运行界面：

数据库保存的题：

数据库封装代码：

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.Data.SqlClient;

using System.Data;

namespace WpfApplication1

{

class shujuku

{

public string str = @"Data Source=.;Initial Catalog=四则运算;Integrated Security=True;Pooling=False";

public SqlConnection sqlcon = new SqlConnection();

public SqlDataAdapter sda = new SqlDataAdapter();

public DataSet ds = new DataSet();

public DataTable dt = new DataTable();

public string x1;

public string x2;

public string x3;

public string x4;

public string x5;

public string x6;

public string x7;

public string x8;

public void dbcon()

{

try

{

sqlcon = new SqlConnection(str);

}

catch (Exception ex)

{

MessageBox.Show("数据链接不成功"+ex.Message);

}

}

public void ChuTi()

{

dbcon();

sqlcon.Open();

string sqltr = "insert into Table2(第一个数,符号,第二个数) values('" + x1 + "','" + x2 + "','" + x3 + "')";

SqlCommand comm = new SqlCommand(sqltr, sqlcon);

try

{

comm.ExecuteNonQuery();

MessageBox.Show("出题成功！");

}

catch (Exception ex)

{

MessageBox.Show("出题失败" + ex.ToString());

}

sqlcon.Close();

}

public void ShanChu()

{

dbcon();

sqlcon.Open();

string sqltr = "delete from Table2";

SqlCommand comm = new SqlCommand(sqltr, sqlcon);

try

{

comm.ExecuteNonQuery();

MessageBox.Show("删除成功");

}

catch (Exception ex)

{

MessageBox.Show("删除失败" + ex.ToString());

}

SqlDataReader reder = comm.ExecuteReader();

sqlcon.Close();

}

public void JiSuan()

{

int i = int.Parse(x4);

dbcon();

sqlcon.Open();

string sqltr = "select * from Table2 ";

SqlCommand comm = new SqlCommand(sqltr, sqlcon);

SqlDataAdapter da = new SqlDataAdapter(comm);

DataSet ds = new DataSet();

da.Fill(ds);

DataTable dt = ds.Tables[0];

x5 = dt.Rows[i][0].ToString();

x6 = dt.Rows[i][1].ToString();

x7 = dt.Rows[i][2].ToString();

sqlcon.Close();

}

public void DaoRu()

{

dbcon();

sqlcon.Open();

string sqltr = "select * from Table2 ";

SqlCommand comm = new SqlCommand(sqltr, sqlcon);

SqlDataAdapter da = new SqlDataAdapter(comm);

DataSet ds = new DataSet();

da.Fill(ds);

DataTable dt = ds.Tables[0];

for (int i = 0; i < dt.Rows.Count; i++)

{

dt.Rows[i][0].ToString();

dt.Rows[i][1].ToString();

dt.Rows[i][2].ToString();

x8 += dt.Rows[i][0].ToString().Trim() + dt.Rows[i][1].ToString().Trim() + dt.Rows[i][2].ToString().Trim() + "\n";

}

sqlcon.Close();

}

}

}

wpf代码：

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.Data.SqlClient;

using System.Data;

namespace WpfApplication1

{

///

/// MainWindow.xaml 的交互逻辑

///

public partial class MainWindow : Window

{

public MainWindow()

{

InitializeComponent();

}

public static int Count = 0;

public static int zhengque = 0;

public static int lefttime;

public static int sum;

shujuku sj = new shujuku();

private void button1_Click(object sender, RoutedEventArgs e)

{

sj.x1 = left.Text;

sj.x2 = fuhao.Text;

sj.x3 = right.Text;

sj.ChuTi();

string f = fuhao.Text;

switch (f)

{

case "+":

sum = int.Parse(left.Text) + int.Parse(right.Text);

daan1.Text += sum + "\r\n";

break;

case "-":

sum = int.Parse(left.Text) - int.Parse(right.Text);

daan1.Text += sum + "\r\n";

break;

case "*":

sum = int.Parse(left.Text) * int.Parse(right.Text);

daan1.Text += sum + "\r\n";

break;

case "/":

sum = int.Parse(left.Text) / int.Parse(right.Text);

daan1.Text += sum + "\r\n";

break;

default:

break;

}

left.Clear();

fuhao.Clear();

right.Clear();

}

private void button2_Click(object sender, RoutedEventArgs e)

{

sj.ShanChu();

}

private void button4_Click(object sender, RoutedEventArgs e)

{

sj.x4=textBox5.Text;

textBox1.Text= sj.x5;

textBox2.Text= sj.x6;

textBox3.Text=sj.x7 ;

sj.JiSuan();

}

private void button5_Click(object sender, RoutedEventArgs e)

{

if (daan1.Text == "显示答案")

{

daan1.Visibility = Visibility.Visible;

daan1.Text = "隐藏答案";

}

else if (daan1.Text == "隐藏答案")

{

daan1.Visibility = Visibility.Hidden;

daan1.Text = "显示答案";

}

}

private void button3_Click(object sender, RoutedEventArgs e)

{

textBox6.Text = sj.x8;

sj.DaoRu();

}

private void textBox4_KeyDown(object sender, KeyEventArgs e)

{

tiaoyong ty = new tiaoyong();

string fuha = textBox2.Text;

ty.c = int.Parse(textBox1.Text);

ty.n = int.Parse(textBox3.Text);

ty.yunsuan(fuha);

if (e.Key == Key.Enter)

{

if (textBox4.Text == ty.result.ToString())

{

MessageBox.Show("回答正确");

zhengque++;

}

else

{

MessageBox.Show("回答错误");

}

textBox4.Clear();

}

}

private void Window_Loaded(object sender, RoutedEventArgs e)

{

shujuku sj = new shujuku();

}

}

}

策略封装代码：

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

namespace WpfApplication1

{

public interface ITaxStragety

{

int Calcul(int a,int b);

}

class Class2 : ITaxStragety

{

public int Calcul(int a, int b)

{

return a + b;

}

}

class sub : ITaxStragety

{

public int Calcul(int a, int b)

{

return a - b;

}

}

class sheng : ITaxStragety

{

public int Calcul(int a, int b)

{

return a *b;

}

}

class chu : ITaxStragety

{

public int Calcul(int a, int b )

{

return a / b;

}

}

class tiaoyong

{

public int result = 0;

public int c=0;

public int n=0;

public void yunsuan(string m)

{

if (m == "+")

{

Class2 jia = new Class2();

result = jia.Calcul(c, n);

}

if (m == "-")

{

sub su = new sub();

result = su.Calcul(c, n);

}

if (m == "*")

{

sheng sh = new sheng();

result = sh.Calcul(c, n);

}

if (m == "/")

{

chu ch = new chu();

result = ch.Calcul(c, n);

}

}

}

}