namespace 启动系统服务

{

    [ToolboxBitmap(typeof(PanelAlphaEx))]

    public partial class PanelAlphaEx : UserControl

    {

        public PanelAlphaEx()

        {

            InitializeComponent();

            this.SetStyle(ControlStyles.Opaque, true);

            this.CreateControl();

            this.SetStyle(ControlStyles.ResizeRedraw, false);

        }

        #region 透明配置



        // 属性设置

        private bool _transparentBG = true;

        private int _alpha = 125;

        [Category("透明层设置"), Description("是否使用透明,默认为True")]

        public bool TransparentBG { get { return _transparentBG; } set { _transparentBG = value; } }

        [Category("透明层设置"), Description("设置透明度")]

        public int Alpha { get { return _alpha; } set { _alpha = value; } }



        #endregion



        /// <summary>

        /// 开启 WS_EX_TRANSPARENT,使控件支持透明

        /// </summary>

        protected override CreateParams CreateParams

        {

            get

            {

                CreateParams cp = base.CreateParams;

                //cp.ExStyle |= 0x20;

                cp.ExStyle |= 0x00000020;

                return cp;

            }

        }

        protected override void OnPaint(PaintEventArgs e)

        {

            Color drawColor = _transparentBG ? Color.FromArgb(this._alpha, this.BackColor) : this.BackColor;

            Pen penBorder = new Pen(drawColor, 0);

        &nb