asp.net c# request³£ÓÃ

using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
namespace pub.mo
{
public class request
{
private request() { }
/// <summary>
/// »ñÈ¡session
/// </summary>
/// <param name="_session_name"></param>
/// <returns></returns>
public static string session(string _session_name)
{
object obj = HttpContext.Current.Session[_session_name];
return obj == null ? config.empty : obj.ToString();
}
/// <summary>
/// µÃµ½Request.QueryString
/// </summary>
/// <param name="_str"></param>
/// <returns></returns>
public static string querystring(string _str)
{
string s = HttpContext.Current.Request.QueryString[_str];
return s == null ? config.empty : s;
}
/// <summary>
/// µÃµ½Request.Form
/// </summary>
/// <param name="_str"></param>
/// <returns></returns>
public static string form(string _str)
{
string s = HttpContext.Current.Request.Form[_str];
return s == null ? config.empty : s;
}
/// <summary>
/// µÃµ½Request.Cookies
/// </summary>
/// <param name="_str"></param>
/// <returns></returns>
public static string cookies(string _str)
{
HttpCookie hc = HttpContext.Current.Request.Cookies[_str];
return hc == null ? config.empty : hc.Value;
}
/// <summary>
/// »ñµÃµ±Ç°Ò³ÃæµÄÃû³Æ
/// </summary>
/// <returns>µ±Ç°Ò³ÃæµÄÃû³Æ</returns>
public static string page_name()
{
string[] urlArr = HttpContext.Current.Request.U