c# 备份还原 例子

//记得加 folderBrowserDialog1   openFileDialog1      控件
using System.Data.SqlClient;   //连接数据库   公共变量
namespace WindowsApplication1.GoodMenhod
{
    class getSqlConnection
    { 
        string sql = "Data Source=win7-pc;database=Kc;uid=sa;pwd=sa";
        SqlConnection conn; 
      
        public SqlConnection GetCon()
        {
           conn = new SqlConnection(sql);
           conn.Open();
           return conn;
        }
     
    }
}


using System.Data.SqlClient;
using WindowsApplication1.GoodMenhod;  //引用命名空间
namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e)  //打开 备份路径
        {
            if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
            {
                txtPath.Text = folderBrowserDialog1.SelectedPath.ToString();
            }
        }
        private void button2_Click(object sender, EventArgs e)  //备份名称  保存 
        {
            try
            {
                if (txtPath.Text != "" )
                {
                    getSqlConnection geCon = new getSqlConnection();
                    SqlConnection con = geCon.GetCon();
                    string strBacl = "backup database Kc to disk='" + txtPath.Text.Trim() + "\\" + txtName.Text.Trim() + ".bak'";
                    SqlCommand Cmd = new SqlCommand(strBacl, con);
                    if (Cmd.ExecuteNonQuery() != 0)
                    {
                        MessageBox.Show("数据备份成功！", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        this.Close();
                    }
                    else
                    {
                        MessageBox.Show("数据备份失败！", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                }
                else
                {
                    MessageBox.Show("请填写备份的正确位置及文件名！", "提示框", MessageBoxButtons.OK, MessageBoxIcon.Information);
                }// end 
            }
            catch (Exception ee)
            {
                MessageBox.Show(ee.Message.ToString());
            }

        }
    }
}


   private void button3_Click(object sender, EventArgs e)  //打开 将要还原的文件
        {
            openFileDialog1.FilterIndex = 0;
            openFileDialog1.FileName = "";
            openFileDialog1.Filter = "txt files (*.bak)|*.bak|All files (*.*)|*.*";

            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                textPaht.Text = openFileDialog1.FileName.ToString();
            }
        }
 
private void button4_Click(object sender, EventArgs e)   //还原
        {
             if (textPaht.Text != "")
            {
                getSqlConnection geCon = new getSqlConnection();
                SqlConnection con = geCon.GetCon();
                if (con.State == ConnectionState.Open)
                {
                    con.Close();
                }
                //连接的数据库是master,所以要初始化新的连接字符串
                string DateStr = "Data Source=win7-pc;Database=master;User id=sa;PWD=sa";
                SqlConnection conn = new SqlConnection(DateStr);
                conn.Open();
                //-------------------杀掉所有连接 db_CSManage 数据库的进程--------------
               // string sql = " SELECT spid FROM master..sysprocesses WHERE dbid=db_id('" + strDBName + "')";
                string strSQL = "select spid from master..sysprocesses where dbid=db_id( 'Kc') ";//读取连接当前数据库的进程
                SqlDataAdapter Da = new SqlDataAdapter(strSQL, conn);
                DataTable spidTable = new DataTable();
                Da.Fill(spidTable);
                SqlCommand Cmd = new SqlCommand();
                Cmd.CommandType = CommandType.Text;
                Cmd.Connection = conn;
                for (int iRow = 0; iRow <= spidTable.Rows.Count - 1; iRow++)
                {
                    Cmd.CommandText = "kill " + spidTable.Rows[iRow][0].ToString();   //强行关闭用户进程 
                    Cmd.ExecuteNonQuery();
                }
                conn.Close();
                conn.Dispose();
                //--------------------------------------------------------------------
                SqlConnection sqlcon = new SqlConnection(DateStr);
                sqlcon.Open();
                SqlCommand sqlCmd = new SqlCommand("backup database Kc to disk='" + textPaht.Text.Trim() + "' restore database Kc from disk='" + textPaht.Text.Trim() + "'", sqlcon);
                sqlCmd.ExecuteNonQuery();
                sqlCmd.Dispose();
                sqlcon.Close();
                sqlcon.Dispose();
                MessageBox.Show("数据还原成功！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                MessageBox.Show("为了必免数据丢失，在数据库还原后将关闭整个系统。");
                Application.Exit();
            }
            else
            {
                MessageBox.Show("请选择备份文件！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }