異步委託回調格局利用函數功能

我有異步代表其利用回調圖案的樣本代碼。我使用的是標準代表，下面的代碼工作正常。想要將其轉換爲Func委託（因爲它期待和int並返回一個int），但由於某種原因 - 似乎卡住了。有人可以請幫忙嗎？

class Program 
{ 
    public delegate int SomeDelegate(int x); 

    static void Main(string[] args) 
    { 
     Console.WriteLine("This is the CallBack Pattern Technique for Asynchronous Delegates in Threading"); 
     Console.WriteLine(""); 
     SomeDelegate sd = SquareNumber; 
     Console.WriteLine("[{0}] Before SquareNumber Method invoked.", Thread.CurrentThread.ManagedThreadId); 
     IAsyncResult asyncRes = sd.BeginInvoke(10, new AsyncCallback(CallbackMethod), null); 
     Console.WriteLine("[{0}] Back in Main after SquareNumber Method invoked. Doing Extra Processing.", Thread.CurrentThread.ManagedThreadId); 
     Console.WriteLine("[{0}] Main method processing completed.", Thread.CurrentThread.ManagedThreadId); 
     Console.ReadLine(); 
    } 

    static int SquareNumber(int a) 
    { 
     Console.WriteLine("[{0}] Inside SquareNumber - invoked. Processing......", Thread.CurrentThread.ManagedThreadId); 
     Thread.Sleep(5000); 
     return a * a; 
    } 

    static void CallbackMethod(IAsyncResult asyncRes) 
    { 
     Console.WriteLine("[{0}] Callback Invoked", Thread.CurrentThread.ManagedThreadId); 
     AsyncResult ares = (AsyncResult)asyncRes; 
     SomeDelegate delg = (SomeDelegate)ares.AsyncDelegate; 
     int res = delg.EndInvoke(asyncRes); 
     Console.WriteLine("[{1}] Result = {0}", res, Thread.CurrentThread.ManagedThreadId); 
    } 
}

感謝

來源

2013-05-02 Patrick

你已經發布了* does *工作的代碼，但沒有*不工作的代碼 - 這使得修復代碼無法工作的難度更大。 – 2013-05-02 14:46:43

Jon - 我正在學習更多關於通用Func和Action代表的知識，並希望在上面的上下文中使用它。似乎不能通過聲明Func代表的第一行 – Patrick 2013-05-02 14:48:01

因此，張貼代碼給你的問題。我們還沒有看到你所嘗試過的，所以我們看不出有什麼問題。 – 2013-05-02 14:49:22

class Program 
    { 
     //public delegate int SomeDelegate(int x); 

     static void Main(string[] args) 
     { 
      Console.WriteLine("This is the CallBack Pattern Technique for Asynchronous Delegates in Threading"); 
      Console.WriteLine(""); 
      Func<int,int> sd = SquareNumber; 
      Console.WriteLine("[{0}] Before SquareNumber Method invoked.", Thread.CurrentThread.ManagedThreadId); 
      IAsyncResult asyncRes = sd.BeginInvoke(10, new AsyncCallback(CallbackMethod), null); 
      Console.WriteLine("[{0}] Back in Main after SquareNumber Method invoked. Doing Extra Processing.", Thread.CurrentThread.ManagedThreadId); 
      Console.WriteLine("[{0}] Main method processing completed.", Thread.CurrentThread.ManagedThreadId); 
      Console.ReadLine(); 
     } 

     static int SquareNumber(int a) 
     { 
      Console.WriteLine("[{0}] Inside SquareNumber - invoked. Processing......", Thread.CurrentThread.ManagedThreadId); 
      Thread.Sleep(5000); 
      return a * a; 
     } 

     static void CallbackMethod(IAsyncResult asyncRes) 
     { 
      Console.WriteLine("[{0}] Callback Invoked", Thread.CurrentThread.ManagedThreadId); 
      AsyncResult ares = (AsyncResult)asyncRes; 
      Func<int,int> delg = (Func<int,int>)ares.AsyncDelegate; 
      int res = delg.EndInvoke(asyncRes); 
      Console.WriteLine("[{1}] Result = {0}", res, Thread.CurrentThread.ManagedThreadId); 
     } 
    }

爲我工作。

來源

2013-05-02 14:52:55 TheKingDave

謝謝 - 只是一個無賴。我沒有得到那麼容易的第二部分。感謝大家的幫助 – Patrick 2013-05-02 14:59:45

異步委託回調格局利用函數功能

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