[.NET] STAThread

在WindowForm应用程序中主要的线程，是采用一种称为「Single-Threaded Apartment(STA)」的线程模型。这个STA线程模型，在线程内加入了讯息帮浦等等机制，减少开发人员撰写窗口程序的工作量。相关的信息可以参考：[Object-oriented] 线程。

 

而在开发类别库的时候，如果要使用类似的STA线程模型，可以使用下列的程序代码提供的类别来完成。

 

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namespace CLK.Threading {     public class STAThread     {         // Enum         private enum ThreadState         {             Started,             Stopping,             Stopped,         }             // Fields         private readonly object _syncRoot = new object();           private readonly BlockingQueue<Action> _actionQueue = null;           private Thread _thread = null;           private ManualResetEvent _threadEvent = null;           private ThreadState _threadState = ThreadState.Stopped;                   // Constructor         public STAThread()         {             // ActionQueue             _actionQueue = new BlockingQueue<Action>();                                       // ThreadEvent             _threadEvent = new ManualResetEvent(true);               // ThreadState             _threadState = ThreadState.Stopped;               }             // Methods         public void Start()         {                        // Sync             lock (_syncRoot)             {                 // ThreadState                 if (_threadState != ThreadState.Stopped) throw new InvalidOperationException();                 _threadState = ThreadState.Started;             }               // Thread             _thread = new Thread(this.Operate);             _thread.Name = string.Format("Class:{0}, Id:{1}", "STAThread", _thread.ManagedThreadId);             _thread.IsBackground = false;             _thread.Start();         }           public void Stop()         {             // Sync             lock (_syncRoot)             {                 // ThreadState                 if (_threadState != ThreadState.Started) throw new InvalidOperationException();                 _threadState = ThreadState.Stopping;                   // ActionQueue                 _actionQueue.Release();             }               // Wait             _threadEvent.WaitOne();         }             public void Post(SendOrPostCallback callback, object state)         {             #region Contracts               if (callback == null) throw new ArgumentNullException();               #endregion                           // Action             Action action = delegate()             {                 try                 {                     callback(state);                 }                 catch (Exception ex)                 {                     Debug.Fail(string.Format("Delegate:{0}, State:{1}, Message:{2}", callback.GetType(), "Exception", ex.Message));                 }             };               // Sync             lock (_syncRoot)             {                 // ThreadState                 if (_threadState != ThreadState.Started) throw new InvalidOperationException();                   // ActionQueue                 _actionQueue.Enqueue(action);             }                               }           public void Send(SendOrPostCallback callback, object state)         {             #region Contracts               if (callback == null) throw new ArgumentNullException();               #endregion               // Action             ManualResetEvent actionEvent = new ManualResetEvent(false);             Action action = delegate()             {                 try                 {                     callback(state);                 }                 catch (Exception ex)                 {                     Debug.Fail(string.Format("Delegate:{0}, State:{1}, Message:{2}", callback.GetType(), "Exception", ex.Message));                 }                 finally                 {                     actionEvent.Set();                 }             };               // Sync             lock (_syncRoot)             {                 // ThreadState                 if (_threadState != ThreadState.Started) throw new InvalidOperationException();                   // ActionQueue                 if (Thread.CurrentThread != _thread)                 {                     _actionQueue.Enqueue(action);                 }             }               // Execute             if (Thread.CurrentThread == _thread)             {                 action();             }               // Wait             actionEvent.WaitOne();         }             private void Operate()         {             try             {                 // Begin                 _threadEvent.Reset();                   // Operate                 while (true)                 {                     // Action                     Action action = _actionQueue.Dequeue();                       // Execute                     if (action != null)                     {                         action();                     }                                                               // ThreadState                     if (action == null)                     {                         lock (_syncRoot)                         {                             if (_threadState == ThreadState.Stopping)                             {                                 return;                             }                         }                     }                 }             }             finally             {                 // End                 lock (_syncRoot)                 {                     _threadState = ThreadState.Stopped;                 }                 _threadEvent.Set();             }         }     } }

 

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namespace CLK.Threading {     public class BlockingQueue<T>     {         // Fields                private readonly object _syncRoot = new object();           private readonly WaitHandle[] _waitHandles = null;           private readonly Queue<T> _itemQueue = null;           private readonly Semaphore _itemQueueSemaphore = null;           private readonly ManualResetEvent _itemQueueReleaseEvent = null;             // Constructors         public BlockingQueue()         {             // Default             _itemQueue = new Queue<T>();             _itemQueueSemaphore = new Semaphore(0, int.MaxValue);             _itemQueueReleaseEvent = new ManualResetEvent(false);             _waitHandles = new WaitHandle[] { _itemQueueSemaphore, _itemQueueReleaseEvent };         }             // Methods         public void Enqueue(T item)         {             lock (_syncRoot)             {                 _itemQueue.Enqueue(item);                 _itemQueueSemaphore.Release();             }         }           public T Dequeue()         {             WaitHandle.WaitAny(_waitHandles);             lock (_syncRoot)             {                 if (_itemQueue.Count > 0)                 {                     return _itemQueue.Dequeue();                 }             }             return default(T);         }           public void Release()         {             lock (_syncRoot)             {                 _itemQueueReleaseEvent.Set();             }         }           public void Reset()         {             lock (_syncRoot)             {                 _itemQueue.Clear();                 _itemQueueSemaphore.Close();                 _itemQueueReleaseEvent.Reset();             }         }     } }