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winform--记住密码 收藏 

要引用IO包

private string accountFilePath = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData) +"\\accounts.dat ";

private IDictionary<string, string> accounts = new SortedList<string, string>();

/// <summary>
        /// 记住密码
        /// </summary>
        private void ReloadAccounts()
        {
            this.txtUserName.AutoCompleteCustomSource.Clear();
            accounts.Clear();
            if (!File.Exists(accountFilePath))
            {
                return;
            }
            using (StreamReader reader = new StreamReader(accountFilePath))
            {
                while (true)
                {
                    string username = reader.ReadLine();
                    if (string.IsNullOrEmpty(username)) break;
                    string password = reader.ReadLine();
                    if (string.IsNullOrEmpty(password)) break;
                    accounts.Add(username, password);
                    txtUserName.AutoCompleteCustomSource.Add(username);
                }
            }
        }

/// <summary>
        /// 登录事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnLogin_Click(object sender, EventArgs e)
        {
            if (accounts.ContainsKey(this.txtUserName.Text))
            {
                accounts[this.txtUserName.Text] = this.txtUserPass.Text;
            }
            else
            {
                accounts.Add(this.txtUserName.Text, this.txtUserPass.Text);
            }

            using (StreamWriter writer = new StreamWriter(accountFilePath))
            {
                foreach (KeyValuePair<string, string> account in accounts)
                {
                    writer.WriteLine(account.Key);
                    writer.WriteLine(account.Value);
                }
            }

            ReloadAccounts();

            string user = this.txtUserName.Text.Trim();  
            //加密
            string bbb = Crypto.EncryptData("jm", this.txtUserPass.Text.Trim());
            string pwd = bbb;

            string filter = "username='" + user + "'" + " and password='" + pwd + "'";

            DataTable loginTable = manager.selectAll("userlist", "*", filter);

            if (this.txtUserName.Text.Trim() == "" || bbb == "")
            {
                MessageBox.Show("用户名或密码不能为空！");
                this.txtUserName.Focus();
            }
            else if (loginTable.Rows.Count == 0)
            {
                MessageBox.Show("用户名或密码错误！");
                this.txtUserName.Focus();
            }
            else
            {
                MessageBox.Show("登录成功！");
            }
        }  

        //当鼠标离开用户名时自动获得密码
        private void txtUserName_Leave(object sender, EventArgs e)
        {
            string password = string.Empty;
            if (accounts.TryGetValue(this.txtUserName.Text, out password))
                this.txtUserPass.Text = password;
        }



本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zhangjianjianjianjia/archive/2009/11/06/4776397.aspx