Nullable Func<T, TResult>

Question

In C# is it possible to pass a method a nullable Func?

Neither Func<A, bool>? nor Func?<A, bool> is working.

Answer 1

That doesn't make sense.
All reference types, including Func<...>, can already be null.

Nullable types apply to value types (structs), which cannot ordinarily be null.

Answer 2

A Func is a delegate which is a reference type. This means it is already nullable (you can pass null to a method).