How to set a number of decimals in string.Join? [closed]

Question

Console.WriteLine($"{name} -> {string.Join(" ", b[name]):F2} (avg: {b[name].Average():F2})");

I am not exactly sure how to use :F2 in string.Join, since it isn't working. Can you tell me how exactly to use it?

Answer 1

Assuming that bs indexer returns some collection of numbers - you need to provide correct format before joining numbers into string. You can use ToString overload that accepts the number format: string.Join(" ", b[name].Select(n => n.ToString("F2"))) resulting in something like this:

Console.WriteLine($"{name} -> {string.Join(" ", b[name].Select(n => n.ToString("F2")))} (avg: {b[name].Average():F2})");