将图片保存到数据库(通过流的形式)

//从数据库取图片显示
         if (dt.Rows[0]["MPicture"].ToString().Trim()!="")
                {
                    System.IO.MemoryStream myStream;
                    System.Drawing.Image myImage;
                    imgdata = (byte[])(dt.Rows[0]["MPicture"]);
                    myStream = new System.IO.MemoryStream();
                    foreach (byte a in imgdata)
                    {
                        myStream.WriteByte(a);
                    }
                    if (imgdata.Length > 0)
                    {
                        myImage = System.Drawing.Image.FromStream(myStream);
                        pic.Image = myImage;//pic:pictureBox
                    }
                }

//将图片保存到数据库
        byte[] imgdata = null;
         if (pic.Image != null)
                {
                    MemoryStream ms = new MemoryStream();
                    //pic.Image.Save(ms, ImageFormat.Png);

                    //Stream impStream;
                    pic.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);

                    imgdata = ms.ToArray();
                    if (picpath != "" || imgdata != null)
                    {
                        scm.Parameters.Add(_db.GetParameter("@MPicture", imgdata));
                    }
                }