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 WindowsForms
{
    public partial class FormMain : Form
    {
        public FormMain()
        {
            InitializeComponent();
        }

        private void FormMain_Load(object sender, EventArgs e)
        {
            //窗体最小化显示
            this.WindowState = FormWindowState.Minimized;
            //不显示在任务栏中
            this.ShowInTaskbar = false;           
        }

        /// <summary>
        /// 让程序不显示在alt+Tab视图窗体中
        /// </summary>
        protected override CreateParams CreateParams
        {
            get
            {
                const int WS_EX_APPWINDOW = 0x40000;
                const int WS_EX_TOOLWINDOW = 0x80;
                CreateParams cp = base.CreateParams;
                cp.ExStyle &= (~WS_EX_APPWINDOW);    // 不显示在TaskBar
                cp.ExStyle |= WS_EX_TOOLWINDOW;      // 不显示在Alt+Tab
                return cp;
            }
        }
    }
}