如何向通用Windows应用程序添加异常处理消息？

我正在尝试将相应消息框的异常处理添加到通用Windows应用程序。我只想使用TryParse或Try-Catch，但我无法弄清楚在通用Windows应用程序中与消息框等效的内容。我现在不特别担心它的美学，只要我做的事符合UWP标准，所以我不会陷入前进的坏习惯。如何向通用Windows应用程序添加异常处理消息？

这里是我的C＃：

double INCHES = 1; 
    double FEET = 12; 
    double YARDS = 36; 

    double userDist, convertDist, distFrom, distTo; 
    string unitOfMeasure; 

    private void convertButton_Click(object sender, RoutedEventArgs e) 
    { 
     unitOfMeasure = null; 
     distFrom = 1; 
     distTo = 1; 
     if (inputTextBox.Text != "") 
     { 
      userDist = double.Parse(inputTextBox.Text); 
      if (listBox1.SelectedIndex >= 0 || listBox2.SelectedIndex >= 0) 
      { 
       switch (listBox1.SelectedIndex) 
       { 
        case 0: 
         distFrom = INCHES; 
         unitOfMeasure = " in"; 
         break; 
        case 1: 
         distFrom = FEET; 
         unitOfMeasure = " ft"; 
         break; 
        case 2: 
         distFrom = YARDS; 
         unitOfMeasure = " yd"; 
         break; 
       } 
       switch (listBox2.SelectedIndex) 
       { 
        case 0: 
         distTo = INCHES; 
         unitOfMeasure = " in"; 
         break; 
        case 1: 
         distTo = FEET; 
         unitOfMeasure = " ft"; 
         break; 
        case 2: 
         distTo = YARDS; 
         unitOfMeasure = " yd"; 
         break; 
       } 
       convertDist = (userDist * distFrom)/distTo; 
       outputTextBlock.Text = convertDist.ToString("n2") + unitOfMeasure; 
      } 
      else 
      { 
       //MessageDialog dialog = new MessageDialog("Please select 'From' and 'To' units."); 
      } 
     } 
     else 
     { 
      //MessageDialog dialog = new MessageDialog("Please input a number to convert."); 
     }   
    } 

    private void clearButton_Click(object sender, RoutedEventArgs e) 
    { 
     inputTextBox.Text = ""; 
     listBox1.SelectedIndex = -1; 
     listBox2.SelectedIndex = -1; 
     outputTextBlock.Text = ""; 
     distFrom = 1; 
     distTo = 1; 
    } 

    private void exitButton_Click(object sender, RoutedEventArgs e) 
    { 
     App.Current.Exit(); 
    }

来源

2015-12-21 Lee Marine

我想你注释掉的代码应该工作，如果您还添加 -

等待dialog.ShowAsync（）;

来源

2015-12-21 20:29:53

像布赖恩说

MessageDialog dialog = new MessageDialog("Please select 'From' and 'To' units."); 
    await dialog.ShowAsync();

应该工作。我还补充说，您需要将convertButton_Click标记为异步方法：

private async void convertButton_Click(object sender, RoutedEventArgs e)

来源

2015-12-21 20:50:13 Seine

太棒了。现在，我忘记了在这个项目中我曾经做过这件事，但当我重新开始时，我得到了一个粗鲁的觉醒：我已经添加了：使用Windows.UI.Popups;到MainPage C＃和App C＃。我应该在哪里具体说明未来？ –

无论你打算使用MessageDialog类，你都必须添加它。 – Seine

如何向通用Windows应用程序添加异常处理消息？

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