第一章魔兽窗口

开始显示第一个窗体

用户直接点登陆的话就会提示用户名不能为空密码不能为空

没有账号的话只能先注册，点击蓝色摁钮进入下一个窗体

 这里有判断是否为空，注册成功后利用窗体传值，并且打开第一个窗口

把注册的用户名和密码写上去就可以的登陆到这个了

 窗口一代码：

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

namespace Loging
{
    public partial class Form2 : Form
    {
        public  string mile;
        public  string pwd;
        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            Form3 f3=new Form3();
            
            if (textBox1.Text == "" || textBox2.Text == "") {
                MessageBox.Show("用户名或密码不能为空！", "提示");
            }
            else if (textBox1.Text == mile && textBox2.Text ==pwd)
            { 
            
            Form1 f1=new Form1();
            f1.Show();
            }

        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void label4_Click(object sender, EventArgs e)
        {
            Form3 f3 = new Form3();
            f3.Show();
        }
    }
}

  窗口二代码：

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

namespace Loging
{
    public partial class Form3 : Form
    {
      
        public Form3()
        {
            InitializeComponent();
        }
        public static string mile;
        public static string pwd;
        private void lbls_Click(object sender, EventArgs e)
        {

        }

        private void lblpwd_Click(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (textBox1.Text == "")
            {
                MessageBox.Show("姓名不能为空", "提示");

            }
            else if (textBox3.Text == "") {
                MessageBox.Show("身份证号不能为空", "提示");
            }
            else if (textBox2.Text == "") {

                MessageBox.Show("邮箱地址不能为空", "提示");
            }
            else if (textBox4.Text == "")
            {
                MessageBox.Show("密码不能为空", " 提示");
            }
            else if (textBox5.Text == "") {
                MessageBox.Show("请再次输入邮箱", "提示");
            }
            else if (textBox6.Text == "")
            {
                MessageBox.Show("请再次输入密码", "提示");
            }
            else {
                
                MessageBox.Show("注册成功", "提示");
               
                Form2 f2 = new Form2();
                f2.mile = textBox2.Text;
                f2.pwd = textBox4.Text;
                f2.Show();
            }
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.Close();
        }

        private void Form3_Load(object sender, EventArgs e)
        {

        }

    }
}

窗口三代码：

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

namespace Loging
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }
    }
}