Winform 无边框窗口移动自定义边框粗细颜色

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 WinGPChat.master
{
    public partial class formBase : Form
    {
        public formBase()
        {
            InitializeComponent();            
        }
        private Point mPoint = new Point();
        private void formBase_Load(object sender, EventArgs e)
        {
            this.MouseDown+=formBase_MouseDown;
            this.MouseMove+=formBase_MouseMove;            
        }

        protected void formBase_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                Point myPosittion = MousePosition;
                myPosittion.Offset(-mPoint.X, -mPoint.Y);
                this.FindForm().Location = myPosittion;
            }
        }

        protected void formBase_MouseDown(object sender, MouseEventArgs e)
        {
            mPoint.X = e.X;
            mPoint.Y = e.Y;
        }

        /// <summary>
        /// 重写Paint实现细边框
        /// </summary>
        /// <param name="e"></param>
        protected override void OnPaint(PaintEventArgs e)
        {
            Pen pen = new Pen(Color.Gray,1);
            e.Graphics.DrawLine(pen, new Point(0, 0), new Point(this.Width-1, 0));   //上
            e.Graphics.DrawLine(pen, new Point(0, 0), new Point(0, this.Height-1));  //左
            e.Graphics.DrawLine(pen, new Point(this.Width-1, 0), new Point(this.Width-1, this.Height-1));//右
            e.Graphics.DrawLine(pen, new Point(0, this.Height-1), new Point(this.Width-1, this.Height-1));//下
            base.OnPaint(e);
        }

        /// <summary>
        /// 无边框重写点击icon实现窗体最大化和最小化
        /// </summary>
        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cp = base.CreateParams;
                cp.Style = cp.Style | 0x20000;//允许最小化操作
                return cp;
            }
        }

           
    }
}