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，我想知道它们是否将完全取代Anonymous Types.我知道ValueTuples是结构，因此其行为与作为类的Anonymous Types有所不同.但是，我看不到用例，在这种情况下，我宁愿使用Anonymous Type而不是ValueTuple.

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.

在C#7.0中是否有使用Anonymous Type优于使用ValueTuples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，元组不是.这反映在以下事实上:匿名类型公开属性，元组公开字段.数据绑定几乎总是需要属性.

Anonymous types are immutable, tuples are not. This is reflected in the fact that anonymous types expose properties, tuples 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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