通过winfrom界面 修改Mysql的用户(root)的密码

处理思路：
1、利用MySql.Data.MySqlClient 验证当前的数据库连接信息是否正确；
2、调用命令行 执行C:\\mysql\\bin\\mysql 的 SET PASSWORD 进行用户密码修改；
3、利用新的用户密码 重新验证对数据库的连接是否正确；
4、成功或失败的提示；

示例代码：

代码

using  System;
using  System.Collections.Generic;
using  System.ComponentModel;
using  System.Data;
using  System.Drawing;
using  System.Text;
using  System.Windows.Forms;
using  MySql.Data.MySqlClient;

namespace  WinPassCheck
{
     public   partial   class  PassCheck : Form
    {
         public  PassCheck()
        {
            InitializeComponent();
        }  

         #region  执行命令

         public   string  ExecuteCmd( string  setupPath,  string  ArgumentList)
        {
            System.Diagnostics.Process p  =   new  System.Diagnostics.Process();
            p.StartInfo.FileName  =  setupPath;
            p.StartInfo.UseShellExecute  =   false ;
            p.StartInfo.RedirectStandardInput  =   true ;
            p.StartInfo.RedirectStandardOutput  =   true ;
            p.StartInfo.RedirectStandardError  =   true ;
            p.StartInfo.CreateNoWindow  =   true ;
            p.StartInfo.Arguments  =  ArgumentList;

            p.Start();
             string  strRst  =  p.StandardOutput.ReadToEnd();
            p.WaitForExit();
            
             return  strRst;
        }
         #endregion

         private   void  button1_Click( object  sender, EventArgs e)
        {

             try
            {
                 string  strResult  =   "" ;
                 string  newPath  =   new  System.IO.FileInfo(System.Reflection.Assembly.GetExecutingAssembly().Location).Directory.FullName;
                 if  ( this .txtNewPassword.Text  !=   this .txtNewPasswordConfirm.Text)
                {
                    MessageBox.Show( " 两次输入密码不一致 " );
                     return ;
                }

                 if  (fnIsConnDBOK( this .txtOldPassword.Text.Trim()))
                {
                    strResult  =  ExecuteCmd(  " C:\\mysql\\bin\\mysql " ,  "  -u root -p "   +   this .txtOldPassword.Text.Trim()  +   "  -e \ " SET PASSWORD FOR root@ ' % '   =  OLD_PASSWORD( ' " + this.txtNewPassword.Text.Trim() + " ' )\ "" );

                     if  (fnIsConnDBOK( this .txtNewPassword.Text.Trim()))
                    {
                        MessageBox.Show( " 修改成功 " );
                         return ;
                    }
                     else
                    {
                        MessageBox.Show( " 修改失败 " );
                         return ;
                    }
                }
                 else
                {
                    MessageBox.Show( " 原密码错误，请核对数据库信息及原密码信息 " );
                     return ;
                }
                
            }
             catch
            {
                MessageBox.Show( " 设置密码失败，请确认 " );
            } 
        }

         private   bool  fnIsConnDBOK( string  strPassword)
        {
             try
            {
                 // 测试连接
                 string  connectionstring  =   " Host= "   +   this .txtIP.Text.Trim();
                connectionstring  +=   " ;User ID= "   +   this .txtUserName.Text.Trim();
                connectionstring  +=   " ;Password= "   +  strPassword;
                connectionstring  +=   " ;Port= "   +   this .txtPort.Text.Trim();
                connectionstring  +=   " ;Database= "   +   this .txtDBName.Text.Trim();
                connectionstring  +=   " ;pooling=false   " ;
                 using  (MySqlConnection conn  =   new  MySqlConnection(connectionstring))
                {
                    
                    conn.Open();
                    conn.Close();
                    conn.Dispose();
                }
                 return   true ;
            }
             catch
            {
                 return   false ;
            }
        }
    }
}