generic NOT constraint where T : !IEnumerable

Question

As per the title, is it possible to declare type-negating constraints in c# 4 ?

Answer 1

I found my self trying to implement the same case mentioned in the comments:

void doIt(IEnumerable what) { }
void doIt(T whats) { }

I excepted the following code to reference the first method:

doIt(new List());

But it actually references the second one.

One solution is to cast the argument like this:

doIt(new List().AsEnumerable());

The cast could be hidden by another overload:

void doIt(List whats) {
    doIt(whats.AsEnumerable());
}