generic NOT constraint where T : !IEnumerable

Question

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

Answer 1

As far as I know it is not possible to do that.

What you can do is some runtime checking:

public bool MyGenericMethod()
{
    // if (T is IEnumerable) // don't do this

    if (typeof(T).GetInterface("IEnumerable") == null)
        return false;

    // ...

    return true;
}