changeuserpasswordform.cs

vs2005+sql server2005编写的小区物业管理系统

//文件名：ChangeUserPasswordForm.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

using System.Security.Cryptography;
using System.IO;
using System.Security.Principal;
using System.Data.SqlClient;
namespace MyCommunity
{
    public partial class ChangeUserPasswordForm : Form
    {
        public ChangeUserPasswordForm()
        {
            InitializeComponent();
        }
        private void 返回系统Button_Click(object sender, EventArgs e)
        {
            this.Close();
        }
        private void 修改密码Button_Click(object sender, EventArgs e)
        {
            if (!(this.新密码TextBox.Text == this.再输一次新密码TextBox.Text) || (this.新密码TextBox.Text.Length == 0))
            {
                MessageBox.Show("两次密码的输入不一致！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                return;
            }
            string MyHashName = "SHA1";
            //创建一个哈希算法
            HashAlgorithm MyHashAlgorithm = HashAlgorithm.Create(MyHashName);
            string MyNewPassword = this.新密码TextBox.Text;            
            //转换密码字符串为一个字节数组
            byte[] MyNewPasswordData = Encoding.Default.GetBytes(MyNewPassword);
            //生成密码字符串的哈希码
            byte[] MyNewHash = MyHashAlgorithm.ComputeHash(MyNewPasswordData);
            //显示密码对应的哈希码
            string MyNewPW = BitConverter.ToString(MyNewHash);
            string MyOldPassword = this.旧密码TextBox.Text;            
            byte[] MyOldPasswordData = Encoding.Default.GetBytes(MyOldPassword);
            byte[] MyOldHash = MyHashAlgorithm.ComputeHash(MyOldPasswordData);
            string MyOldPW = BitConverter.ToString(MyOldHash);
            String MySQLConnectionString = global::MyCommunity.Properties.Settings.Default.DBCommunityConnectionString;
            string MySQL = "Update  操作用户 Set 用户密码='" +MyNewPW + "' Where 用户名称='" + this.用户名称TextBox.Text + "' AND 用户密码='" +MyOldPW + "'";
            SqlConnection MyConnection = new SqlConnection(MySQLConnectionString);
            SqlCommand MyCommand = new SqlCommand(MySQL, MyConnection);
            MyCommand.Connection.Open();
            int MyCount = MyCommand.ExecuteNonQuery();
            if (MyCount == 1)
            {
                MessageBox.Show("在数据库中修改用户密码操作成功！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                MessageBox.Show("在数据库中修改用户密码操作失败！", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            if (MyConnection.State == ConnectionState.Open)
            {
                MyConnection.Close();
            }
        }
    }
}