asp.net core 解析Url地址中的QueryString

using System;
using System.Collections.Specialized;
using System.Web;

namespace ExcelTest3
{
    class Program
    {
        static void Main(string[] args)
        {
            var collection= QueryCollection();
            var wx = collection["wx_fmt"];
            var wx1 = collection.GetValues("wx_fmt")[0];
            Console.WriteLine("Hello World!");
        }

        public static NameValueCollection QueryCollection()
        {
            var str2 = "https://mmbiz.qpic.cn/mmbiz_jpg/sa2b5Z6x6OCoKQqBB3SAwcyJgN9CTREkiaa885U4QJLs2QwbOHicFzJE7J0zWndWC5ibk6tWCdpJjloL7iab5TGVLg/0?wx_fmt=jpeg";
            var uir = new Uri(str2);
            var sss = uir.Query;
            var collection = HttpUtility.ParseQueryString(sss);
            return collection;
           
        }
    }
}