How to call an extension method of a dynamic type?

Question

I\'m reading the book \'C# in Depth, 2nd Edition\' of Jon Skeet. He said that we can call extension methods with dynamic arguments using two workarounds, just as

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Answer 1

Like this:

dynamic numbers = Enumerable.Range(10, 10);
var firstFive = Enumerable.Take(numbers, 5);

In other words, just call it as a static method instead of as an extension method.

Or if you know an appropriate type argument you could just cast it, which I'd typically do with an extra variable:

dynamic numbers = Enumerable.Range(10, 10);
var sequence = (IEnumerable) numbers;
var firstFive = sequence.Take(5);

... but if you're dealing with dynamic types, you may well not know the sequence element type, in which case the first version lets the "execution time compiler" figure it out, basically.