结构可以包含引用类型的字段 [英] Can structs contain fields of reference types

问题描述

灿结构包含引用类型的字段？如果他们可以，这是一个不好的做法？

Can structs contain fields of reference types? And if they can is this a bad practice?

推荐答案

是的，他们可以。这是个好主意吗？嗯，这取决于具体情况。我个人很少在第一时间创建自己的结构......我会像对待任何新的用户定义的结构有一定程度的怀疑。我并不是说，它的的总是的错误的选项，只是它需要一个多类明确的说法。

Yes, they can. Is it a good idea? Well, that depends on the situation. Personally I rarely create my own structs in the first place... I would treat any new user-defined struct with a certain degree of scepticism. I'm not suggesting that it's always the wrong option, just that it needs more of a clear argument than a class.

这将是一个糟糕的主意，一个结构有一个可变对象，虽然引用......否则，你可以拥有它的两个值看的独立，但都没有：

It would be a bad idea for a struct to have a reference to a mutable object though... otherwise you can have two values which look independent but aren't:

MyValueType foo = ...;
MyValueType bar = foo; // Value type, hence copy...

foo.List.Add("x");
// Eek, bar's list has now changed too!

可变结构是邪恶的。与以可变类型的引用不可变的结构是不同的方式悄悄的罪恶。

Mutable structs are evil. Immutable structs with references to mutable types are sneakily evil in different ways.

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