Question

我有两个方法，包括相同的部分（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);
    }

这三个包括如何共同避免代码重复。

Answer 1

开发类似的方法：

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：我对executeQuery方法一无所知，但我认为我的代码可以正常运行，确保在使用Entity Framework Profiler或SQL profiler之后确保一切正常

祝你好运

避免在EF中包含重复内容

1 个答案: