C# 返回图片的字节流byte[]

            /// 
  
            /// 返回图片的字节流byte[]  
            /// 
  
            ///   
            ///   
            ///   
            public static byte[] getImageByte(string imagePath, WebClient webClient)  
            {  
                byte[] imgByte = null;  
                try  
                {  
                    //MessageBox.Show("getImageByte");  
                    //Stopwatch stopwatch = new Stopwatch();  
                    //stopwatch.Start();  
                    //DateTime dateStart = DateTime.Now;  
      
                    if (PubFunc.UrlDiscern(imagePath))  
                    {  
                        Bitmap bt = new Bitmap(webClient.OpenRead(imagePath));  
                        imgByte = PubFunc.ImgToByte(bt);  
                    }  
                    else  
                    {  
                        using (FileStream files = new FileStream(imagePath, FileMode.Open))  
                        {  
                            imgByte = new byte[files.Length];  
                            files.Read(imgByte, 0, imgByte.Length);  
                            files.Close();  
                        }  
                    }  
                    //stopwatch.Stop();  
                    //MessageBox.Show((DateTime.Now - dateStart).TotalMilliseconds.ToString());  
      
                }  
                catch (Exception ee)  
                {  
                    MessageBox.Show(ee.ToString());  
                }  
                return imgByte;  
            }




          /// 
  
          /// 图片转换成字节流  
          /// 
  
          /// 要转换的Image对象  
          /// 转换后返回的字节流  
          public static byte[] ImgToByte(Image img)  
          {  
              try  
              {  
                  using (MemoryStream ms = new MemoryStream())  
                  {  
                      byte[] imagedata = null;  
                      img.Save(ms, System.Drawing.Imaging.ImageFormat.Jpeg);  
                      imagedata = ms.GetBuffer();  
                      return imagedata;  
                  }  
              }  
              catch (Exception ee)  
              {  
                  MessageBox.Show(ee.ToString());  
                  return null;  
              }  
          }