1     using System.IO;
 2     using System.IO.Compression;
 3     using System.Web;
 4     using System.Web.Mvc;
 5 
 6     public class CompressAttribute : ActionFilterAttribute
 7     {
 8         public override void OnResultExecuted(ResultExecutedContext filterContext)
 9         {
10             //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
11             if (filterContext.Exception != null)
12                 return;
13 
14             HttpResponseBase Response = filterContext.HttpContext.Response as HttpResponseBase;
15 
16             //判断IIS或者其他承载设备是是否启用了GZip或DeflateStream
17             if (Response.Filter is GZipStream || Response.Filter is DeflateStream)
18                 return;
19 
20             //开始进入压缩环节
21             string AcceptEncoding = filterContext.HttpContext.Request.Headers["Accept-Encoding"];
22             if (!string.IsNullOrEmpty(AcceptEncoding) && (AcceptEncoding.Contains("gzip") || AcceptEncoding.Contains("deflate")))
23             {
24                 if (AcceptEncoding.Contains("gzip"))
25                 {
26                     Response.Filter = new GZipStream(Response.Filter, CompressionMode.Compress);
27                     Response.Headers.Remove("Content-Encoding");
28                     Response.AppendHeader("Content-Encoding", "gzip");
29                 }
30                 else
31                 {
32                     Response.Filter = new DeflateStream(Response.Filter, CompressionMode.Compress);
33                     Response.Headers.Remove("Content-Encoding");
34                     Response.AppendHeader("Content-Encoding", "deflate");
35                 }
36             }
37         }
38     }