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C# —— 使用WPF搭建小型计算器

• 使用try catch语句捕获（除数为0，参数为空，参数不是数字，数据溢出）这四个异常类。捕获异常后再textblock输出文本框中显示。
• 定义“数学”类，实现加减乘除四个函数。
• 界面用两个输入文本框，加减乘除四个按钮，一个textblock输出文本框。

参数为空报错：

XAML文件：

CS文件：

using System;using System.Collections.Generic;using System.Data.SqlTypes;using System.Linq;using System.Runtime.CompilerServices;using System.Text;using System.Threading.Tasks;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 WpfApp3{       public partial class MainWindow : Window    {           public MainWindow()        {               InitializeComponent();        }        private void Button_Click(object sender, RoutedEventArgs e)        {               double x, y;            MyMath M = new MyMath();            textbox3.Clear();            if (textbox1.Text == "" || textbox2.Text == "")            {                   try                {                       x = double.Parse(textbox1.Text);                    y = double.Parse(textbox2.Text);                }                catch (Exception)                {                       textbox3.Text += "错误：参数为空";                }            }            else            {                   try                {                       x = double.Parse(textbox1.Text);                    y = double.Parse(textbox2.Text);                    if (jiafa.IsChecked == true)                    {                           textbox3.Text = M.GetHe(x, y).ToString();                    }                    else if (jianfa.IsChecked == true)                    {                           textbox3.Text = M.GetCha(x, y).ToString();                    }                    else if (chengfa.IsChecked == true)                    {                           textbox3.Text = M.GetJi(x, y).ToString();                    }                    else if (chufa.IsChecked == true)                    {                           try                        {                               textbox3.Text = M.GetShang(x, y).ToString();                        }                        catch (DivideByZeroException err)                        {                               textbox3.Text += err;                        }                    }                }                catch (FormatException err)                {                       textbox3.Text += err;                }                catch (OverflowException err)                {                       textbox3.Text += err;                }            }        }        private void jiafa_Click(object sender, RoutedEventArgs e)        {               if (jiafa.IsChecked == true)            {                   label1.Content = "+";                groupbox.Header = "加法";            }            textbox1.Text = "";            textbox2.Text = "";            textbox3.Text = "";        }        private void jianfa_Click(object sender, RoutedEventArgs e)        {               if (jianfa.IsChecked == true)            {                   label1.Content = "-";                groupbox.Header = "减法";            }            textbox1.Text = "";            textbox2.Text = "";            textbox3.Text = "";        }        private void chengfa_Click(object sender, RoutedEventArgs e)        {               if (chengfa.IsChecked == true)            {                   label1.Content = "*";                groupbox.Header = "乘法";            }            textbox1.Text = "";            textbox2.Text = "";            textbox3.Text = "";        }        private void chufa_Click(object sender, RoutedEventArgs e)        {               if (chufa.IsChecked == true)            {                   label1.Content = "/";                groupbox.Header = "除法";            }            textbox1.Text = "";            textbox2.Text = "";            textbox3.Text = "";        }            }    class MyMath    {           public double GetHe(double numA, double numB)        {               return numA + numB;        }        public double GetCha(double numA, double numB)        {               return numA - numB;        }        public double GetShang(double numA, double numB)        {               if (numB == 0) throw new DivideByZeroException();            return numA / numB;        }        public double GetJi(double numA, double numB)        {               return numA * numB;        }    }}

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