如何通过ASP.NET Core解析URL中的查询字符串？

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csharpusing System;using System.Collections.Specialized;

namespace ExcelTest3{ class Program { static void Main(string[] args) { var collection=new QueryCollection(); var wx=collection[wx_fmt]; var wx1=collection[wx_fmt]; } }}

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 = "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;

}
}
}