当返回IOrderedEnumerable？ [英] When to return IOrderedEnumerable?

问题描述

应该 IOrderedEnumerable 作为回报纯粹键入语义价值？

Should IOrderedEnumerable be used as a return type purely for semantic value?

例如，消费在presentation层的模型时，我们怎么能知道收集是否需要订购或已订购了？

For example, when consuming a model in the presentation layer, how can we know whether the collection requires ordering or is already ordered?

怎么样在一个仓库包装与顺序存储过程通过条款的情况。如若库返回 IOrderedEnumerable ？怎么会是这样实现的？

What about in the case that a repository wraps a stored procedure with an ORDER BY clause. Should the repository return IOrderedEnumerable? And how would that be achieved?

推荐答案

我不认为这会是一个不错的主意：

I don't think it would be a good idea:

如果IOrderedEnumerable被用作返回类型为纯粹的语义价值？

Should IOrderedEnumerable be used as a return type purely for semantic value?

例如，消费在presentation层的模型时，我们怎么能知道收集是否需要订购或已订购了？

For example, when consuming a model in the presentation layer, how can we know whether the collection requires ordering or is already ordered?

什么在明知序列是有序的，如果你不知道被哪个键是有序的点？在 IOrderedEnumerable 接口的一点是要能够添加辅助排序标准，这没有多大意义，如果你不知道什么是主要标准。

What is the point in knowing that a sequence is ordered if you don't know by which key it is ordered? The point of the IOrderedEnumerable interface is to be able to add a secondary sort criteria, which doesn't make much sense if you don't know what is the primary criteria.

怎么样在一个仓库包装与ORDER BY子句的存储过程的情况。如果存储库返回IOrderedEnumerable？怎么会是这样实现的？

What about in the case that a repository wraps a stored procedure with an ORDER BY clause. Should the repository return IOrderedEnumerable? And how would that be achieved?

这是没有意义的。正如我已经说过， IOrderedEnumerable 用于添加辅助排序标准，但是当数据被存储过程返回，它已经排序，为时已晚添加第二排序标准。所有你能做的就是重新梳理它完全，因此调用 ThenBy 的结果不会有预期的效果。

This doesn't make sense. As I already said, IOrderedEnumerable is used to add a secondary sort criteria, but when the data is returned by the stored procedure, it is already sorted and it's too late to add a secondary sort criteria. All you can do is re-sort it completely, so calling ThenBy on the result wouldn't have the expected effect.

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