ado.net封装类

1、MainWindow.xaml 面板

<Window x:Class="Test.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:Test"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525" WindowState="Maximized">
    <Grid >
        <DockPanel>
            <Menu DockPanel.Dock="Top">
                <MenuItem Header="文件">
                    <MenuItem Header="打开"></MenuItem>
                </MenuItem>
                <MenuItem Header="编辑">
                    <MenuItem Header="复制"></MenuItem>
                </MenuItem>
                <MenuItem x:Name="About" Header="关于我们" Click="About_Click"></MenuItem>
                <MenuItem x:Name="Update" Header="更新" Click="Update_Click"></MenuItem>
                <MenuItem x:Name="Chaxun" Header="查询1" Click="Chaxun_Click"></MenuItem>
                <MenuItem x:Name="Chaxun2" Header="查询2" Click="Chaxun2_Click"></MenuItem>
            </Menu>
            <TextBox DockPanel.Dock="Left"></TextBox>
            <TextBox DockPanel.Dock="Right"></TextBox>
            <TextBox DockPanel.Dock="Bottom"></TextBox>
            <Button Content="左" DockPanel.Dock="Left"></Button>
            <Button Content="右" DockPanel.Dock="Right"></Button>
        </DockPanel>
    </Grid>

</Window>

2、MainWindow.xaml.cs 事件

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

namespace Test
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void About_Click(object sender, RoutedEventArgs e)
        {
            //AboutWindow abw = new AboutWindow();
            //abw.ShowDialog();
            SqlHelper sh = new SqlHelper();
            SqlParameter[] pars = new SqlParameter[] {
                new SqlParameter("@name", "赵六"),
                new SqlParameter("@id", "1")
            };

            string sql = "UPDATE user1 SET [email protected] WHERE [email protected]";
            int count = sh.ExcuteSQLReturnInt(sql, pars);
            MessageBox.Show("更新了 "+count+" 条数据");
        }

        private void Update_Click(object sender, RoutedEventArgs e)
        {
            //连接字符串（可以在左边服务器资源管理器里自动生成）：
            //Data source=服务器名（IP地址）\实例名;
            //Initial Catalog=数据库名;
            //Integrated Security=True    集成身份验证
            //User ID=xxx;Password=xxx    用户名密码登陆
            string constr = @"Data source=LENOVO-PC;Initial Catalog=test;Integrated Security=False;User ID=sa;Password=root";

            using (SqlConnection con = new SqlConnection(constr))
            {

               string sql = "UPDATE user1 SET name=‘wwwww‘ WHERE id=1 ";

                using (SqlCommand cmd = new SqlCommand(sql, con))
                {
                    if (con.State == System.Data.ConnectionState.Closed)
                    {
                        con.Open();
                    }
                    int r = cmd.ExecuteNonQuery();
                    con.Close();
                    MessageBox.Show("已成功修改"+r+"条语句");
                }
            }
        }

        private void Chaxun_Click(object sender, RoutedEventArgs e)
        {
            SqlHelper sh = new SqlHelper();
            SqlParameter[] pars = new SqlParameter[] {
                new SqlParameter("@pwd", "bbbbbb")
            };

            string sql = "SELECT * FROM user1 WHERE [email protected]";
            ArrayList DataList = sh.DataList(sql, pars);
            foreach(ArrayList list in DataList)
            {
                foreach (Object obj in list)
                {
                    MessageBox.Show(obj.ToString());
                }
            }
        }

        private void Chaxun2_Click(object sender,RoutedEventArgs e)
        {
            SqlHelper sh = new SqlHelper();
            SqlParameter[] pars = new SqlParameter[]
            {
                new SqlParameter("@pwd","bbbbbb")
            };
            string sql = "SELECT * FROM user1 WHERE [email protected]";
            ArrayList list = sh.DataSet(sql,pars);
            foreach(DataRow rows in list)
            {
                MessageBox.Show(rows["name"].ToString());
            }
        }
    }
}

3、SqlHelper.cs  ado.net封装类

using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Collections;
using System.Data;

namespace Test
{
    //操作数据库方法
    class SqlHelper
    {
        public string MyConnString
        {
            get
            {
                return @"Data source=LENOVO-PC;Initial Catalog=test;Integrated Security=False;User ID=sa;Password=root";
            }
        }

        //执行insert,update,delete命令
        //返回受影响的行数
        public int ExcuteSQLReturnInt(string sql,SqlParameter[] pars)
        {
            SqlConnection conn = new SqlConnection(MyConnString);
            try
            {
                SqlCommand cmd = new SqlCommand(sql, conn);
                if (conn.State == System.Data.ConnectionState.Closed || conn.State == System.Data.ConnectionState.Broken)
                {
                    conn.Open();
                }
                if(pars!=null && pars.Length > 0)
                {
                    foreach (SqlParameter p in pars)
                    {
                        cmd.Parameters.Add(p);
                    }
                }

                int count = cmd.ExecuteNonQuery();
                return count;
            }
            catch (Exception ex)
            {
                return 0;
            }
            finally
            {
                conn.Close();
            }
        }

        //查询select
        public ArrayList DataList(string sql,SqlParameter[] pars)
        {
            SqlConnection conn = new SqlConnection(MyConnString);
            SqlCommand cmd = new SqlCommand(sql,conn);

            if (conn.State == System.Data.ConnectionState.Closed || conn.State == System.Data.ConnectionState.Broken)
            {
                conn.Open();
            }

            if (pars != null && pars.Length > 0)
            {
                foreach (SqlParameter p in pars)
                {
                    cmd.Parameters.Add(p);
                }
            }

            SqlDataReader reader = cmd.ExecuteReader();
            ArrayList list = new ArrayList();
            while (reader.Read())
            {
                ArrayList list1 = new ArrayList();
                for (int i = 0; i< reader.FieldCount; i++)
                {
                    list1.Add(reader[i]);
                }
                list.Add(list1);
            }
            conn.Close();
            return list;
        }

        //查询select
        public ArrayList DataSet(string sql,SqlParameter[] pars)
        {
            SqlConnection conn = new SqlConnection(MyConnString);
            SqlCommand cmd = new SqlCommand(sql,conn);
            if (conn.State == System.Data.ConnectionState.Closed || conn.State == System.Data.ConnectionState.Broken)
            {
                conn.Open();
            }

            if (pars != null && pars.Length > 0)
            {
                foreach (SqlParameter p in pars)
                {
                    cmd.Parameters.Add(p);
                }
            }

            SqlDataAdapter adapter = new SqlDataAdapter(cmd);
            DataSet dataset = new DataSet();
            adapter.Fill(dataset);

            DataTable table = dataset.Tables[0];
            DataRowCollection rows = table.Rows;
            ArrayList list = new ArrayList();
            for(int i = 0; i < rows.Count; i++)
            {
                DataRow row = rows[i];
                list.Add(row);
            }
            return list;
        }

    }
}