最近在学习SharpDevelop源代码，看到一处访问文件的很有美感的代码，特此供大家一起分享：

public sealed class CallbackOnDispose : IDisposable    {        Action callback;                public CallbackOnDispose(Action callback)        {            if (callback == null)                throw new ArgumentNullException("callback");            this.callback = callback;        }                public void Dispose()        {            Action action = Interlocked.Exchange(ref callback, null);            if (action != null) {                action();                #if DEBUG                GC.SuppressFinalize(this);                #endif            }        }                #if DEBUG        ~CallbackOnDispose()        {            Debug.Fail("CallbackOnDispose was finalized without being disposed.");        }        #endif    }

　　此处定义一个实现IDisposable接口的回调方法的类。调用的时候如下：

using (LockPropertyFile())  {     using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write, FileShare.None)) 　　　　{         ms.WriteTo(fs);       } }

  

public static IDisposable LockPropertyFile()        {            Mutex mutex = new Mutex(false);            mutex.WaitOne();            return new CallbackOnDispose(                delegate {                    mutex.ReleaseMutex();                    mutex.Close();                });        }