使用可能为空的列表使用EF6查询

Question

I have a function that takes 3 string[] , and then using EF6 queries my database to try to find a match. The lists can have nothing, one, or many variables in them.

using (var db= new Db(ConnectionString))
{
    var results =
                await
                    db.dbases.Where(
                                w =>
                                    portfolioSelected.Any(a => a == w.portfolio) &&
                                    statusSelected.Any(a => a == w.statusname) &&
                                    deskSelected.Any(a => a == w.assignedto)
                                ).ToListAsync();
}

When attempting this query, I get zero results back.

How can I write this so that the 3 lists can have any composition, including being empty, and I get the results I desire?

Answer 1

Per Jeroen Heiers comment, I was able to break up the query by checking if the string[] was null, and creating my query in parts.

        using (var db = new Db(ConnectionString))
        {
            IQueryable<dbase> query = cmax.dbases.Where(w => w != null);
            var results = new List<dbase>();

                    if (portfolioSelected != null)
                        query = query.Where(w => portfolioSelected.Any(a => a == w.portfolio));
                    if (statusSelected != null)
                        query = query.Where(w => statusSelected.Any(a => a == w.statusname));
                    if (deskSelected != null)
                        query = query.Where(w => deskSelected.Any(a => a == w.assignedto)); break;


            results = await query.ToListAsync();
        }