C# winform实现记住用户登录的登录状态

namespace DMS
{
    public class LoginInfo
    {
        public string AccountID
        {
            set;
            get;
        }

        public string AccountPassWord
        {
            set;
            get;
            
        }

        public DateTime AccountLoginTime
        {
            set;           
            get;
            
        }
        private static LoginInfo _CurrentUser = null;
        public static LoginInfo CurrentUser
        {
            get
            {
                if(_CurrentUser == null)
                {
                    _CurrentUser = new LoginInfo();
                }
                return _CurrentUser;
            }
        }


    }
}

namespace DMS
{
    public partial class 登录界面 : Form
    {
        public 登录界面()
        {
            InitializeComponent();
        }
        private void buttonAdmin_Click(object sender, EventArgs e)
        {
            if(textBoxUserName.Text.Trim() != "" || textBoxPassWord.Text.Trim() != "")
            {

           //连接数据库进行比对……
             //进行准备   
                try//开始比对
                {
                    conn.Open();
                    SqlDataReader reader = cmd.ExecuteReader();
                    reader.Read();
                    if (reader.HasRows)//存在账户
                    {
                        /*下面四行是重点*/
                        LoginInfo.CurrentUser.AccountID = textBoxUserName.Text.Trim();
                        LoginInfo.CurrentUser.AccountPassWord = textBoxPassWord.Text.Trim();
                        LoginInfo.CurrentUser.AccountLoginTime = DateTime.Now;
                        //这里记得得把LoginInfo的实例传进下一个界面不然下一个界面就得不到当前登录信息
                        管理员父界面 adminMain = new 管理员父界面(LoginInfo.CurrentUser); 
                        this.Hide();
                        adminMain.Show();
                    }
                    else
                    {
                        MessageBox.Show("用户名或者密码错误！", "提示");
                        textBoxUserName.Text = "";
                        textBoxPassWord.Text = "";
                        textBoxUserName.Focus();
                    }
                    reader.Close();
                }
                catch (SqlException ex)
                {
                    MessageBox.Show("DMS出现了一个错误：" + ex.Message);
                }
                finally
                {
                    conn.Close();

                }


            }
            else MessageBox.Show("用户名或密码为空，请重新输入！", "提示");
        }

        
}