关键点:
在MeasureItem事件中改变HorizontalExtent的值, 如果HorizontalExtent比listbox的width大,就会出来水平滚动条.
首先设置listbox.HorizontalScrollbar=true, listbox.DrawMode=OwnerDrawVariable,然后在HorizontalExtent事件中的代码如下:
private void lstT96_MeasureItem(object sender, MeasureItemEventArgs e) { if (!(lstT96.Items[e.Index] is T96ToDisplay)) return; String lvsDisp = ((T96ToDisplay)lstT96.Items[e.Index]).ToString(); SizeF lvSize= mvGraphics.MeasureString(lvsDisp, lstT96.Font); if (lstT96.HorizontalExtent < lvSize.Width) { lstT96.HorizontalExtent =(int) lvSize.Width; } e.ItemHeight = (int)lvSize.Height; e.ItemWidth = (int)lvSize.Width; }
将让listbox.HorizontalExtent设置为List的最大长度.