C# 返回图片的字节流byte[]
#region 返回图片的字节流byte[] /// <summary> /// 返回图片的字节流byte[] /// </summary> /// <param name="imagePath"></param> /// <param name="webClient"></param> /// <returns></returns> 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; } #endregion #region 图片转换成字节流 /// <summary> /// 图片转换成字节流 /// </summary> /// <param name="img">要转换的Image对象</param> /// <returns>转换后返回的字节流</returns> 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; } } #endregion