字符串是值类型还是引用类型? [英] Is string a value type or a reference type?

问题描述

字符串是值类型还是引用类型?

Is string a value type or a reference type?

我只是找不到对此的好的"解释...

I just can't find a "good" explanation for this...

推荐答案

Console.WriteLine(typeof(string).IsClass); // true

这是一个引用类型.

它不能是值类型，因为值类型需要已知堆栈大小等.作为引用类型，引用的大小是预先知道的，即使如果字符串的大小不是.

It can't be a value-type, as value-types need a known size for the stack etc. As a reference-type, the size of the reference is known in advance, even if the size of the string isn't.

它行为就像您期望值类型的行为一样，因为它是不可变的；即它一旦创建就不会*改变.但是还有很多其他不可变的引用类型.例如，委托实例.

It behaves like you expect a value-type to behave because it is immutable; i.e. it doesn't* change once created. But there are lots of other immutable reference-types. Delegate instances, for example.

*=除了在 StringBuilder 内部，但在执行此操作时您永远不会看到它...

*=except for inside StringBuilder, but you never see it while it is doing this...

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