C#如何实现Listbox自绘功能

小编给大家分享一下C#如何实现Listbox自绘功能，希望大家阅读完这篇文章之后都有所收获，下面让我们一起去探讨吧！

使用控件的DrawMode属性来实现控件的自绘，首先将C# Listbox的DrawMode设置为OwnerDrawVariable，然后实现DrawItem ,MeasuerItem方法。

编写如下代码：

private void listBox1_DrawItem(object sender, DrawItemEventArgs e)        {            e.DrawBackground();            Rectangle r = new Rectangle(0, 0, lbCustomDraw.Width, 100);            bool selected = ((e.State & DrawItemState.Selected) == DrawItemState.Selected);            LinearGradientBrush lgb = null;            if (!selected)            {                lgb = new LinearGradientBrush(r, Color.Red, Color.Yellow, LinearGradientMode.Horizontal);            }            else           {                lgb = new LinearGradientBrush(r, Color.Cyan, Color.White, LinearGradientMode.Horizontal);            }            e.Graphics.FillRectangle(lgb, e.Bounds);            e.Graphics.DrawRectangle(SystemPens.WindowText, e.Bounds);            Rectangle r2 = e.Bounds;            string displayText = (string)lbCustomDraw.Items[e.Index];            SizeF size = e.Graphics.MeasureString(displayText, this.Font);            r2.Y = (int)(r2.Height / 2) - (int)(size.Height / 2) + e.Bounds.Y;            r2.X = 2;            e.Graphics.DrawString(displayText, this.Font, Brushes.Black, r2);            e.DrawFocusRectangle();        }        private void listBox1_MeasureItem(object sender, MeasureItemEventArgs e)        {            string displayText = (string)lbCustomDraw.Items[e.Index];            SizeF size = e.Graphics.MeasureString(displayText, this.Font);            size.Height += 10;            e.ItemHeight = (int)size.Height;        }

最终效果：

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