表格列出哪些F＃类型是值类型以及哪些是引用类型的参考

Is there a good reference that tabulates which F# types are value types and which are reference types? Alternatively, is there a good way to query a type to determine which it is? Yes, I know that things that are classes are reference types and things that are structs are value types. At the same time, this distinction isn't always intuitive to me with F# types. For example, tuple types are reference types. Evidently, so are record types.

是否有一个很好的参考，列出哪些F＃类型是值类型，哪些是引用类型？或者，是否有一种查询类型以确定它的好方法？是的，我知道类的东西是引用类型，结构的东西是值类型。同时，对于F＃类型，这种区别并不总是直观的。例如，元组类型是引用类型。显然，记录类型也是如此。

1 个解决方案

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You can always check whether something is a value type using F# Interactive:

您始终可以使用F＃Interactive检查某些内容是否为值类型：

typeof<int * int>.IsValueType

As you mentioned, tuples are reference types and so this returns false.

正如您所提到的，元组是引用类型，因此返回false。

I agree that the difference is not always clear. In general, most types that you work with in F# are reference types (and all F# types that you define with the exception of struct types).

我同意差异并不总是很清楚。通常，您在F＃中使用的大多数类型都是引用类型（以及您定义的所有F＃类型，但结构类型除外）。

Primitive types (numerical and booleans) are value types
原始类型（数字和布尔值）是值类型
But string is a reference type
但字符串是引用类型
There are a couple of struct types defined in .NET like DateTime and TimeSpan and also KeyValuePair (this is sometimes confusing as this is quite similar to tuple).
.NET中定义了几种结构类型，如DateTime和TimeSpan以及KeyValuePair（这有时令人困惑，因为它与元组非常相似）。
F# tuples, records, discriminated unions, lists, arrays are all reference types
F＃元组，记录，区分联合，列表，数组都是引用类型
F# object types are also reference types unless they are marked as Struct.
F＃对象类型也是引用类型，除非它们标记为Struct。

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