using System;

using System.Web;

using System.Linq;

using System.Text.Json;

using Microsoft.AspNetCore.WebUtilities;

using Microsoft.AspNetCore.Http;

using Microsoft.AspNetCore.Http.Features;

​

public class Program

{

    public static void Main()

    {

        var sampleQueryString = "?param=foo,escape%2Ctest"; //"?param=foo&param=escape%2Ctest";

​

        // https://github.com/dotnet/aspnetcore/blob/v6.0.2/src/Http/Http/test/Internal/DefaultHttpRequestTests.cs#L139

        var request = new DefaultHttpContext().Request;

        var requestFeature = request.HttpContext.Features.Get<IHttpRequestFeature>();

        requestFeature.QueryString = sampleQueryString;

​

        var a = request.Query["param"].ToList();

​

        var b = HttpUtility.ParseQueryString(sampleQueryString)["param"];

​

        var c = QueryHelpers.ParseQuery(sampleQueryString)["param"].ToList();

​

        Console.WriteLine(JsonSerializer.Serialize(a));

        Console.WriteLine(JsonSerializer.Serialize(b));

        Console.WriteLine(JsonSerializer.Serialize(c));

​

    }

}