新手提问，望大伙指点（关于添加捕捉异常块）
需要添加一个try块，捕捉异常，总是不能顺利添加，请指教哈
我添加红色字体代码，结果却不一样，请各位师兄帮忙看看问题出在哪，多谢！

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;


namespace MathsOperators
{
/// <summary>
/// Interaction logic for Window1.xaml
/// </summary>

public partial class Window1 : Window
{

public Window1()
{
InitializeComponent();
}

private void calculateClick(object sender, RoutedEventArgs e)
try
{
int leftHandSide = int.Parse(lhsOperand.Text);
int rightHandSide = int.Parse(rhsOperand.Text);
int answer = doCalculation(leftHandSide, rightHandSide);
result.Text = answer.ToString();
}
catch (FormatException fEx)
{
result.Text=fEx.Message;
}
private int doCalculation(int leftHandSide, int rightHandSide)
{
int result = 0;

if (addition.IsChecked.HasValue && addition.IsChecked.Value)
result = addValues(leftHandSide, rightHandSide);
else if (subtraction.IsChecked.HasValue && subtraction.IsChecked.Value)
result = subtractValues(leftHandSide, rightHandSide);
else if (multiplication.IsChecked.HasValue && multiplication.IsChecked.Value)
result = multiplyValues(leftHandSide, rightHandSide);
else if (division.IsChecked.HasValue && division.IsChecked.Value)
result = divideValues(leftHandSide, rightHandSide);
else if (remainder.IsChecked.HasValue && remainder.IsChecked.Value)

result = remainderValues(leftHandSide, rightHandSide);

return result;
}

private int addValues(int leftHandSide, int rightHandSide)
{
expression.Text = leftHandSide.ToString() + " + " + rightHandSide.ToString();
return leftHandSide + rightHandSide;
}

private int subtractValues(int leftHandSide, int rightHandSide)
{
expression.Text = leftHandSide.ToString() + " - " + rightHandSide.ToString();
return leftHandSide - rightHandSide;
}

private int multiplyValues(int leftHandSide, int rightHandSide)
{
expression.Text = leftHandSide.ToString() + " * " + rightHandSide.ToString();
return leftHandSide * rightHandSide;
}

private int divideValues(int leftHandSide, int rightHandSide)
{
expression.Text = leftHandSide.ToString() + " / " + rightHandSide.ToString();
return leftHandSide / rightHandSide;
}

private int remainderValues(int leftHandSide, int rightHandSide)
{
expression.Text = leftHandSide.ToString() + " % " + rightHandSide.ToString();
return leftHandSide % rightHandSide;
}

private void quitClick(object sender, RoutedEventArgs e)
{
this.Close();
}
}
}
[解决办法]
你这个代码有语法错误，正确应该是：

private void calculateClick(object sender, RoutedEventArgs e)
{
try
{
int leftHandSide = int.Parse(lhsOperand.Text);

int rightHandSide = int.Parse(rhsOperand.Text);
int answer = doCalculation(leftHandSide, rightHandSide);
result.Text = answer.ToString();
}
catch (FormatException fEx)
{
result.Text=fEx.Message;
}
}
[解决办法]
catch下面掉了一个 } 吧
[解决办法]
try不是跟函数写在一块的，是跟for差不多的。

类似于这样：

void function()
{
   .....
   try
   {
   }
   catch(....)
   {
   }
   finally
   {
   }
    .....
}

[解决办法]

 private void calculateClick(object sender, RoutedEventArgs e)
{
  try
    {
            int leftHandSide = int.Parse(lhsOperand.Text);
            int rightHandSide = int.Parse(rhsOperand.Text);
            int answer = doCalculation(leftHandSide, rightHandSide);
            result.Text = answer.ToString();
    }
      catch (FormatException fEx)
   {
            result.Text=fEx.Message;
   }
}

那段这种格式。
[解决办法]

引用:

C# code?1234567891011121314 private void calculateClick(object sender, RoutedEventArgs e){ try { int leftHandSide = int.Parse(lhsOperand.Text); int rightHandSide……

这个异常捕获不够严谨，下面2句不会抛出FormatException异常。
int answer = doCalculation(leftHandSide, rightHandSide);
result.Text = answer.ToString();
按楼主的意思应该只是想捕获下面2句的异常信息：
int leftHandSide = int.Parse(lhsOperand.Text);
int rightHandSide = int.Parse(rhsOperand.Text);

建议下面的写法：

 private void calculateClick(object sender, RoutedEventArgs e)
{
int leftHandSide，rightHandSide,answer;
  try
    {
            leftHandSide = int.Parse(lhsOperand.Text);
            rightHandSide = int.Parse(rhsOperand.Text);
    }
      catch (FormatException fEx)
   {
            result.Text=fEx.Message; 
 
            return;
   }
            answer = doCalculation(leftHandSide, rightHandSide);
            result.Text = answer.ToString();
}

[解决办法]
function(){
try{
}
catch(Exception ex)
{
}
}
这种模式。