How can I do a [MemberNotNull] for an Entity Framework IncludeAll() method I wrote?

Question

I have the following helper method. This includes all complex properties in my Event DbSet (actually there's 9 properties but I reduced it for clarity):

public static IQueryable<Event> IncludeAll(this IQueryable<Event> source)
{
    return source
        .Include(e => e.Description)
        .Include(e => e.Tags)
        .Include(e => e.Thumbnail);
}

I use it as follows:

_event = await dbContext.Events
    .IncludeAll()
    .FirstOrDefaultAsync(e => e.Id == pkEvent);

When I do this, I get warnings in that call that it may need Description, Tags, & Thumbnail. And in the first use of each, again warnings that they may be null.

Is there a way to do something like the following:

[MemberNotNull(nameof(Picture))]
public static IQueryable<Event> IncludeAll(this IQueryable<Event> source)

That (declaring MemberNotNull) does not work.

Answer 1

follow this thread:

https://github.com/dotnet/efcore/issues/17212