using System;

using System.Globalization;

​

public class Program

{

     public static void Main()

     {

         CultureInfo.CurrentUICulture = new MyCultureInfo("");

         int foo = 3;

         Console.WriteLine($"{foo} {foo.ToString()}");

     }

}

​

public class MyCultureInfo : CultureInfo

{

    public MyCultureInfo(string name) : base(name) { }

    public override object GetFormat(Type formatType)

    {

        Console.WriteLine("GETTING FORMAT");

        if (formatType == typeof(ICustomFormatter))

            return new MyCustomFormatter();

        return base.GetFormat(formatType);

    }

}

​

public class MyCustomFormatter : ICustomFormatter

{

    public string Format(string format, object arg, IFormatProvider formatProvider)

    {

        return "YAY";

    }

}

​

public class Request {

   public int PageSize {get;set;}

   public int PageIndex {get;set;}

   // other stuff

   public override string ToString() => $"PageSize={PageSize}, PageIndex={PageIndex}, ...";

}