第一次在CSDN发贴，以前只是看贴不回贴
还请大家指点一二

，在pictureBox1_Paint事件中用Graphics绘图后
，如何保存pictureBox1中的图像?

在pictureBox1_Paint事件中绘制完毕后
pictureBox1.Image依然=null

e.Graphics.DrawLine绘制的图像没有反应到image中去么？

pictureBox1_Paint事件过后
我在另一个按钮里调用 ，
pictureBox1.Image.Save(“c:\a.bmp”);
则失败，此时image=null

我也试过这样弄，

            Bitmap bmp=new Bitmap(200,500);
            Graphics g = Graphics.FromImage(bmp); ;// e.Graphics;
            //横网格
            Pen backpen = new Pen(Color.FromArgb(cIDE_INFO.colorBack.ToArgb()-0x00404040));   //背景色变暗40
            backpen.DashStyle = DashStyle.Custom; //.DashDotDot;
            backpen.DashPattern = new float[] { 1, 6 };
            for (float i = cIDE_INFO.ideCodeSize.Height / 2; i < pictureBox1.Height; i += cIDE_INFO.ideCodeSize.Height)
            {
                g.DrawLine(backpen, 0, i, pictureBox1.Width, i);
            }
            //竖网格
            for (float i = cIDE_INFO.ideCodeSize.Width / 2; i < cIDE_INFO.ideCodeVnum * cIDE_INFO.ideCodeSize.Width; i += cIDE_INFO.ideCodeSize.Width)
            {
                g.DrawLine(backpen, i, 0, i, pictureBox1.Height);
            }
            //画指令
            //todo:要翻页
            Point tp=new Point();
            foreach (ArrayList tzls in ide_all_zls)
            {
                tp.X = 0;
                foreach (object tzl in tzls)
                {
                    cIDE_INFO.ideDrawMove(tp, g);
                    if (tzl != null)
                    {
                        if (tzl.GetType() == typeof(ide.code_type))
                        {
                            cIDE_INFO.DrawZL((ide.code_type)tzl, g);
                            if (((ide.code_type)tzl).分支 == true)
                            {
                                cIDE_INFO.ideDrawMove(tp, g);
                                cIDE_INFO.DrawV(g);
                            }
                        }
                        else if (tzl.GetType() == typeof(string))
                        {
                            string tstr = (string)tzl;
                            if (tstr.IndexOf("H") >= 0)
                            {
                                cIDE_INFO.DrawH(g);
                            }
                        }
                    }
                    tp.X++;
                }
                tp.Y++;
            }
            //画当前插入点 反色处理
            g.ResetTransform();
  
            pictureBox1.Image = bmp;

这样pictureBox1.Image有东西了，可以保存了了，但似乎很卡，最小化，最大化时，即产生重绘事件时，
我主界面上的工具栏也重绘不了啦，
像如图所示

正常的：

异常的：