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 WindowsFormsApp6
{
    public partial class MainForm : Form
    {     

        public MainForm()
        {
            InitializeComponent();


        }

        //private void SwitchToForm<T>() where T : Form, new()
        //{
        //    T form = new T();
        //    // 处理窗体关闭事件
        //    form.FormClosed += (s, args) =>
        //    {
        //        this.Show();  // 显示主窗体
        //        this.Activate();  // 激活主窗体
        //    };

        //    form.Show();
        //    this.Hide();
        //}
        private void SwitchToForm<T>() where T : Form, new()
        {
            using (T form = new T())
            {
                this.Hide();
                form.ShowDialog();
                this.Show();
                this.Activate();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.SwitchToForm<Form1>();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            this.SwitchToForm<Form2>();
        }

        private void MainForm_FormClosing(object sender, FormClosingEventArgs e)
        {
            // 退出应用程序
            Application.Exit();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            this.SwitchToForm<Form3>();
        }
    }
}