1     public static class ImageCompress
 2     {
 3         /// <summary>
 4         /// 图片压缩
 5         </summary>
 6         <param name="imagePath">图片文件路径</param>
 7         <param name="targetFolder">保存文件夹 8         <param name="quality">压缩质量 9         <param name="fileSuffix">压缩后的文件名后缀（防止直接覆盖原文件）10         void CompressionImage(string imagePath,string targetFolder,1)">long quality = 100,1)">string fileSuffix = "compress")
11         {
12             if (!File.Exists(imagePath))
13             {
14                 throw new FileNotFoundException();
15             }
16             Directory.Exists(targetFolder))
17 18                 Directory.CreateDirectory(targetFolder);
19 20             var fileInfo =  FileInfo(imagePath);
21             var fileName = fileInfo.Name.Replace(fileInfo.Extension,"");
22             var fileFullName = Path.Combine(${targetFolder}",${fileName}_{fileSuffix}{fileInfo.Extension}23 
24             var imageByte = CompressionImage(imagePath,quality);
25             var ms =  MemoryStream(imageByte);
26             var image = Image.FromStream(ms);
27             image.Save(fileFullName);
28             ms.Close();
29             ms.Dispose();
30             image.Dispose();
31         }
32         private byte[] CompressionImage(long quality)
33 34             using (var fileStream =  FileStream(imagePath,FileMode.Open))
35 36                 var img =Image.FromStream(fileStream))
37                 {
38                     var bitmap =  Bitmap(img))
39                     {
40                         var codecInfo = GetEncoder(img.RawFormat);
41                         var myEncoder = Encoder.Quality;
42                         var myEncoderParameters = new EncoderParameters(143                         var myEncoderParameter =  EncoderParameter(myEncoder,1)">44                         myEncoderParameters.Param[0] = myEncoderParameter;
45                          MemoryStream())
46                         {
47                             bitmap.Save(ms,codecInfo,myEncoderParameters);
48                             myEncoderParameters.Dispose();
49                             myEncoderParameter.Dispose();
50                             return ms.ToArray();
51                         }
52                     }
53                 }
54 55 56 
57         static ImageCodecInfo GetEncoder(ImageFormat format)
58 59             var codecs = ImageCodecInfo.GetImageDecoders();
60             return codecs.FirstOrDefault(codec => codec.FormatID == format.Guid);
61 62     }

        void Button_Click(object sender,RoutedEventArgs e)
        {
            var fileDialog =  OpenFileDialog();
            var fileSelect = ;
            if (fileDialog.ShowDialog(this)==true)
            {
                fileSelect = fileDialog.FileName;
            }
            if(string.IsNullOrWhiteSpace(fileSelect)) ;
            
            ImageCompress.CompressionImage(fileSelect,@"d:\50);

        }