using System;

public static class Program

{

    public static void Main()

    {

        B x1 = typeof(A).ToEnum1<B>("Default");

        B y1 = typeof(A).ToEnum1<B>("Two");

        Console.WriteLine("Using tenum: {0}, {1}", x1, y1);

        B x2 = typeof(A).ToEnum2<B>("Default");

        B y2 = typeof(A).ToEnum2<B>("Two");

        Console.WriteLine("Using typeof(TEnum): {0}, {1}", x2, y2);

    }

    enum A { Zero = 0, One = 1, Two = 2, Default = One }

    enum B { Zero = 1, One = 2, Two = 4, Default = Two }

    static TEnum ToEnum1<TEnum>(this Type tenum, string str, bool ignoreCase = false) => (TEnum)Enum.Parse(tenum, str, ignoreCase);

    static TEnum ToEnum2<TEnum>(this Type tenum, string str, bool ignoreCase = false) => (TEnum)Enum.Parse(typeof(TEnum), str, ignoreCase);

}