Question

我有一个带有各种小程序的wpf应用程序，其中一个计算平行四边形的面积。我正在添加一些错误处理，以便如果用户在高度或宽度框中输入大于double.MaxValue的值，则会显示错误消息。如何确定哪个文本框输入触发了异常，以便将其与错误消息一起返回？如果重要，则“高度”和“宽度”框位于“用户控件”中。

private void AreaOfParallelogramCalcBtn_Click(object sender, RoutedEventArgs e)
{
    if (Convert.ToDouble(AreaOfParallelogramHeightTxtBox.Text) > double.MaxValue == false || (Convert.ToDouble(AreaOfParallelogramWidthTxtBox.Text) > double.MaxValue == false))
    {
        MessageBox.Show("Seriously?  That is a pretty big number.  Please try again.");
    }
    else
    {
        AreaOfParallelogramResultTxtBox.Text =
        CalculateAreaOfParallelogram.Calculate(Convert.ToDouble(AreaOfParallelogramHeightTxtBox.Text),
        Convert.ToDouble(AreaOfParallelogramWidthTxtBox.Text)).ToString();
    }
}

Answer 1

所以这可能不是最好的方法，但这就是我最终做的并取得了预期的效果。

    private void AreaOfParallelogramCalcBtn_Click(object sender, RoutedEventArgs e)
    {
        if (Convert.ToDouble(AreaOfParallelogramHeightTxtBox.Text) > 25000000)
        {
            MessageBox.Show($"Height input out of range.  Height must be less than 25,000,000\n{Convert.ToDouble(AreaOfParallelogramHeightTxtBox.Text):n0} is a pretty big number.  Please try again.", "*WARNING*", MessageBoxButton.OK, MessageBoxImage.Warning);
        }
        else if (Convert.ToDouble(AreaOfParallelogramWidthTxtBox.Text) > 25000000)
        {
            MessageBox.Show($"Width input out of range.  Width must be less than 25,000,000\n{Convert.ToDouble(AreaOfParallelogramWidthTxtBox.Text):n0} is a pretty big number.  Please try again.", "*WARNING*", MessageBoxButton.OK, MessageBoxImage.Warning);
        }
        else
        {
            AreaOfParallelogramResultTxtBox.Text =
            CalculateAreaOfParallelogram.Calculate(Convert.ToDouble(AreaOfParallelogramHeightTxtBox.Text),
            Convert.ToDouble(AreaOfParallelogramWidthTxtBox.Text)).ToString(CultureInfo.InvariantCulture);
        }
    }

Answer 2

使用例外来源

   try
    {
    ....
    }
    Catch(Exception ex)
    {
     MessageBox.Show(ex.Source)
    }

确定什么引发了异常？

2 个答案: