How to identify a nullable reference type for generic type?

Question

In C# 8 with nullable enabled, is there a way to identify a nullable reference type for generic type?

For nullable value type, ther

Answer 1

You can't use nullable in the constraint, but you can use it in the method signature. This effectively constraints it to be a nullable type. Example:

static Result> Create(Nullable value) where T  : struct
{
    //Do something
}

Note that you can use this side by side with your existing method, as an overload, which allows you to execute a different logic path if it's nullable versus if it is not.

static Result> Create(Nullable value) where T  : struct
{
    Log("It's nullable!");
    Foo(value);
}

public static Result Create(T value)
{
    Log("It's not nullable!");
    Foo(value);
}