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pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;//加载的图片自适应picrurebox大小

    //创建OpenFileDialog
            OpenFileDialog opnDlg = new OpenFileDialog();
            //为图像选择一个筛选器
            opnDlg.Filter = "所有图像文件|*.bmp;*.pcx;*.png;*.jpg;*.gif;" +
                "*.tif;*.ico;*.dxf;*.cgm;*.cdr;*.wmf;*.eps;*.emf|" +
                "位图(*.bmp;*.jpg;*.png;...)|*.bmp;*.pcx;*.png;*.jpg;*.gif;*.tif;*.ico|" +
                "矢量图(*.wmf;*.eps;*.emf;..)|*.dxf;*.cgm;*.cdr;*.wmf;*.eps;*.emf";
            //设置对话框标题
            opnDlg.Title = "打开图像文件";
            //启用帮助按钮
            opnDlg.ShowHelp = true;
            //如果选择的结果为打开，则选定文件
            if (opnDlg.ShowDialog() == DialogResult.OK)
            {
                //读取当前选中的文件地址
                curFileName = opnDlg.FileName;
                //Image image = Image.FromFile(curFileName);
                this.pictureBox1.Load(curFileName);
                pictureBox1.SizeMode = PictureBoxSizeMode.Zoom;//加载的图片自适应picrurebox大小
            }
            try
            {
                //使用 Image.FromFile创建图像对象；
                curBitmap = (Bitmap)System.Drawing.Image.FromFile(curFileName);
            }
            catch (Exception ex)
            {
                //显示异常；
                MessageBox.Show(ex.Message);
            }
            Invalidate();