实现效果：

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 NoBorderForm
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {
        }
        Point mouseOff;//鼠标移动位置变量
        bool leftFlag;//标记是否为左键
        private void Form1_MouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                mouseOff = new Point(-e.X, -e.Y); //得到变量的值
                leftFlag = true;                  //点击左键按下时标注为true;
            }
        }
        private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                Point mouseSet = Control.MousePosition;
                mouseSet.Offset(mouseOff.X, mouseOff.Y);  //设置移动后的位置
                Location = mouseSet;
            }
        }
        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            if (leftFlag)
            {
                leftFlag = false;//释放鼠标后标注为false;
            }
        }
        private void button1_Click(object sender, EventArgs e)
        {
            DialogResult dr = MessageBox.Show("yes/no", "exit", MessageBoxButtons.YesNo, MessageBoxIcon.Warning);
            if (dr == DialogResult.Yes)
            {
                this.Close();
            }
            else
            {
                return;
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            this.WindowState = FormWindowState.Minimized;
        }
        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
        }
        private void Form1_Click(object sender, EventArgs e)
        {
        }
        private void panel1_Click(object sender, EventArgs e)
        {
        }
        private void textBox1_Click(object sender, EventArgs e)
        {
        }
        private void linkLabel1_LinkClicked(object sender, LinkLabelLinkClickedEventArgs e)
        {
            System.Diagnostics.Process.Start("http://www.baidu.com");
        }
        private void button4_Click(object sender, EventArgs e)
        {
        }
    }
}

注意：设置属性FormBorder=None，并在需要拖动的控件上分别添加MouseDown、MouseMove、MouseUp事件

原文链接：https://www.idaobin.com/archives/964.html

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