C#压缩图片

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;
using System.Drawing.Imaging;

namspace CompressImg {
        static void Main(string[] args)
        {
            CompressPic("F://Temp//1.jpg");
            Console.Read();
        }


        public static void CompressPic(string path)
        {
            FileStream file = new FileStream(path, FileMode.Open);
            var img = CompressionImage(file, 40L);
            //var files = CreateImageFromBytes(AppDomain.CurrentDomain.BaseDirectory + @"\" + Guid.NewGuid().ToString(), img);
            //父级目录
            Directory.SetCurrentDirectory(Directory.GetParent(path).FullName);
            string parentPath = Directory.GetCurrentDirectory();
            //时间戳
            TimeSpan ts = DateTime.Now - new DateTime(1970, 1, 1, 0, 0, 0, 0);
            string strTimeStamp = Convert.ToInt64(ts.TotalSeconds).ToString();
            var files = CreateImageFromBytes(parentPath + @"\" + strTimeStamp, img);
            Console.WriteLine(files);
            Console.Read();
        }

        /// <summary>
        /// Convert Byte[] to Image
        /// </summary>
        /// <param name="buffer"></param>
        /// <returns></returns>
        public static Image BytesToImage(byte[] buffer)
        {
            MemoryStream ms = new MemoryStream(buffer);
            Image image = System.Drawing.Image.FromStream(ms);
            return image;
        }

        /// <summary>
        /// 生成压缩后的新图片
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="buffer"></param>
        /// <returns></returns>
        public static string CreateImageFromBytes(string fileName, byte[] buffer)
        {
            string file = fileName;
            Image image = BytesToImage(buffer);
            ImageFormat format = image.RawFormat;
            if (format.Equals(ImageFormat.Jpeg))
            {
                file += ".jpeg";
            }
            else if (format.Equals(ImageFormat.Png))
            {
                file += ".png";
            }
            else if (format.Equals(ImageFormat.Bmp))
            {
                file += ".bmp";
            }
            else if (format.Equals(ImageFormat.Gif))
            {
                file += ".gif";
            }
            else if (format.Equals(ImageFormat.Icon))
            {
                file += ".icon";
            }
            System.IO.FileInfo info = new System.IO.FileInfo(file);
            System.IO.Directory.CreateDirectory(info.Directory.FullName);
            File.WriteAllBytes(file, buffer);
            return file;
        }
        /// <summary>
        /// 压缩图片 </summary>
        /// <param name="fileStream">文件流</param>
        /// <param name="quality">压缩质量 1 - 100 数字越大质量越高</param>
        /// <returns></returns>
        public static byte[] CompressionImage(Stream fileStream, long quality)
        {
            using (System.Drawing.Image img = System.Drawing.Image.FromStream(fileStream))
            {
                using (Bitmap bitmap = new Bitmap(img))
                {
                    ImageCodecInfo CodecInfo = GetEncoder(img.RawFormat);
                    System.Drawing.Imaging.Encoder myEncoder = System.Drawing.Imaging.Encoder.Quality;
                    EncoderParameters myEncoderParameters = new EncoderParameters(1);
                    EncoderParameter myEncoderParameter = new EncoderParameter(myEncoder, quality);
                    myEncoderParameters.Param[0] = myEncoderParameter;
                    using (MemoryStream ms = new MemoryStream())
                    {
                        bitmap.Save(ms, CodecInfo, myEncoderParameters);
                        myEncoderParameters.Dispose();
                        return ms.ToArray();
                    }
                }
            }
        }

        private static ImageCodecInfo GetEncoder(ImageFormat format)
        {
            ImageCodecInfo[] codecs = ImageCodecInfo.GetImageDecoders();
            foreach (ImageCodecInfo codec in codecs)
            {
                if (codec.FormatID == format.Guid)
                { return codec; }
            }
            return null;
        }
}