将MemoryStream用于数组

Question

我不断收到异常消息

  

值不能为空参数名称：编码器

这似乎是由行开始

触发的

“图片Box3.Image.Save（ms ....”等

我使用pictureBox3来保存裁剪的位图，我想把它放到DataGridView1中，还有一些注释和参考。有没有人对我遇到这些问题有什么建议。非常感谢Steve

private void btnsavenote_click(object sender, EventArgs e)
{
  if (panel3.BackgroundImage != null)
  {
    try
    {
      //  crop showimagefn.Text at xloc, yloc ,708,530 
      Image croparea = Image.FromFile(showimagefn.Text);
      Bitmap croppedBitmap = new Bitmap(croparea);
      croppedBitmap = croppedBitmap.Clone  (new Rectangle(((-xloc) - (708 / 2)), ((-yloc) - (530 / 2)), 708, 530), System.Drawing.Imaging.PixelFormat.Format24bppRgb); //
      pictureBox3.Visible = true;
      pictureBox3.Image = croppedBitmap;

      MemoryStream ms = new MemoryStream();
      pictureBox3.Image.Save(ms, pictureBox3.Image.RawFormat);
      byte[] imgbyte = ms.ToArray();
      dataGridView1.Rows.Add(surveyreportRef, (this.insertnote.Text), imgbyte); //
      surveyreportRef++;
      croppedBitmap.Dispose();
      }
      catch (Exception ex)
      {
          MessageBox.Show(ex.Message);
      }
}