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   源码介绍

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不改变图片尺寸对图片进行压缩，亲测10M的图片压缩成了1M左右，图片还没有失真，真可谓无损压缩，棒棒哒

 public frmZIpPhoto()
        {
            InitializeComponent();
        }

        private void btnAdd_Click(object sender, EventArgs e)
        {
            

            openFileDialog1.ShowDialog();
            if (openFileDialog1.FileName != "")
            {
                txtPhotoF.Text = openFileDialog1.FileName;
                txtPhotoZF.Text = openFileDialog1.FileName.Replace(openFileDialog1.SafeFileName, "Z" openFileDialog1.SafeFileName);
            }

        }

        private void btnZip_Click(object sender, EventArgs e)
        {
            try
            {
                File.Copy(txtPhotoF.Text, txtPhotoZF.Text, true);
                Compression(txtPhotoZF.Text, decimal.MaxValue,txtSize.Text);
                MessageBox.Show("操作成功！新的文件名为：Z" openFileDialog1.SafeFileName);
            }
            catch
            {
                MessageBox.Show("操作失败！");

            }

        }
        protected void Compression(string filePath, decimal vfileSize,string  vZipSize)
        {
            FileInfo file = new FileInfo(filePath);
           // decimal fileSize = Math.Round((decimal)file.Length / 512, 1); // KB
            decimal fileSize = Math.Round((decimal)file.Length / 1024, 1); // KB

            if (fileSize > (decimal.Parse(vZipSize)) && vfileSize > fileSize) // Optimazed image shouldn't be more than 60KB
            {
                try
                {
                    System.Drawing.Image originalImage = System.Drawing.Image.FromFile(filePath);
                    Bitmap bitmap = new Bitmap(originalImage);

                    ImageCodecInfo imageCodecInfo = ImageCodecInfo.GetImageEncoders().FirstOrDefault(it => it.MimeType == "image/jpeg");

                    EncoderParameters encoderParameters = new EncoderParameters(1);
                    EncoderParameter encoderParameter = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 30L);
                    encoderParameters.Param[0] = encoderParameter;
                    originalImage.Dispose();

                    bitmap.Save(filePath, imageCodecInfo, encoderParameters); // Override
                    bitmap.Dispose();
                    vfileSize = fileSize;
                    // More than 60KB will compression again
                    Compression(filePath, vfileSize,vZipSize);
                }
                catch (Exception)
                {

                }
                finally
                {
                    file = null;

                }
            }
        }