C# base64图片数据流转图片

private void button1_Click(object sender, EventArgs e)
       {
           try
           {
               var base64 = this.richTextBox1.Text;
               base64 = base64.Replace("data:image/png;base64,", "").Replace("data:image/jgp;base64,", "").Replace("data:image/gif;base64,", "").Replace("data:image/jpg;base64,", "").Replace("data:image/jpeg;base64,", "");//将base64头部信息替换
               byte[] bytes = Convert.FromBase64String(base64);
               MemoryStream memStream = new MemoryStream(bytes);
               Image mImage = Image.FromStream(memStream);
               Bitmap bp = new Bitmap(mImage);
               MemoryStream ms = new MemoryStream();
               string pathA = AppDomain.CurrentDomain.BaseDirectory + "PdfRecord\\";
               if (!System.IO.Directory.Exists(pathA))
               { System.IO.Directory.CreateDirectory(pathA); }
               string path = pathA + DateTime.Now.ToString("yyyyMMdd") + ".jpg";
               bp.Save(path, System.Drawing.Imaging.ImageFormat.Jpeg);//注意保存路径 
               string pathpdf = pathA + DateTime.Now.ToString("yyyyMMdd") + ".pdf";
             
           }
           catch (Exception)
           {
 
               throw;
           }
       }