c# - 避免在 EF 中包含重复

Question

我有两种方法具有相同的包含部分（这些方法仅用于描述问题）

    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);
    }

这三个包括如何使通用以避免代码重复。

Answer 1

开发一个方法，如：

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：我对 executeQuery 方法一无所知，但我认为我的代码会起作用，只是为了确保之后使用实体框架分析器或 SQL 分析器来确保一切正常

祝你好运