c# - 设置WinForm ListBox的背景

Question

有人知道在 WinForms C# 中将背景图像插入列表框的方法吗？

Answer 1

好吧，您必须从 ListBox 继承一个新控件。为此，在您的解决方案中创建一个类型为“Windows 控件库”的新项目，并在文件控件的源代码文件中使用以下代码:

public partial class ListBoxWithBg : ListBox
{
   Image image;
   Brush brush, selectedBrush;

   public ListBoxWithBg()
   {
       InitializeComponent();

       this.DrawMode = DrawMode.OwnerDrawVariable;
       this.DrawItem += new DrawItemEventHandler(ListBoxWithBg_DrawItem);
       this.image = Image.FromFile("C:\\some-image.bmp");
       this.brush = new SolidBrush(Color.Black);
       this.selectedBrush = new SolidBrush(Color.White);
   }

   void ListBoxWithBg_DrawItem(object sender, DrawItemEventArgs e)
   {
       e.DrawBackground();
       e.DrawFocusRectangle();
       /* HACK WARNING: draw the last item with the entire image at (0,0) 
        * to fill the whole ListBox. Really, there's many better ways to do this,
        * just none quite so brief */
       if (e.Index == this.Items.Count - 1)
       {
           e.Graphics.DrawImage(this.image, new Point(0, 0));
       }
       else
       {
           e.Graphics.DrawImage(this.image, e.Bounds, e.Bounds, GraphicsUnit.Pixel);
       }
       Brush drawBrush = 
           ((e.State & DrawItemState.Selected) == DrawItemState.Selected) 
           ? this.selectedBrush : this.brush;
       e.Graphics.DrawString(this.Items[e.Index].ToString(), this.Font, drawBrush, e.Bounds);
   }
}

为简洁起见，我省略了所有设计器代码等，但您必须记住在控件的 Dispose 方法中对图像和画笔进行 Dispose .