The foreach identifier and closures

Question

In the two following snippets, is the first one safe or must you do the second one?

By safe I mean is each thread guaranteed to call the method on the Foo from the s

Answer 1

In your case, you can avoid the problem without using the copying trick by mapping your ListOfFoo to a sequence of threads:

var threads = ListOfFoo.Select(foo => new Thread(() => foo.DoSomething()));
foreach (var t in threads)
{
    t.Start();
}