public static class ImageCompress{/// <summary>/// 圖片壓縮/// </summary>/// <param name="imagePath">圖片文件路徑</param>/// <param name="targetFolder">保存文件夾</param>/// <param name="quality">壓縮質量</param>/// <param name="fileSuffix">壓縮后的文件名后綴（防止直接覆蓋原文件）</param>public static void CompressionImage(string imagePath, string targetFolder, long quality = 100, string fileSuffix = "compress"){if (!File.Exists(imagePath)){throw new FileNotFoundException();}if (!Directory.Exists(targetFolder)){Directory.CreateDirectory(targetFolder);}var fileInfo = new FileInfo(imagePath);var fileName = fileInfo.Name.Replace(fileInfo.Extension, "");var fileFullName = Path.Combine($"{targetFolder}", $"{fileName}_{fileSuffix}{fileInfo.Extension}");var imageByte = CompressionImage(imagePath, quality);var ms = new MemoryStream(imageByte);var image = Image.FromStream(ms);image.Save(fileFullName);ms.Close();ms.Dispose();image.Dispose();}private static byte[] CompressionImage(string imagePath, long quality){using (var fileStream = new FileStream(imagePath, FileMode.Open)){using (var img =Image.FromStream(fileStream)){using (var bitmap = new Bitmap(img)){var codecInfo = GetEncoder(img.RawFormat);var myEncoder = Encoder.Quality;var myEncoderParameters = new EncoderParameters(1);var myEncoderParameter = new EncoderParameter(myEncoder, quality);myEncoderParameters.Param[0] = myEncoderParameter;using (var ms = new MemoryStream()){bitmap.Save(ms, codecInfo, myEncoderParameters);myEncoderParameters.Dispose();myEncoderParameter.Dispose();return ms.ToArray();}}}}}private static ImageCodecInfo GetEncoder(ImageFormat format){var codecs = ImageCodecInfo.GetImageDecoders();return codecs.FirstOrDefault(codec => codec.FormatID == format.Guid);}}

調用方法（WPF為例）

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

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總結

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