Stream/Bytes[]/Image对象相互转化

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/// <summary> /// 将 Stream 转成 byte[] /// </summary> /// <param name="stream"></param> /// <returns></returns> public static byte[] StreamToBytes(Stream stream) {     byte[] bytes = new byte[stream.Length];     stream.Read(bytes, 0, bytes.Length);     // 设置当前流的位置为流的开始     stream.Seek(0, SeekOrigin.Begin);     return bytes; }       /// <summary> /// 将 byte[] 转成 Stream /// </summary> /// <param name="bytes"></param> /// <returns></returns> public static Stream BytesToStream(byte[] bytes) {     Stream stream = new MemoryStream(bytes);     return stream; }       // <summary> /// 字节流转换成图片 /// </summary> /// <param name="byt">要转换的字节流</param> /// <returns>转换得到的Image对象</returns> public static Image BytToImg(byte[] byt) {     try     {         MemoryStream ms = new MemoryStream(byt);         Image img = Image.FromStream(ms);         return img;     }     catch (Exception ex)     {         LogHelper.WriteError("StreamHelper.BytToImg 异常", ex);         return null;     } }       /// <summary> ///  图片转换成字节流 /// </summary> /// <param name="img"></param> /// <returns></returns> public static byte[] ImageToByteArray(Image img) {     ImageConverter imgconv = new ImageConverter();     byte[] b = (byte[])imgconv.ConvertTo(img, typeof(byte[]));     return b; }       /// <summary> /// 把图片Url转化成Image对象 /// </summary> /// <param name="imageUrl"></param> /// <returns></returns> public static Image Url2Img(string imageUrl) {     try     {         if (string.IsNullOrEmpty(imageUrl))         {             return null;         }           WebRequest webreq = WebRequest.Create(imageUrl);         WebResponse webres = webreq.GetResponse();         Stream stream = webres.GetResponseStream();         Image image;         image = Image.FromStream(stream);         stream.Close();           return image;     }     catch (Exception ex)     {         LogHelper.WriteError("StreamHelper.Url2Img 异常", ex);     }       return null; }       /// <summary> /// 把本地图片路径转成Image对象 /// </summary> /// <param name="imagePath"></param> /// <returns></returns> public static Image ImagePath2Img(string imagePath) {     try     {         if (string.IsNullOrEmpty(imagePath))         {             return null;         }           byte[] bytes = Image2ByteWithPath(imagePath);         Image image = BytToImg(bytes);         return image;     }     catch (Exception ex)     {         LogHelper.WriteError("StreamHelper.ImagePath2Img 异常", ex);         return null;     } }