public WSNTabControlRender(WSNTabControl tabControl) { if (tabControl == null) { throw new ArgumentNullException("WSNTabControl 对象为空!"); } else { _owner = tabControl; } leftRightImages = new ImageList(); Bitmap updownImage = new Bitmap(typeof(WSNTabControl), "TabIcons.bmp");//((System.Drawing.Bitmap)(resources.GetObject("TabIcons.bmp"))); if (updownImage != null) { updownImage.MakeTransparent(Color.White); leftRightImages.Images.AddStrip(updownImage); } }