1 public static ImageCodecInfo GetEncoder(ImageFormat format)
 2 {
 3     ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
 4     foreach (ImageCodecInfo codec in codecs)
 5     {
 6         if (codec.FormatID == format.Guid)
 7             return codec;
 8     }
 9     return null;
10 }
 
11 Bitmap im = 這裡是原圖片
12 //轉成jpg
13 var eps = new EncoderParameters(1);
14 var ep = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 85L);
15 eps.Param[0] = ep;
16 var jpsEncodeer = GetEncoder(ImageFormat.Jpeg);
17 //儲存圖片
18 imgurl = @"/Content/Upload/" + guid + extension;
19 im.Save(path + imgurl,jpsEncodeer,eps);
 
20 //釋放資源
21 im.Dispose();
22 ep.Dispose();
23 eps.Dispose();