2011-04-01 110 views
1

A類包含變量A以保存在C類(doEvent())中觸發的事件的狀態。該線程休眠500毫秒,因爲它等待B類啓動事件,該事件將EventArg數據發送回C類並調用事件處理程序UpdateClassVar(EventArgs e) - 這就是它所等待的事件。C#.net事件處理程序代理問題

問題:如何使用Event Handler觸發依賴於狀態更新而不依賴於Thread.Sleep的類C(//執行某些操作)的下一步...?

免責聲明:考慮我是一個新手程序員。考慮這個我最好的嘗試和一個相當不雅的解決方案。請隨時重新設計和重新編碼,這應該被認爲是解決上述問題的唯一原型努力。

注意:代碼示例編輯爲實際應用的「真實世界」示例。 (未完全測試)

附加問題 - Thread.Sleep(400)在下面的示例中停止主線程...停止所有進程,儘管尋找替代方案,這是否甚至是一個可行的解決方案?

public class OrderA : ICurrencyOrder 
{ 
    private int _clid; 

    private string _status; 

    public int Clid 
    { 
     get { return _clid; } 

     set { _clid = value; } 
    } 

    public string Status 
    { 
     get { return _status; } 

     set { _status = value; } 
    } 

} 


Class B 
{ 

     // event delegate for UpdateOrder 

     public event UpdateOrderDelegate UpdateOrderEvent; 

     /* Code Here to receive and process order assign status etc */ 

     /* An Event Arguments (args) Class is created that hold e.Status and e.Clid values */ 

     UpdateOrder(args) 

     private void UpdateOrder(args) 
     { 
      if (UpdateOrderEvent != null) 
      { 
       UpdateOrderEvent(this, e); 
      } 
     } 

} 


// This is the class that initates the order (sendOrder()) and then waits for the 
// status of the order before processing the next step in the order process 
// which could be to send order again to exit 

Class C 
{ 
     // add event handler to update status and clid from Class B 

     UpdateOrderEvent += new UpdateOrderDelegate(UpdateOrdersListener); 

     public void EnterOrder(EnterEventArgs e) 
     { 

     // set connectinon to ICurrencyOrder class above OrderA 
     // this uses a switch statement (omitted) to use correct class (A, B, C etc). 

     ICurrencyOrder ordVals = Class A; 

     bool fill = false; 

     for (int i=0; i<5 && fill=false; i++) 
     { 
      sendOrder("Symbol", price, clid, etc) 

      Thread.Sleep(400); 

      if (ordVals.Clid = clid) // check to see if order was updated using client id 
      { 
       if (ordVals.Status = 'FILLED') 
       { 
        filled = true; 
       } 

      } 

     } // end for loop 

     } // end EnterOrder 

     private void UpdateOrdersListener(object sender, EventArgs e) 
     { 
      OrderUpdateEventArgs ev = (OrderUpdatEventArgs)e; 

      // set connection to appropriate class using switch (symbol) omitted 

      ICurrencyOrder ordVal = Class A; 

      ordVal.Status = e.Status; 

      ordVal.Clid = e.Clid; 

     } // end Class C 

回答

0

我認爲AutoResetEvent是你正在尋找的,如果你想等待的東西繼續做別的事情發生之前的類。

在課程描述頁面上提供了一個示例,基本上您可以撥打WaitOne您想要等待的地方,然後Set想要繼續。