83 lines
2.7 KiB
C#
83 lines
2.7 KiB
C#
//----------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//----------------------------------------------------------------
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namespace System.Activities.Expressions
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{
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using System.Activities;
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using System.Activities.DynamicUpdate;
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using System.Activities.Statements;
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using System.ComponentModel;
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime;
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[SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldNotMatchKeywords, Justification = "Optimizing for XAML naming. VB imperative users will [] qualify (e.g. New [OrElse])")]
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public sealed class OrElse : Activity<bool>
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{
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public OrElse()
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: base()
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{
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this.Implementation =
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() =>
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{
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if (this.Left != null && this.Right != null)
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{
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return new If
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{
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Condition = this.Left,
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Then = new Assign<bool>
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{
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To = new OutArgument<bool>(context => this.Result.Get(context)),
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Value = true,
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},
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Else = new Assign<bool>
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{
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To = new OutArgument<bool>(context => this.Result.Get(context)),
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Value = new InArgument<bool>(this.Right)
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}
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};
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}
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else
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{
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return null;
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}
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};
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}
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[DefaultValue(null)]
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public Activity<bool> Left
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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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public Activity<bool> Right
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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(UpdateMapMetadata 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(ActivityMetadata metadata)
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{
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metadata.AddImportedChild(this.Left);
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metadata.AddImportedChild(this.Right);
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if (this.Left == null)
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{
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metadata.AddValidationError(SR.BinaryExpressionActivityRequiresArgument("Left", "OrElse", this.DisplayName));
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}
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if (this.Right == null)
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{
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metadata.AddValidationError(SR.BinaryExpressionActivityRequiresArgument("Right", "OrElse", this.DisplayName));
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}
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}
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}
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}
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