WPF计算

设计思路：

用WPF窗体设计，在第一个数和第二个数的文本框中输入数值，单击录题按钮，数值保存在n1,n2文档中,把要做的题都保存完后，单击开始按钮，开始做题，每做完一道题，按Enter键，进入下一题，同时提示回答是否正确。如果在时间内做完题就单击结束按钮，弹出对话框“答题结束” 总计，正确的个数及正确率显示出来。

MainWindow.xaml设计为:

代码为：

 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;
 using System.IO;

 namespace xiaoshitou
 {
     /// <summary>
     /// MainWindow.xaml 的交互逻辑
     /// </summary>
     public partial class MainWindow : Window
     {
         public MainWindow()
         {
             InitializeComponent();
         }
         public static int Count = ;//总计的个数
         public static int right = ;//正确的个数
         int n = ;
         private void button1_Click(object sender, RoutedEventArgs e)
         {
             label4.Content = "+";

         }

         private void button2_Click(object sender, RoutedEventArgs e)
         {
             label4.Content = "-";

         }

         private void button3_Click(object sender, RoutedEventArgs e)
         {
             label4.Content = "-";
             ;
         }

         private void button4_Click(object sender, RoutedEventArgs e)
         {
             label4.Content = "-";

         }

         private void button5_Click(object sender, RoutedEventArgs e)
         {

             StreamWriter n1 = File.AppendText("n1.txt");//第一个数存入第一文档
             n1.WriteLine(textBox1.Text);
             n1.Close();
             StreamWriter n2 = File.AppendText("n2.txt");//第二个数存入第二个文档
             n2.WriteLine(label4.Content);
             n2.Close();
             StreamWriter n3 = File.AppendText("n3.txt");//结果存入第三个文档
             n3.WriteLine(textBox2.Text);
             n3.Close();
             textBox1.Clear();
             textBox2.Clear();
             textBox3.Clear();
             MessageBox.Show("录题成功");
         }

         private void button6_Click(object sender, RoutedEventArgs e)
         {

             string[] n1 = new string[];
             n1 = File.ReadAllLines("n1.txt");//数值一的文档
             textBox1.Text = n1[n];
             string[] n2 = new string[];
             n2 = File.ReadAllLines("n2.txt");
             label4.Content = n2[n];
             string[] n3 = new string[];
             n3 = File.ReadAllLines("n3.txt");
             textBox2.Text = n3[n];
             n++;
         }

         private void button7_Click(object sender, RoutedEventArgs e)
         {            textBox3.IsEnabled = false;
             MessageBox.Show("运算结束！");
             textBox4.Text = Count.ToString();//题目总数
             textBox5.Text =right.ToString();//正确的个数
             textBox6.Text = ((right / (double)(Count)) * ).ToString() + "%";//正确率
         }

         private void textBox3_KeyDown(object sender, KeyEventArgs e)
         {
             int a = int.Parse(textBox1.Text);
             int b = int.Parse(textBox2.Text);
             Char c = Convert.ToChar(label4.Content);
             Class1 con = new Class1();
             con.js(a, b, c);
             if (e.Key == Key.Enter)
             {
                 if (con.y1 == int.Parse(textBox3.Text))
                 {
                     MessageBox.Show("回答正确！下一题请按开始按钮！");
                     right++;
                     Count++;
                 }

                 else
                 {

                     MessageBox.Show("回答错误！下一题请按开始按钮！");
                     Count++;

                 }
                 //清空
                 textBox3.Clear();
                 textBox1.Clear();
                 textBox2.Clear();

             }
         }
     }
 }

Class.cs代码

 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

 namespace xiaoshitou
 {
     class Class1
     {
         public int result;
         public int y1
         {
             get
             {
                 return result;
             }
         }

         public int js(int n1, int n2, char mark)
         {
             if (mark == '+')
             {
                 return result = n1 + n2;
             }
             else if (mark == '-')
             {
                 return result = n1 - n2;
             }
             else if (mark == '*')
             {
                 return result = n1 * n2;
             }
             else if (mark == '/')
             {
                 return result = n1 / n2;
             }
             return result;
         }
     }
 }

运行过程的各部分显示为以下图片：