我如何知道我的異步方法已在WCF服務中完成？

我有一個WCF服務，並在我的Silverlight 4應用程序中使用它。我有5個異步調用。我怎麼知道他們已經完成了？我如何知道我的異步方法已在WCF服務中完成？

void service_StochSlowCompleted(object sender, StochSlowCompletedEventArgs e) 
    { 
     int count = e.Result.Count/2; 
     for (int i = 0; i < count; i++) 
     { 
      Stoch.Add(e.Result[i]); 
     } 
    } 

    void service_MovingAvgCompleted(object sender, MovingAvgCompletedEventArgs e) 
    { 
     MA = e.Result; 
    } 

    void service_MomentumCompleted(object sender, MomentumCompletedEventArgs e) 
    { 
     PMO = e.Result; 
    } 

    void service_RSICompleted(object sender, RSICompletedEventArgs e) 
    { 
     RSI = e.Result; 
    } 

    void service_OBVCompleted(object sender, OBVCompletedEventArgs e) 
    { 
     OBV = e.Result; 
    } 


public void Get_Data(ObservableCollection<double> high, ObservableCollection<double> low, ObservableCollection<double> open, ObservableCollection<double> close, ObservableCollection<double> volume, ObservableCollection<DateTime> date) 
    { 
     service.OBVAsync(0, close.Count - 1, close, volume); 
     service.RSIAsync(0, close.Count - 1, close, 9); 
     service.StochSlowAsync(0, close.Count - 1, high, low, close, 14, 3, 14); 
     service.MomentumAsync(0, close.Count - 1, close, 10); 
     service.MovingAvgAsync(0, close.Count - 1, close, 10); 

     Close = close; 
     Date = date; 

    } 
public void Predict() 
    { 
     //some code uses the results returned from the serivce 
    }

外，我有：

Prediction p = new Prediction(); 
p.Get_Data(high, low, open, close, volume, date); 
p.Predict();

所以..請我怎樣才能知道?????

來源

2011-09-13 Osama Jomaa

您應該將名爲Get_DataCompleted的事件添加到Prediction類。

當調用了所有的service_ * Comlpeted方法時引發此事件。爲此，您可以在方法末尾添加一個調用，以減少int，並在int = 0時調用Get_DataCompleted。在Get_Data開始時將int設置爲5。

時GET_DATA被調用，int是> 0您可能引發InvalidOperationException（或中止以前的調用，重新初始化，...）當Get_DataCompleted提高

呼叫p.Predict。

public event EventHandler Get_DataCompleted; 

private int pendingCalls; 

private void OnCompleted() 
{ 
    pendingCalls -= 1; 
    if (pendingCalls == 0 && Get_DataCompleted != null) 
    Get_DataCompleted(this, EventArgs.Empty); 
} 

void service_StochSlowCompleted(object sender, StochSlowCompletedEventArgs e) 
{ 
    int count = e.Result.Count/2; 
    for (int i = 0; i < count; i++) 
    { 
    Stoch.Add(e.Result[i]); 
    } 
    OnCompleted(); 
} 

void service_MovingAvgCompleted(object sender, MovingAvgCompletedEventArgs e) 
{ 
    MA = e.Result; 
    OnCompleted(); 
} 

void service_MomentumCompleted(object sender, MomentumCompletedEventArgs e) 
{ 
    PMO = e.Result; 
    OnCompleted(); 
} 

void service_RSICompleted(object sender, RSICompletedEventArgs e) 
{ 
    RSI = e.Result; 
    OnCompleted(); 
} 

void service_OBVCompleted(object sender, OBVCompletedEventArgs e) 
{ 
    OBV = e.Result; 
    OnCompleted(); 
} 


public void Get_Data(ObservableCollection<double> high, ObservableCollection<double> low, ObservableCollection<double> open, ObservableCollection<double> close, ObservableCollection<double> volume, ObservableCollection<DateTime> date) 
{ 
    if (pendingCalls > 0) 
    throw new InvalidOperationException(); 
    pendingCalls = 5; 
    service.OBVAsync(0, close.Count - 1, close, volume); 
    service.RSIAsync(0, close.Count - 1, close, 9); 
    service.StochSlowAsync(0, close.Count - 1, high, low, close, 14, 3, 14); 
    service.MomentumAsync(0, close.Count - 1, close, 10); 
    service.MovingAvgAsync(0, close.Count - 1, close, 10); 

    Close = close; 
    Date = date; 

} 
public void Predict() 
{ 
    //some code uses the results returned from the serivce 
}

外：

Prediction p = new Prediction(); 
    p.Get_Data(high, low, open, close, volume, date); 
    p.Get_DataCompleted += new EventHandler(p_Get_DataCompleted); 

void p_Get_DataCompleted(object sender, EventArgs e) 
{ 
    (sender as Prediction).Predict(); 
}

來源

2011-09-13 10:21:04 Guillaume

您好Guillaume .. thanx爲您的快速反應，但你可以請你提供我的代碼我怎麼可以做你提到的詭計？謝謝 –

完成後，代碼很髒，但你看到了訣竅。 – Guillaume

啊哈我看到了，非常感謝你的紀堯姆對你的幫助:) –

註冊回調，處理異步進程已完成的事實。

但是，不是「點燃和遺忘」的不同點嗎？如果你太依賴於回覆給調用者，也許你應該切換到同步調用並重新考慮你的設計。

來源

2011-09-13 10:17:38 duffymo

你不能總是對等維護同步調用。我不知道SL4，但在Windows Phone 7（基於SL2），只有異步可用。 – Guillaume

我如何知道我的異步方法已在WCF服務中完成？

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