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Don’t understand nullable reference types

PPlayboi17

10/19/2022

PPlayboi17

10/19/2022

Documentation says that non-nullable reference types “must be initialized to a non-null value” and “compiler issues a warning when code assigns maybe-null” Yet in the picture which is from a dotnet entity framework video, they just set firstname and lastname, non-nullable reference types, to null How? It says you can’t initialize to null value

TThinker

10/19/2022

null! essentially forces the compiler to shut up about nullability warning. You can set non-nullable reference types to null just fine, it's just the compiler which will warn you about it. But if you say "shut up" to the compiler then it won't complain

PPlayboi17

10/19/2022

Thank you. I dont see why you would want to lose the warnings? If you don’t want the warnings and can still set it to null, why not use a nullable reference type? So the “?” only affects compiler warnings and doesn’t affect the behavior of the variable?

TThinker

10/19/2022

For reference types, yes Sometimes you have a situation (like with EF) where you don't have an initial value to set anything to, but you know for certain that the value won't be null when you actually access it. EF will set those values for you before you can properly access them

PPlayboi17

10/19/2022

Answered before I could ask, are you saying it has a default constructor? If you don’t initialize firstname for example, will it just make it white space?

TThinker

10/19/2022

Strings are by default null All reference types are by default null

PPlayboi17

10/19/2022

But you said “EF will set those values for you before you can properly access them”. I’m talking in that scenario.

TThinker

10/19/2022

I mean that when you access a model, EF with have initialized it already

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