using System;

public class Test
{
  private static bool TryParseOf<TType>(string s, out TType result)
  {
    if (typeof(TType) == typeof(int))
    {
      var parseSuccessful = int.TryParse(s, out int innerResult);
      result = (TType)(object)innerResult;
      return parseSuccessful;
    }

    throw new NotImplementedException();
  }

  public static void Main()
  {
    Console.WriteLine("{0}: {1}", TryParseOf1<int>("123", out var x), x);
  }
}