using System.IO;
using System.IO.Compression;
using System.Web;
using System.Web.Mvc;
public class CompressAttribute : ActionFilterAttribute
{
public override void OnResultExecuted(ResultExecutedContext filterContext)
{
//如果出現錯誤，則不進行壓縮，否則頁面會出現亂碼，而不是報錯的黃頁
if (filterContext.Exception != null)
return;
HttpResponseBase Response = filterContext.HttpContext.Response as HttpResponseBase;
//判斷IIS或者其他承載設備是是否啟用了GZip或DeflateStream
if (Response.Filter is GZipStream || Response.Filter is DeflateStream)
return;
//開始進入壓縮環節
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");
}
}
}
}