public class GzipFilter : ActionFilterAttribute{public override void OnResultExecuting(ResultExecutingContext filterContext){string acceptEncoding = filterContext.HttpContext.Request.Headers["Accept-Encoding"];if (String.IsNullOrEmpty(acceptEncoding)) return;var response = filterContext.HttpContext.Response;acceptEncoding = acceptEncoding.ToUpperInvariant();if (acceptEncoding.Contains("GZIP")){response.AppendHeader("Content-Encoding", "gzip");response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);}else if (acceptEncoding.Contains("DEFLATE")){response.AppendHeader("Content-Encoding", "deflate");response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);}}}

       [GzipFilter]public ActionResult Index()

        protected void Application_BeginRequest(object sender, EventArgs e){GzipFiles();}private void GzipFiles(){string acceptEncoding = Request.Headers["Accept-Encoding"];string filepath = Request.FilePath;string mapfilepath = Server.MapPath("~" + filepath);if (acceptEncoding.Contains("gzip")){#region Gzip处理if (filepath.EndsWith(".css"))//css文件处理
                {Response.AppendHeader("Content-Type", "text/css");Request.ContentType = "text/css";if (filepath.EndsWith("gzip.css")){FileInfo fi = new FileInfo(mapfilepath);Response.AppendHeader("Content-Encoding", "gzip");int len = mapfilepath.Length - "gzip.css".Length;if (fi.Exists == false) GZip(mapfilepath.Substring(0, len), mapfilepath);}}else if (filepath.EndsWith(".js"))//js文件处理
                {Response.AppendHeader("Content-Type", "application/x-javascript");Request.ContentType = "application/x-javascript";if (filepath.EndsWith("gzip.js")){FileInfo fi = new FileInfo(mapfilepath);Response.AppendHeader("Content-Encoding", "gzip");int len = mapfilepath.Length - "gzip.js".Length;if (fi.Exists == false) GZip(mapfilepath.Substring(0, len), mapfilepath);}}#endregion}else if (acceptEncoding.Contains("deflate")){#region deflate处理if (filepath.EndsWith(".css"))//css文件处理
                {Response.AppendHeader("Content-Type", "text/css");Request.ContentType = "text/css";if (filepath.EndsWith("deflate.css")){FileInfo fi = new FileInfo(mapfilepath);Response.AppendHeader("Content-Encoding", "gzip");int len = mapfilepath.Length - "deflate.css".Length;if (fi.Exists == false) GZip(mapfilepath.Substring(0, len), mapfilepath);}}else if (filepath.EndsWith(".js"))//js文件处理
                {Response.AppendHeader("Content-Type", "application/x-javascript");Request.ContentType = "application/x-javascript";if (filepath.EndsWith("deflate.js")){FileInfo fi = new FileInfo(mapfilepath);Response.AppendHeader("Content-Encoding", "gzip");int len = mapfilepath.Length - "deflate.js".Length;if (fi.Exists == false) GZip(mapfilepath.Substring(0, len), mapfilepath);}}#endregion}}public void GZip(string fileName, string gipFileName){FileStream fr = File.Create(gipFileName);FileStream fc = File.OpenRead(fileName);GZipStream gzs = new GZipStream(fr, CompressionMode.Compress); //压缩文件类byte[] arr = new byte[fc.Length];fc.Read(arr, 0, (int)fc.Length);gzs.Write(arr, 0, (int)fc.Length);gzs.Close();fc.Close();fr.Close();}//解压缩文件方法public void DeZGip(string fileName, string gipFileName){//准备输入输出文件FileStream fc = File.Create(fileName);FileStream fr = File.OpenRead(gipFileName);GZipStream gzs = new GZipStream(fr, CompressionMode.Decompress);byte[] arr = new byte[fr.Length];fr.Read(arr, 0, (int)fr.Length);fc.Write(arr, 0, (int)fr.Length);gzs.Close();fr.Close();fc.Close();}