20200225-tostringext-reflection.cs

class Program
{
    static void Main(string[] args)
    {
        var listOfLists = new List<List<string>>() { 
            new List<string>() {"one", "two"},
            new List<string>() {"three", "four"}
        };
        Console.WriteLine(listOfLists.ToStringExt());
        // output: [[one, two], [three, four]]
    }
}