如何在ToolStrip上渲染图形

using System;
using System.Drawing;
using System.Windows.Forms;

namespace ToolStripGraphicsRendering
{
    public class CustomToolStripRenderer : ToolStripRenderer
    {
        protected override void OnRenderToolStripBackground(ToolStripRenderEventArgs e)
        {
            // 自定义背景渲染
            using (var brush = new SolidBrush(Color.LightBlue))
            {
                e.Graphics.FillRectangle(brush, e.AffectedBounds);
            }
        }

        protected override void OnRenderToolStripBorder(ToolStripRenderEventArgs e)
        {
            // 自定义边框渲染
            using (var pen = new Pen(Color.DarkBlue, 2))
            {
                e.Graphics.DrawRectangle(pen, new Rectangle(0, 0, e.ToolStrip.Width - 1, e.ToolStrip.Height - 1));
            }
        }

        protected override void OnRenderButtonBackground(ToolStripItemRenderEventArgs e)
        {
            // 自定义按钮背景渲染
            var button = e.Item as ToolStripButton;
            if (button != null && button.Checked)
            {
                using (var brush = new SolidBrush(Color.Yellow))
                {
                    e.Graphics.FillRectangle(brush, e.Item.ContentRectangle);
                }
            }
            else
            {
                base.OnRenderButtonBackground(e);
            }
        }

        protected override void OnRenderItemImage(ToolStripItemImageRenderEventArgs e)
        {
            // 自定义图像渲染
            var image = e.Item.Image;
            if (image != null)
            {
                e.Graphics.DrawImage(image, e.ImageRectangle);
            }
        }

        protected override void OnRenderSeparator(ToolStripSeparatorRenderEventArgs e)
        {
            // 自定义分隔符渲染
            using (var pen = new Pen(Color.Gray, 1))
            {
                int x = e.Item.Width / 2;
                e.Graphics.DrawLine(pen, x, 4, x, e.Item.Height - 5);
            }
        }
    }

    public partial class MainForm : Form
    {
        public MainForm()
        {
            InitializeComponent();
        }

        private void MainForm_Load(object sender, EventArgs e)
        {
            // 将自定义的ToolStripRenderer分配给ToolStrip控件的Renderer属性
            toolStrip1.Renderer = new CustomToolStripRenderer();
        }
    }
}