Strange behaviour of Console.ReadKey() with multithreading

Question

I\'m getting a weird problem when using Console.ReadKey() in a multithreaded program.

My question is: Why is this happening? Is it a bug, or is it becau

Answer 1

It is confirmed internal bug in .NET 4.5. It has been reported for example here: https://connect.microsoft.com/VisualStudio/feedback/details/778650/undocumented-locking-behaviour-in-system-console

This worked in .NET 3.5 and .NET 4.

More info: http://blogs.microsoft.co.il/blogs/dorony/archive/2012/09/12/console-readkey-net-4-5-changes-may-deadlock-your-system.aspx

You can use simple workaround to init internal structures and avoid blocking. Just add this to the beggining (from @renestein):

Console.Error.WriteLine(); 
Console.WriteLine();