UWP Wcf如果调用两次服务调用异步失败

Question

我不明白的事情发生在我的逻辑中，我没有收到任何期望，但我的应用程序锁定了。

代码：

ChatClient Service = new ChatClient(); 
    public MainPage() 
    { 
     this.InitializeComponent(); 
    } 

    private void button_Click(object sender, RoutedEventArgs e) 
    { 
     var temp = Service.AuthenicateAsync(T1.Text, T2.Text).Result; 
    } 

ChatClient代码：

public User Authenicate(string username, string password) 
    { 
     Clock.Restart(); 

     var User = new User(); 
     var Valid = false; 

     try 
     { 

      var VerificationQuery = Provider.CreateAdoCommand("select count(AccessToken) as 'Verified' from Users where Email=@user and Password=@pass;", Provider.CreateParameter("@user", DbType.String), Provider.CreateParameter("@pass", DbType.String)); 
      var reader1 = VerificationQuery.ExecuteReader(username, password); 
      using (reader1.Open()) 
      {//Check to see if the username and password is valid 
       while (reader1.MoveNext()) 
       { 
        if (reader1.GetInt32("Verified").Value == 1) 
        { 
         Valid = true; 
        } 
       } 
      } 

      if (Valid) 
      { 
       var TokenQuery = Provider.CreateAdoCommand("select AccessToken, Timeout from Users where Email=@user and Password=@pass", Provider.CreateParameter("@user", DbType.String), Provider.CreateParameter("@pass", DbType.String)); 
       var reader2 = TokenQuery.ExecuteReader(username, password); 
       using (reader2.Open()) 
       {//If the username and password is valid, retrieve the token and timeout period 
        while (reader2.MoveNext()) 
        { 
         User.AccessToken = reader2.GetString("AccessToken"); 
         User.TimeoutPeriod = reader2.GetDateTime("Timeout").Value; 
        } 
       } 

       //Check to see how old the timeout period is 
       var timeSub = User.TimeoutPeriod.Subtract(DateTime.Now); 
       if (timeSub.Days < 2) 
       { 
        //The token is too old, update the token, old token and timeout period 
        var TokenUpdateQuery = Provider.CreateAdoCommand("update Users set AccessToken=(NEWID()), OldAccessToken=@oldToken, Timeout=@newTime", Provider.CreateParameter("@oldToken", DbType.String), Provider.CreateParameter("@newTime", DbType.Date)); 
        using (TokenUpdateQuery.Open()) 
        { 
         TokenUpdateQuery.ExecuteNonQuery(User.AccessToken, DateTime.Now.AddDays(30)); 
        } 

        var FinalQuery = Provider.CreateAdoCommand("select AccessToken, Timeout from Users where Email=@user and Password=@pass", Provider.CreateParameter("@user", DbType.String), Provider.CreateParameter("@pass", DbType.String)); 
        var reader3 = FinalQuery.ExecuteReader(username, password); 
        using (reader3.Open()) 
        { 
         while (reader3.MoveNext()) 
         { 
          User.AccessToken = reader3.GetString("AccessToken"); 
          User.TimeoutPeriod = reader3.GetDateTime("Timeout").Value; 
         } 
        } 
       } 

       //Database Query for user information 
       var UserQuery = Provider.CreateAdoCommand("select FirstName, LastName, Email, DateCreated, AccessToken, OldAccessToken, Timeout, ConnectionId from [Users] where AccessToken=@token;", Provider.CreateParameter("@token", DbType.String)); 
       var reader4 = UserQuery.ExecuteReader(User.AccessToken); 

       using (reader4.Open()) 
       { 
        while (reader4.MoveNext()) 
        { 
         if (reader4.GetString("AccessToken").Equals(User.AccessToken)) 
         { 
          User.FirstName = reader4.GetString("FirstName"); 
          User.LastName = reader4.GetString("LastName"); 
          User.Email = reader4.GetString("Email"); 
          User.AccessToken = reader4.GetString("AccessToken"); 
          User.OldAccessToken = reader4.GetString("OldAccessToken"); 
          User.TimeoutPeriod = reader4.GetDateTime("Timeout").Value; 
          User.DateCreated = reader4.GetDateTime("DateCreated").Value; 
          User.ConnectionId = reader4.GetString("ConnectionId"); 
         } 
        } 
       } 
      } 
     } 
     catch (Exception) 
     { 

     } 

     Clock.Stop(); 
     User.SecondsProcessed = Clock.Elapsed.TotalSeconds; 
     return User; 

    } 

服务是托管这是使用Visual Studio中添加我的Web服务器上的WCF服务。在我的应用程序中，我有两个文本框和一个按钮。点击该按钮激发此方法。它第一次工作。第二次点击它，并在断点后点击var temp ...但是然后就会退出，我的应用程序被锁定。

Answer 1

我真的无法解释它。但改变方法看起来像这样的作品。我的意思是我可以，因为Async方法被调用，你需要等待它来获取数据。因此，需要将async关键字添加到方法中。

private async void button_Click(object sender, RoutedEventArgs e) 
    { 
     var temp = await Service.AuthenicateAsync("", ""); 
    }