private void InsertImage()        {            OpenFileDialog openImageDlg = new OpenFileDialog();            openImageDlg.Filter = "所有图片(*.bmp,*.gif,*.jpg)|*.bmp;*.gif;*jpg";            openImageDlg.Title = "选择图片";            Bitmap bmp;            if (openImageDlg.ShowDialog() == DialogResult.OK)            {                string fileName = openImageDlg.FileName;                if (null == fileName || fileName.Trim().Length == 0)                    return;                try                {                    bmp = new Bitmap(fileName);                    Clipboard.SetDataObject(bmp);                    DataFormats.Format dataFormat =                        DataFormats.GetFormat(DataFormats.Bitmap);                    if (curRichTextBox.CanPaste(dataFormat))                        curRichTextBox.Paste(dataFormat);                }                catch (Exception exc)                {                    MessageBox.Show("图片插入失败。" + exc.Message, "提示",                                    MessageBoxButtons.OK, MessageBoxIcon.Information);                }            }        }