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As per the title, is it possible to declare type-negating constraints in c# 4 ?
The use-case of interest was to allow the following overloads to co-exist
void doIt<T>(T what){}
void doIt<T>(IEnumerable<T> whats){}
At the moment there is ambiguity because T in the first method could be an IEnumerable<> (so I would like to specify that T should NOT be IEnumerable)
No – there’s no such concept either in C# or in the CLR.