using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace VRS
{
    public class QueryStringModule : IHttpModule
    {
        public void Init(HttpApplication context)
        {
            context.BeginRequest += Context_BeginRequest;
        }

        private void Context_BeginRequest(object sender, EventArgs e)
        {
            HttpApplication application = (HttpApplication)sender;
            HttpContext context = application.Context;
            HttpRequest request = context.Request;
            HttpResponse response = context.Response;

            // 假设我们要处理的querystring参数名为"id"
            string compress = request.QueryString["compress"];

            if (!string.IsNullOrEmpty(compress))
            {
                // 这里可以添加处理id的逻辑
                // ...

                // 如果需要重定向到一个新的URL，可以这样做
                // response.Redirect("newurl?param=" + id);

                // 如果需要修改querystring参数，可以这样做
                // context.RewritePath("page.aspx?param=" + id);

               if ( !Int32.TryParse(compress,out int temp))
                {
                    // var strURL = request.RawUrl + "&compress=" +"1";
                    var strURL = request.RawUrl.Replace("compress="+ compress, "compress=1");
                    response.Redirect(strURL);
                }
            }
        }

        public void Dispose()
        {
            // 清理代码，如果有必要的话
        }
    }
}