Question

有没有人知道在WinForms C＃中将图像背景插入ListBox的方法？

Answer 1

好吧，你必须从ListBox继承一个新的控件。为此，在您的解决方案中创建一个“Windows Control Library”类型的新项目，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);
   }
}

为了简洁起见，我省略了所有设计器代码，但是您必须记住控件的Dispose方法中的图像和画笔的Dispose。

设置WinForm ListBox的背景

1 个答案: