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 = );
             e.Graphics.DrawLine(pen, , ), , ));   //上
             e.Graphics.DrawLine(pen, , ), , ));  //左
             e.Graphics.DrawLine(pen, , ), , ));//右
             e.Graphics.DrawLine(pen, , ), , ));//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;
             }
         }

     }
 }