C# 7.0 ValueTuples 与匿名类型 [英] C# 7.0 ValueTuples vs Anonymous Types

问题描述

看看新的 C# 7.0 ValueTuples，我想知道它们是否会完全取代 Anonymous Types.我知道 ValueTuples 是结构，因此其行为与作为类的 Anonymous Types 有点不同.但是，我没有看到使用 Anonymous Type 而不是 ValueTuple 的用例.

Looking at the new C# 7.0 ValueTuples, I am wondering if they will completely replace Anonymous Types. I understand that ValueTuples are structs and therefore behave a bit differently than Anonymous Types which are classes. I don't see a use-case, however, in which I would prefer using an Anonymous Type over a ValueTuple.

是否存在使用 匿名类型 仍然比在 C# 7.0 中使用 ValueTuples 有益的用例?

Are there any use-cases where using an Anonymous Type would still be beneficial over using ValueTuples in C# 7.0?

推荐答案

匿名类型是不可变的，ValueTuple 不是.这反映在匿名类型公开属性，ValueTuple 公开字段的事实中.数据绑定几乎总是需要属性.

Anonymous types are immutable, ValueTuples are not. This is reflected in the fact that anonymous types expose properties, ValueTuples expose fields. Data binding almost always requires properties.

大量现有代码仅适用于引用类型，不适用于值类型.特别想到的是 Entity Framework 中的预测:对值类型的预测根本没有实现.

Plenty of existing code only works with reference types, not with value types. What in particular comes to mind are projections in Entity Framework: projections to value types are simply not implemented.

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