異步WCF服務，如何返回任何變量

Question

public int SendServiceCallFromAnotherClass() 
{ 
    client.SendCompleted += new EventHandler<SendCompletedEventArgs>(client_SendCompleted); 

    client.SendAsync(clientSettings); 

    //i have to return some int here from my service 
} 

void client_SendCompleted(object sender, SendCompletedEventArgs e) 
{ 
    //so here i have to return int variable from my SendServiceCallFromAnotherClass method 
} 

Answer 1

不能從發送完成回調，因爲它的簽名是由SendAsync參數委託（EventHandler<SendCompletedEventArgs>）定義返回的變量。你可以做的是調用其他一些方法來傳遞異步操作結果，你可以在e參數中找到它。