如果使用Entity Framework不是零，则查询值

Question

使用EF，我想查询整数，但如果值为0，我不想进行查询。

rentalContext.Apartments
    .Include(a => a.ApartmentType)
    .Include(a => a.Files)
    .Include(a => a.Address)
    .Where(a => some other search conditions &&
        (filters.CityId != 0 && a.Address.CityObject.Id == filters.CityId))
    .ToList()
    .OrderByDescending(a => a.Created);

如果CityId不是0，它可以正常工作，但如果它为零，则返回列表中的0个对象。这不是你应该这样做的方式吗？

Answer 1

现在只有当filters.CityId == 0为假时才会检查第二个条件。

rentalContext.Apartments
    .Include(a => a.ApartmentType)
    .Include(a => a.Files)
    .Include(a => a.Address)
    .Where(a => some other search conditions &&
         (filters.CityId == 0 || a.Address.CityObject.Id == filters.CityId))
    .OrderByDescending(a => a.Created)
    .ToList();