Which sorting algorithm is used by .NET's Array.Sort() method?

Question

It uses the QuickSort algorithm.

Is it true?

Answer 1

The code is open.

https://github.com/microsoft/referencesource/blob/master/mscorlib/system/array.cs

Answer 2

As discussed in the docs for this method it depends on what version you're talking about. .NET Framework versions prior to 4.5 used quick sort. Starting with .NET 4.5 it uses introspective sorting. Refer to the docs for links on the algorithms.