C#•3y ago

❔ How to make a generic class property nullable?

I'm trying to have a generic interface with a nullable property:

public interface IMayHaveCreator<TKey>
{
    TKey? CreatorId { get; set; }
}

public interface IMayHaveCreator<TKey>
{
    TKey? CreatorId { get; set; }
}

public interface IMayHaveCreator<TKey>
{
    TKey? CreatorId { get; set; }
}

public interface IMayHaveCreator<TKey>
{
    TKey? CreatorId { get; set; }
}

But this doesn't work, as when I add it to a class, it gives an error when I try to make the implementation nullable aswell:

public class Foo : IMayHaveCreator<Guid>
{
    public Guid? CreatorId { get; set; }
}

public class Foo : IMayHaveCreator<Guid>
{
    public Guid? CreatorId { get; set; }
}

public class Foo : IMayHaveCreator<Guid>
{
    public Guid? CreatorId { get; set; }
}

public class Foo : IMayHaveCreator<Guid>
{
    public Guid? CreatorId { get; set; }
}

I says that

Foo

Foo

Foo

Foo doesn't implement

CreatorId

CreatorId

CreatorId

CreatorId, and it only works when I have it as

Guid CreatorId

Guid CreatorId

Guid CreatorId

Guid CreatorId

Any idea why this doesn't work? is it even possible to this is C#?