When I try to call Length method it does not exist on ‘Tuple’ instanse

    Tuple<int, string> tuple = Tuple.Create(1, "1");
    var l = tuple.Length;

And i receive default error like this “Error CS1061 ‘Tuple<int, string, int, int, char>’ does not contain a definition for ‘Length’ and no accessible extension method ‘Length’ accepting a first argument of type ‘Tuple<int, string, int, int, char>’ could be found (are you missing a using directive or an assembly reference?)”

But Tuple implement interface ITuple from System.Runtime.CompilerServices that contains Lenth method

In addition if I do explicit cast to ITuple method exist

      Tuple<int, string> tuple = Tuple.Create(1, "1");
      var l = ((ITuple)tuple).Length;