图片和流的相互转化 （c/s）

//图片转化为流保存；

 Stream ms;
                byte[] picbyte;
                OpenFileDialog open = new OpenFileDialog();

                open.Filter = "图片文件(*.jpg)|*.jpg|图片文件(*.png)|*.png|图片文件(*.bmp)|*.bmp|图片文件(*.jpeg)|*.jpeg";

                open.RestoreDirectory = true;

                if (open.ShowDialog() == DialogResult.OK)
                {
                    if ((ms = open.OpenFile()) != null)
                    {
                        picbyte = new byte[ms.Length];
                        ms.Position = 0;
                        ms.Read(picbyte, 0, Convert.ToInt32(ms.Length));
                        // 图片
                        model_BD010.BD010_008 = picbyte;
                        ms.Close();
                    }
                }
                string path = open.FileName;
                txtUserImg.Text = path;
                // 显示预览图片
                picUser.Image = Image.FromFile(path);

//流转化为图片

picPhoto.Image = Image.FromStream(new MemoryStream((byte[])str));