ScanClient/code/HXX.Scanner.Client/UI/TransparentPanel.cs

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

namespace HXX.Scanner.Client.UI
{

    public class TransparentPanel : Panel
    {
        protected override CreateParams CreateParams
        {
            get
            {
                CreateParams cp = base.CreateParams;
                cp.ExStyle |= 0x00000020; // WS_EX_TRANSPARENT
                return cp;
            }
        }

        protected override void OnPaintBackground(PaintEventArgs e)
        {
            // 不绘制背景
        }

        public TransparentPanel()
        {
            this.BackColor = Color.FromArgb(125, Color.Black); // 半透明黑色
        }
    }
}