66 lines
1.9 KiB
C#
66 lines
1.9 KiB
C#
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//----------------------------------------------------------------
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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;
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using System.Activities.Statements;
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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.Globalization;
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public sealed class ArrayItemValue<TItem> : CodeActivity<TItem>
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{
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public ArrayItemValue()
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: base()
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{
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}
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[RequiredArgument]
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[DefaultValue(null)]
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public InArgument<TItem[]> Array
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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<int> Index
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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 arrayArgument = new RuntimeArgument("Array", typeof(TItem[]), ArgumentDirection.In, true);
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metadata.Bind(this.Array, arrayArgument);
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RuntimeArgument indexArgument = new RuntimeArgument("Index", typeof(int), ArgumentDirection.In, true);
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metadata.Bind(this.Index, indexArgument);
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metadata.SetArgumentsCollection(
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new Collection<RuntimeArgument>
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{
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arrayArgument,
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indexArgument,
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});
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}
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protected override TItem Execute(CodeActivityContext context)
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{
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TItem[] items = this.Array.Get(context);
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if (items == null)
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{
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throw FxTrace.Exception.AsError(new InvalidOperationException(SR.MemberCannotBeNull("Array", this.GetType().Name, this.DisplayName)));
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}
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int itemIndex = this.Index.Get(context);
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return items[itemIndex];
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}
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}
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}
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