ExistsInCollection.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 / Statements / ExistsInCollection.cs / 1305376 / ExistsInCollection.cs
                        

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

namespace System.Activities.Statements 
{
    using System; 
    using System.Collections.Generic; 
    using System.Collections.ObjectModel;
    using System.ComponentModel; 
    using System.Windows.Markup;
    using System.Diagnostics.CodeAnalysis;
    using System.Runtime;
 
    [SuppressMessage(FxCop.Category.Naming, FxCop.Rule.IdentifiersShouldNotHaveIncorrectSuffix, Justification = "Optimizing for XAML naming.")]
    [ContentProperty("Collection")] 
    public sealed class ExistsInCollection : CodeActivity 
    {
        [RequiredArgument] 
        [DefaultValue(null)]
        public InArgument> Collection
        {
            get; 
            set;
        } 
 
        [RequiredArgument]
        [DefaultValue(null)] 
        public InArgument Item
        {
            get;
            set; 
        }
 
        //override to no-op because of performance 
        protected override void CacheMetadata(CodeActivityMetadata metadata)
        { 
            RuntimeArgument collectionArgument = new RuntimeArgument("Collection", typeof(ICollection), ArgumentDirection.In, true);
            metadata.Bind(this.Collection, collectionArgument);

            RuntimeArgument itemArgument = new RuntimeArgument("Item", typeof(T), ArgumentDirection.In, true); 
            metadata.Bind(this.Item, itemArgument);
 
            metadata.SetArgumentsCollection( 
                new Collection
                { 
                    collectionArgument,
                    itemArgument,
                });
        } 

        protected override bool Execute(CodeActivityContext context) 
        { 
            ICollection collection = this.Collection.Get(context);
            if (collection == null) 
            {
                throw FxTrace.Exception.AsError(new InvalidOperationException(SR.CollectionActivityRequiresCollection(this.DisplayName)));
            }
            T item = this.Item.Get(context); 

            return collection.Contains(item); 
        } 
    }
} 

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

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