.SetChildrenCollection(children);
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}
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protected override void Execute(NativeActivityContext context)
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{
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T result = Expression.Get(context);
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Activity selection = null;
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if (!Cases.TryGetValue(result, out selection))
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{
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if (this.Default != null)
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{
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selection = this.Default;
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}
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else
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{
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if (TD.SwitchCaseNotFoundIsEnabled())
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{
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TD.SwitchCaseNotFound(this.DisplayName);
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}
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}
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}
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if (selection != null)
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{
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context.ScheduleActivity(selection);
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}
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}
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}
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}
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