窗体间传值（winform）

User.cs文件

using System;
using System.Collections.Generic;
using System.Text;

namespace workpeople
{
    public class User
    {
        private int _ID;
        public int ID
        {
            get { return _ID; }
            set { _ID = value; }
        }

        private string _UserName;
        public string UserName
        {
            get { return _UserName; }
            set { _UserName = value; }
        }

        private string _Password;
        public string Password
        {
            get { return _Password; }
            set { _Password = value; }
        }

    }
}

 

FrmLogin.cs文件

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;
using System.IO;

 

namespace workpeople
{
   
    public partial class FrmLogin : Form
    {
        private MySqlCommand mycomm;
        private MySqlDataAdapter myadap;
        private MySqlDataReader dr;
        public FrmLogin()
        {
            InitializeComponent();
        }

        private void btnOK_Click(object sender, EventArgs e)
        {
           
            //string M_str_sqlcon = "server=localhost;user id=mm03;password=mm03123;database=studb";
            //MySqlConnection myCon = new MySqlConnection(M_str_sqlcon);
         
            //myCon.Open();

            //string sql = "select uname as 用户名,paswd as 密码 from uinfo";
            //mycomm = new MySqlCommand(sql, myCon);
            //MySqlDataAdapter myadap = new MySqlDataAdapter(mycomm);
            //DataSet ds = new DataSet();
            //myadap.Fill(ds, "uinfo");
            //dataGridView1.DataSource = ds.Tables[0].DefaultView;
           
            ////dr = mycomm.ExecuteReader();

            ////while (dr.Read())
            ////{
            ////    MessageBox.Show(dr["uname"].ToString());
            ////}
            ////mycomm.Dispose();
            //myCon.Close();

            User user = new User();
            user.UserName = txtUsername.Text.Trim();
            user.Password = txtPassword.Text;

            this.Tag = user;

          this.DialogResult = DialogResult.OK;  //如果验证通过，则转到系统主界面

        }

        private void FrmLogin_Load(object sender, EventArgs e)
        {

         

        }
       
    }
}

 

FrmMain.cs文件

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

namespace workpeople
{
    public partial class FrmMain : Form
    {
        public FrmMain()
        {
            InitializeComponent();
        }

        private void FrmMain_Load(object sender, EventArgs e)
        {
            FrmLogin frm = new FrmLogin();
            if (frm.ShowDialog(this) == DialogResult.OK)
            {
                User user = frm.Tag as User;

                this.Text += string.Format("-  欢迎：  {0}", user.UserName);
            }
            else
            {
                this.Close();
            }

        }
    }
}