ArrayItemValue.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / NetFx40 / System.Activities / System / Activities / Expressions / ArrayItemValue.cs / 1305376 / ArrayItemValue.cs
                        

                        
                            //---------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------

namespace System.Activities.Expressions 
{
    using System; 
    using System.Activities.Statements; 
    using System.Collections.Generic;
    using System.Collections.ObjectModel; 
    using System.ComponentModel;
    using System.Globalization;

    public sealed class ArrayItemValue : CodeActivity 
    {
        public ArrayItemValue() 
            : base() 
        {
        } 

        [RequiredArgument]
        [DefaultValue(null)]
        public InArgument Array 
        {
            get; 
            set; 
        }
 
        [RequiredArgument]
        [DefaultValue(null)]
        public InArgument Index
        { 
            get;
            set; 
        } 

        protected override void CacheMetadata(CodeActivityMetadata metadata) 
        {
            RuntimeArgument arrayArgument = new RuntimeArgument("Array", typeof(TItem[]), ArgumentDirection.In, true);
            metadata.Bind(this.Array, arrayArgument);
 
            RuntimeArgument indexArgument = new RuntimeArgument("Index", typeof(int), ArgumentDirection.In, true);
            metadata.Bind(this.Index, indexArgument); 
 
            metadata.SetArgumentsCollection(
                new Collection 
                {
                    arrayArgument,
                    indexArgument,
                }); 
        }
 
        protected override TItem Execute(CodeActivityContext context) 
        {
            TItem[] items = this.Array.Get(context); 
            if (items == null)
            {
                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.MemberCannotBeNull("Array", this.GetType().Name, this.DisplayName)));
            } 

            int itemIndex = this.Index.Get(context); 
            return items[itemIndex]; 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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