如何在c#中获取父url referrer

using System;
using System.Web;

namespace ReferrerExample
{
    class Program
    {
        static void Main(string[] args)
        {
            // 获取当前请求
            HttpRequest request = HttpContext.Current.Request;

            // 检查是否存在引用URL
            if (request.UrlReferrer != null)
            {
                // 获取引用URL的字符串表示
                string referrerUrl = request.UrlReferrer.ToString();
                Console.WriteLine("Referrer URL: " + referrerUrl);
            }
            else
            {
                Console.WriteLine("No referrer URL found.");
            }
        }
    }
}