SafeCancelMibChangeNotify.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 / Net / System / Net / NetworkInformation / SafeCancelMibChangeNotify.cs / 1305376 / SafeCancelMibChangeNotify.cs
                        

                        
                            using System; 
using System.Security;
using Microsoft.Win32.SafeHandles;

namespace System.Net.NetworkInformation 
{
    // This class guarantees that any in-progress notifications will be canceled before the AppDomain gets unloaded. 
    // CancelMibChangeNotify2 guarantees that after it returns, the callback will NEVER be called.  It may block 
    // for a small amount of time if the callback is currently in progress, which is fine (and, intentional).
 
    [SuppressUnmanagedCodeSecurity]
    internal class SafeCancelMibChangeNotify : SafeHandleZeroOrMinusOneIsInvalid
    {
        public SafeCancelMibChangeNotify() : base(true) { } 

        protected override bool ReleaseHandle() 
        { 
            uint err = UnsafeNetInfoNativeMethods.CancelMibChangeNotify2(base.handle);
            base.handle = IntPtr.Zero; 
            return (err == UnsafeNclNativeMethods.ErrorCodes.ERROR_SUCCESS);
        }
    }
} 

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.

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