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I was able to reproduce this issue on Ubuntu 14.04 with mono 4.0.5. Also, this issue may expand to more string methods than EndsWith, it's just the one I encountered.
I ran the following program:
public class Program
public static void Main(string args)
var val = "something" + '\0';
With Mono this outputs "True". With CoreCLR on Linux and on windows (including net45 on win) this outputs "False".
Seems like an inconsistency in the implementations.
Confirmed with master/a7fb596. I'll take a look, thanks for the report!
*** This bug has been marked as a duplicate of bug 10443 ***