69 lines
2.3 KiB
C#
69 lines
2.3 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.Collections.Generic;
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using System.ComponentModel;
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using System.Windows.Markup;
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime;
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using System.Collections.ObjectModel;
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[SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldNotHaveIncorrectSuffix, Justification = "Optimizing for XAML naming.")]
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[ContentProperty("Collection")]
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public sealed class RemoveFromCollection<T> : CodeActivity<bool>
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{
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[RequiredArgument]
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[DefaultValue(null)]
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public InArgument<ICollection<T>> Collection
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{
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get;
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set;
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}
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[RequiredArgument]
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[DefaultValue(null)]
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public InArgument<T> Item
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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(CodeActivityMetadata metadata)
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{
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RuntimeArgument collectionArgument = new RuntimeArgument("Collection", typeof(ICollection<T>), ArgumentDirection.In, true);
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metadata.Bind(this.Collection, collectionArgument);
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RuntimeArgument itemArgument = new RuntimeArgument("Item", typeof(T), ArgumentDirection.In, true);
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metadata.Bind(this.Item, itemArgument);
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RuntimeArgument resultArgument = new RuntimeArgument("Result", typeof(bool), ArgumentDirection.Out);
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metadata.Bind(this.Result, resultArgument);
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metadata.SetArgumentsCollection(
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new Collection<RuntimeArgument>
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{
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collectionArgument,
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itemArgument,
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resultArgument
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});
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}
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protected override bool Execute(CodeActivityContext context)
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{
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ICollection<T> collection = this.Collection.Get(context);
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if (collection == null)
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{
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throw FxTrace.Exception.AsError(new InvalidOperationException(SR.CollectionActivityRequiresCollection(this.DisplayName)));
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}
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T item = this.Item.Get(context);
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return collection.Remove(item);
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}
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}
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}
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