如何实现按住按钮 拖动 窗体 没有标题栏 就是一个悬浮小窗体

Question

如题，刚入手c#，望多指教！万分感谢！

Answer 1

using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;namespace aaaa
{
    public partial class Form1 : Form
    {
        Point oldPoint;        public Form1()
        {
            InitializeComponent();
            oldPoint = new Point();
            this.FormBorderStyle = FormBorderStyle.None;
        }        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            oldPoint.X = e.X;
            oldPoint.Y = e.Y;
        }        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                this.Left += (e.X - oldPoint.X);
                this.Top += (e.Y - oldPoint.Y);
            }
        }        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}