C# 隐形窗体 示例源码(没有边框，没有标题栏)

【实例截图】

【核心代码】

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace 掌上川电其他窗体_UI
{
    public partial class Form2 : Form
    {
        public Form2()
        {
            InitializeComponent();
            MouseDown  = new MouseEventHandler(OnMouseDown);
            MouseMove  = new MouseEventHandler(OnMouseMove);
        }

        protected override void OnLoad(EventArgs e)
        {
            dat.Add(new PointF(0, 0));
            dat.Add(new PointF(Width, Height / 2));
            dat.Add(new PointF(Width / 2, Height));
        }
        List<PointF> dat = new List<PointF>();
        protected override void OnPaint(PaintEventArgs e)
        {
            base.OnPaint(e);
            //SendToBack();
            BringToFront();
            Graphics g = e.Graphics;
            g.SmoothingMode = SmoothingMode.AntiAlias;
            using (var path = new GraphicsPath())
            {
                path.AddLines(dat.ToArray());

                g.DrawPath(Pens.Red, path);
                path.Widen(new Pen(Color.Green, 1));
                Region = new Region(path);

            }
        }
        int ox, oy;
        void OnMouseDown(object sender, MouseEventArgs e)
        {
            ox = e.X;
            oy = e.Y;
            BringToFront();
        }
        void OnMouseMove(object sender, MouseEventArgs e)
        {
            Cursor = Cursors.Hand;
            if (e.Button == MouseButtons.Left)
            {
                Top  = e.Y - oy;
                Left  = e.X - ox;
            }
        }

        private void Form2_Load(object sender, EventArgs e)
        {

        }
    }
}