避免在EF中包含重復項

Question

我有兩個包含相同部分的方法（這些方法僅用於描述問題）

    public Car GetCarByChildEntityId(long id)
    {
        var query = DataContext.AsQueryableFor<RTraining>()
            .Where(rb => rb.Id == id)
            .Include(rb => rb.Car.CarStatus)
            .Include(rb => rb.Car.item.Customer)
            .Include(rb => rb.Car.item.MyItem.Wheel.Customer);

        return executeQuery(query).SingleOrDefault().Car;

    }


    public IEnumerable<IEntity> GetEntities()
    {
        var query = DataContext.AsQueryableFor<RTraining>()
            .Include(rb => rb.Car.CarStatus)
            .Include(rb => rb.Car.Item.Customer)
            .Include(rb => rb.Car.Item.MyItem.Wheel.Customer);

        return executeQuery(query);
    }

這三個包括如何才能通用以避免代碼重復。

Answer 1

開發類似的方法：

private IQueryable<Car> getCommonQuery()
{
            DataContext.AsQueryableFor<RTraining>()
            .Include(rb => rb.Car.CarStatus)
            .Include(rb => rb.Car.Item.Customer)
            .Include(rb => rb.Car.Item.MyItem.Wheel.Customer);
}

public Car GetCarByChildEntityId(long id)
{
     return executeQuery(getCommonQuery()).SingleOrDefault(rb => rb.Id == id).Car;
}

public IEnumerable<IEntity> GetEntities()
{
     return executeQuery(getCommonQuery()).OfType<IEntity>();
}

注意：我對executeQuery方法一無所知，但是我認為我的代碼可以正常工作，請確保在使用Entity Framework探查器或SQL探查器之后一切正常

祝好運