SQL “not in” syntax for Entity Framework 4.1

Question

I have a simple issue with Entity Framework syntax for the \"not in\" SQL equivalent. Essentially, I want to convert the following SQL syntax into Entity Framework syntax:<

Answer 1

Give this a go...

public static List GetLists(List listIDs)
{
    using (dbInstance db = new dbInstance())
    {
        // Use this one to return List where IS NOT IN the provided listIDs
        return db.Lists.Where(x => !listIDs.Contains(x.ID)).ToList();

        // Or use this one to return List where IS IN the provided listIDs
        return db.Lists.Where(x => listIDs.Contains(x.ID)).ToList();
    }
}

These will turn into approximately the following database queries:

SELECT [Extent1].*
FROM [dbo].[List] AS [Extent1]
WHERE  NOT ([Extent1].[ID] IN ())

or

SELECT [Extent1].*
FROM [dbo].[List] AS [Extent1]
WHERE  [Extent1].[ID] IN ()

respectively.