WPF+数据库+三层

1.计算类

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

namespace Zwt
{
    class Class1
    {
    }
    interface Iation//定义计算接口
    {
        double Calation(double a, double b);
    }
    class Add : Iation//加法
    {
        public double Calation(double a, double b)
        {
            return a + b;
        }
    }
    class Sub : Iation//减法
    {
        public double Calation(double a, double b)
        {
            return a - b;
        }
    }
    class Mul : Iation//乘法
    {
        public double Calation(double a, double b)
        {
            return a * b;
        }
    }
    class Div : Iation//除法
    {
        public double Calation(double a, double b)
        {
            if (b == )
            {
                throw new Exception("除数不能为零！");
            }
            else
            {
                return a / b;
            }
        }
    }
    class Factionsss//实现策略模式！
    {
        private Iation clation;
        public Factionsss(string operation)
        {
            switch (operation)
            {
                case "+":
                    clation = new Add();
                    break;
                case "-":
                    clation = new Sub();
                    break;
                case "*":
                    clation = new Mul();
                    break;
                case "/":
                    clation = new Div();
                    break;
            }

        }
        public double cal(double a, double b)
        {
            return clation.Calation(a, b);
        }

    }
}

2,实体类

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

namespace Zwt
{
    class TIModel
    {
        string number1;
        string number2;
        string operation;
        public string Number1
        {
            get
            {
                return number1;
            }
            set
            {
                number1 = value;
            }
        }
        public string Number2
        {
            get
            {
                return number2;
            }
            set
            {
                number2 = value;
            }
        }
        public string Operation
        {
            get
            {
                return operation;
            }
            set
            {
                operation = value;
            }
        }

    }
}

3.DBhelper类

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

namespace Zwt
{
    class DBhelper
    {
        string constr = "Data Source=.;Initial Catalog=TIKU;Integrated Security=True";
        SqlConnection conn = new SqlConnection();
        SqlCommand cmd = new SqlCommand();
        public void dbcon()
        {
            try
            {
                conn = new SqlConnection(constr);
            }
            finally
            {

            }

        }
        public void OPen()
        {
            conn.Open();
        }
        public void Close()
        {
            conn.Close();
        }
        public int execSql(string safeSql, params SqlParameter[] values)//增删
        {
            int result;
            conn = new SqlConnection(constr);
            cmd = new SqlCommand(safeSql, conn);
            OPen();
            if (values != null)
            {
                cmd.Parameters.AddRange(values);
            }
            try
            {
                result = cmd.ExecuteNonQuery();
            }
            finally
            {
                Close();

            }
            return result;

        }
        public DataSet execDataset(string safeSql, params SqlParameter[] values)//读
        {
            conn = new SqlConnection(constr);
            cmd = new SqlCommand(safeSql, conn);
            if (values != null)
            {
                cmd.Parameters.AddRange(values);
            }
            DataSet ds = new DataSet();
            SqlDataAdapter da = new SqlDataAdapter(cmd);
            da.Fill(ds);
            return ds;
        }

    }
}

4，数据访问层

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data;
using System.Data.SqlClient;
namespace Zwt
{
    class TIDAL
    {
        public int InsterTI(TIModel Ti)
        {
            string sql = "insert into TI(number1,operation,number2) values (@number1,@operation,@number2)";
            SqlParameter[] para = new SqlParameter[]
            {
                new SqlParameter("@number1",Ti.Number1),
                new SqlParameter("@operation",Ti.Operation),
                new SqlParameter("@number2",Ti.Number2),
            };
            DBhelper helper = new DBhelper();
            return helper.execSql(sql, para);
        }
        public DataSet Read()
        {
            string sql = "select number1,operation,number2 from TI";
            DBhelper helper = new DBhelper();
            return helper.execDataset(sql);

        }
        public int DeleteTI()
        {
            string sql = "delete from TI ";
            SqlParameter[] para = new SqlParameter[] { };
            DBhelper helper = new DBhelper();
            return helper.execSql(sql, para);

        }
    }
}

5，业务逻辑层

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

namespace Zwt
{
    class TIBLL
    {
        TIDAL TI1 = new TIDAL();
        public int InsertTi(TIModel Ti1)
        {
            return TI1.InsterTI(Ti1);
        }
        public int Delect()
        {
            return TI1.DeleteTI();
        }
        public DataSet Read()
        {
            return TI1.Read();
        }
    }
}

UI层

Mainwidowd的代码

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;

namespace Zwt
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }
        TIBLL tib = new TIBLL();

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            TIModel Tim = new TIModel();
            Tim.Number1 =textBox1.Text;
            Tim.Number2 = textBox2.Text;
            Tim.Operation = comboBox1.Text;
            int a = tib.InsertTi(Tim);
            if (a > )
            {
                MessageBox.Show("保存成功！");
            }
            else
            {
                MessageBox.Show("保存失败！");
            }
            textBox1.Clear();
            textBox2.Clear();
        }

        private void button2_Click(object sender, RoutedEventArgs e)
        {
            int b = tib.Delect();
            if (b > )
            {
                MessageBox.Show("删除成功！");
            }
            else
            {
                MessageBox.Show("删除失败！");
            }
        }

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            Window1 win = new Window1();
            win.ShowDialog();
        }

        private void Window_Loaded(object sender, RoutedEventArgs e)
        {

        }
    }
}

window1的代码

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.Shapes;
using System.Data.SqlClient;
using System.Data;

namespace Zwt
{
    /// <summary>
    /// Window1.xaml 的交互逻辑
    /// </summary>
    public partial class Window1 : Window
    {
        public Window1()
        {
            InitializeComponent();
        }
        TIBLL TIll = new TIBLL();
        int i = ;
        private void Window_Loaded(object sender, RoutedEventArgs e)
        {

            DataSet ds= TIll.Read();
            DataTable dt = ds.Tables[];
            textBox1.Text = dt.Rows[][].ToString().Trim();
            textBox2.Text = dt.Rows[][].ToString().Trim();
            label1.Content = dt.Rows[][].ToString().Trim();

        }

        private void textBox3_KeyDown(object sender, KeyEventArgs e)
        {
            double a=Convert.ToDouble(textBox1.Text);
            double b=Convert.ToDouble(textBox2.Text);
            Factionsss fas = new Factionsss(label1.Content.ToString());
            double aswer = fas.cal(a, b);
            if (aswer.ToString() == textBox3.Text)
            {
                MessageBox.Show("回答正确！");
            }
            else
            {
                MessageBox.Show("回答错误！");
            }
            textBox3.Clear();
            read();

        }
        private void read()
        {
            DataSet ds = TIll.Read();
            DataTable dt = ds.Tables[];
            textBox1.Text = dt.Rows[i][].ToString().Trim();
            textBox2.Text = dt.Rows[i][].ToString().Trim();
            label1.Content = dt.Rows[i][].ToString().Trim();

        }
    }
}