/// <summary>
        /// 透明Label控件
        ///     注意，将Label的Visible设置为false;适合背景为图片(PictureBox)
        /// </summary>
        /// <param name="label"></param>
        /// <param name="g"></param>
        public static void TransparentLabel(Label label, Graphics g)
        {
            Rectangle rect = label.Bounds;
            SolidBrush sb = new SolidBrush(label.ForeColor);
            SizeF size;
            //计算字符串的位置
            switch (label.TextAlign)
            {
                case ContentAlignment.TopLeft:
                    break;
                case ContentAlignment.TopCenter:
                    //计算字符串长度
                    size = g.MeasureString(label.Text, label.Font);
                    rect.X += (int)((rect.Width - size.Width) / 2);
                    rect.Y += (int)((rect.Height - size.Height) / 2);
                    break;
                case ContentAlignment.TopRight:
                    size = g.MeasureString(label.Text, label.Font);
                    rect.X += rect.Width - (int)size.Width;
                    rect.Y += rect.Height - (int)size.Height;
                    break;
            }
            g.DrawString(label.Text, label.Font, sb, rect);
            sb.Dispose();
        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            TransparentLabel(this.label1, e.Graphics);
        }

        /// <summary>
        /// 绘制透明图片
        /// </summary>
        /// <param name="gxBuffer"></param>
        /// <param name="barImage"></param>
        /// <param name="barRect"></param>
        /// <param name="transp"></param>
        public static void DrawAlpha(Graphics gxBuffer, Image barImage, Rectangle barRect, byte transp)
        {
            using (Graphics gxSrc = Graphics.FromImage(barImage))
            {
                IntPtr hdcDst = gxBuffer.GetHdc();
                IntPtr hdcSrc = gxSrc.GetHdc();
                BlendFunction blendFunction = new BlendFunction();
                blendFunction.BlendOp = (byte)BlendOperation.AC_SRC_OVER;
                blendFunction.BlendFlags = (byte)BlendFlags.Zero;
                blendFunction.SourceConstantAlpha = transp;
                blendFunction.AlphaFormat = (byte)0;
                AlphaBlend(hdcDst, barRect.Left, barRect.Top, barRect.Size.Width, barRect.Size.Height, hdcSrc, 0, 0, barImage.Width, barImage.Height, blendFunction);
                gxBuffer.ReleaseHdc(hdcDst);
                gxSrc.ReleaseHdc(hdcSrc);
            }
        }

/// <summary>
        /// 绘制透明图象
        /// </summary>
        /// <param name="hdcDest">生成画面的Handle</param>
        /// <param name="xDest">生成画面的x</param>
        /// <param name="yDest">生成画面的y</param>
        /// <param name="cxDest">生成画面的width</param>
        /// <param name="cyDest">生成画面的height</param>
        /// <param name="hdcSrc">原图的Handle</param>
        /// <param name="xSrc">原图的x</param>
        /// <param name="ySrc">原图的y</param>
        /// <param name="cxSrc">原图的width</param>
        /// <param name="cySrc">原图的height</param>
        /// <param name="blendFunction">控制 Alpha 混合的结构</param>
        /// <returns></returns>
        [DllImport("coredll.dll")]
        extern public static Int32 AlphaBlend(IntPtr hdcDest, Int32 xDest, Int32 yDest, Int32 cxDest, Int32 cyDest, IntPtr hdcSrc, Int32 xSrc, Int32 ySrc, Int32 cxSrc, Int32 cySrc, BlendFunction blendFunction);

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            CFControlUtility.DrawAlpha(e.Graphics, pbBar.Image, pbBar.Bounds, 170);
        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            Bitmap offBitmap = new Bitmap(100, 100);
            Graphics gxBuffer = Graphics.FromImage(offBitmap);
            //清空底色
            gxBuffer.Clear(this.BackColor);

Pen pen = new Pen(Color.DodgerBlue);
            Font font = new Font("Arial", 10, FontStyle.Regular);
            SolidBrush brush = new SolidBrush(Color.Black);

int width, height = 0;
            //绘制2列4行数据
            for (int i = 0; i < 4; i++)
            {
                width = 0;
                for (int j = 0; j < 2; j++)
                {
                    //绘制数据
                    gxBuffer.DrawString("测试数据", font, brush, width, height);

width += 50;
                    //绘制竖线
                    if (i == 0)
                        gxBuffer.DrawLine(pen, width, 0, width, offBitmap.Height);
                    
                }
                height += 25;
                //绘制横线
                gxBuffer.DrawLine(pen, 0, height, offBitmap.Width, height);
            }

brush.Dispose();
            font.Dispose();
            pen.Dispose();
            gxBuffer.Dispose();

//将内存中的图片绘制到界面上来
            DrawAlpha(e.Graphics, offBitmap, new Rectangle(50, 100, offBitmap.Width, offBitmap.Height), 170);
            //e.Graphics.DrawImage(offBitmap, 50, 100);
        }

        protected override void OnPaintBackground(PaintEventArgs e)
        {
            //base.OnPaintBackground(e);        
        }