[nullable-analysis] Make a non-nullable parameter, field, or property do not need to be initialized.

[CodingOctocat]

I have a property which is non-nullable and normally I have to initialize it on exit from the constructor and I want to remove this warning.

Since this property is in the ViewModel, it's available through Messenger, so it can't actually be uninitialized when it's actually called.

public class ViewModel : IRecipient<PropertyChangedMessage<Foo?>>
{
    public Foo MyFoo { get; set; }    

    public void Receive(PropertyChangedMessage<Foo?> message)
    {
        if (message.NewValue is null)
        {
            MyFoo = new Foo();
        }
        else
        {
            MyFoo = message.NewValue;
        }
    }
}

How can this warning be removed without introducing new attribute?

[svick]

Probably the easiest approach is to assign a default value of null! to the property:

public Foo MyFoo { get; set; } = null!;

[KennethHoff]

You should also take a look here. Specifically [MemberNotNull].

I realize after typing this that this is not really applicable, but it's good to know regardless!