CancellableEnumerable.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 / fx / src / Core / System / Linq / Parallel / Utils / CancellableEnumerable.cs / 1305376 / CancellableEnumerable.cs

                            // ==++== 
//
//   Copyright (c) Microsoft Corporation.  All rights reserved.
//
// ==--== 
// =+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+=+
// 
// CancellableEnumerable.cs 
//
// [....] 
//
// =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

using System; 
using System.Collections.Generic;
using System.Linq; 
using System.Text; 
using System.Threading;
using System.Linq.Parallel; 

namespace System.Linq.Parallel
{
    internal static class CancellableEnumerable 
    {
        ///  
        /// Wraps an enumerable with a cancellation checker. The enumerator handed out by the source enumerable 
        /// will be wrapped by an object that periodically checks whether a particular cancellation token has
        /// been cancelled. If so, the next call to MoveNext() will throw an OperationCancelledException. 
        /// 
        internal static IEnumerable Wrap(IEnumerable source, CancellationToken token)
        {
            int count = 0; 
            foreach (TElement element in source)
            { 
                if ((count++ & CancellationState.POLL_INTERVAL) == 0) 
                    CancellationState.ThrowIfCanceled(token);
 
                yield return element;
            }
        }
    } 
}

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

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