MVC 开启gzip压缩

     using System.IO;
     using System.IO.Compression;
     using System.Web;
     using System.Web.Mvc;

     public class CompressAttribute : ActionFilterAttribute
     {
         public override void OnResultExecuted(ResultExecutedContext filterContext)
         {
             //如果出现错误，则不进行压缩，否则页面会出现乱码，而不是报错的黄页
             if (filterContext.Exception != null)
                 return;

             HttpResponseBase Response = filterContext.HttpContext.Response as HttpResponseBase;

             //判断IIS或者其他承载设备是是否启用了GZip或DeflateStream
             if (Response.Filter is GZipStream || Response.Filter is DeflateStream)
                 return;

             //开始进入压缩环节
             string AcceptEncoding = filterContext.HttpContext.Request.Headers["Accept-Encoding"];
             if (!string.IsNullOrEmpty(AcceptEncoding) && (AcceptEncoding.Contains("gzip") || AcceptEncoding.Contains("deflate")))
             {
                 if (AcceptEncoding.Contains("gzip"))
                 {
                     Response.Filter = new GZipStream(Response.Filter, CompressionMode.Compress);
                     Response.Headers.Remove("Content-Encoding");
                     Response.AppendHeader("Content-Encoding", "gzip");
                 }
                 else
                 {
                     Response.Filter = new DeflateStream(Response.Filter, CompressionMode.Compress);
                     Response.Headers.Remove("Content-Encoding");
                     Response.AppendHeader("Content-Encoding", "deflate");
                 }
             }
         }
     }