AppDomainShutdownMonitor.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 / wpf / src / Shared / MS / Internal / AppDomainShutdownMonitor.cs / 1305600 / AppDomainShutdownMonitor.cs
                        

                        
                            //---------------------------------------------------------------------------- 
//
// 
//    Copyright (C) Microsoft Corporation.  All rights reserved.
//  
//
// Description: 
//      Implement IAddDomainShutdownListener and use AppDomainShutdownMonitor 
//      to know when the AppDomain is going down
// 
//---------------------------------------------------------------------------

using System;
using System.Diagnostics;           // Assert 
using System.Collections.Generic;   // Dictionary
using System.Threading;             // [ThreadStatic] 
 
namespace MS.Internal
{ 
    internal interface IAppDomainShutdownListener
    {
        void NotifyShutdown();
    } 

    internal static class AppDomainShutdownMonitor 
    { 
        static AppDomainShutdownMonitor()
        { 
            AppDomain.CurrentDomain.DomainUnload += OnShutdown;
            AppDomain.CurrentDomain.ProcessExit += OnShutdown;

            _dictionary = new Dictionary(); 
        }
 
        public static void Add(WeakReference listener) 
        {
            Debug.Assert(listener.Target != null); 
            Debug.Assert(listener.Target is IAppDomainShutdownListener);

            lock (_dictionary)
            { 
                if (!_shuttingDown)
                { 
                    _dictionary.Add(listener, listener); 
                }
            } 
        }

        public static void Remove(WeakReference listener)
        { 
            Debug.Assert(listener.Target == null || listener.Target is IAppDomainShutdownListener);
 
            lock (_dictionary) 
            {
                if (!_shuttingDown) 
                {
                    _dictionary.Remove(listener);
                }
            } 
        }
 
        private static void OnShutdown(object sender, EventArgs e) 
        {
            lock (_dictionary) 
            {
                // Setting this to true prevents Add and Remove from modifying the list. This
                // way we call out without holding a lock (which would be bad)
                _shuttingDown = true; 
            }
 
            foreach (WeakReference value in _dictionary.Values) 
            {
                IAppDomainShutdownListener listener = value.Target as IAppDomainShutdownListener; 
                if (listener != null)
                {
                    listener.NotifyShutdown();
                } 
            }
        } 
 
        private static Dictionary _dictionary;
        private static bool _shuttingDown; 
    }
}

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

Link Menu

Network programming in C#, Network Programming in VB.NET, Network Programming in .NET
This book is available now!
Buy at Amazon US or
Buy at Amazon UK