ArrayItemReference.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 / ArrayItemReference.cs / 1305376 / ArrayItemReference.cs
                        

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

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

    public sealed class ArrayItemReference : CodeActivity>
    { 
        public ArrayItemReference()
            : 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); 
 
            RuntimeArgument resultArgument = new RuntimeArgument("Result", typeof(Location), ArgumentDirection.Out);
            metadata.Bind(this.Result, resultArgument); 

            metadata.SetArgumentsCollection(
                new Collection
                { 
                    arrayArgument,
                    indexArgument, 
                    resultArgument 
                });
        } 

        protected override Location 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 new ArrayLocation(items, itemIndex);
        }

        [DataContract] 
        class ArrayLocation : Location
        { 
            [DataMember] 
            TItem[] array;
 
            [DataMember(EmitDefaultValue = false)]
            int index;

            public ArrayLocation(TItem[] array, int index) 
                : base()
            { 
                this.array = array; 
                this.index = index;
            } 

            public override TItem Value
            {
                get 
                {
                    return this.array[this.index]; 
                } 
                set
                { 
                    this.array[this.index] = value;
                }
            }
        } 
    }
} 

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

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