f#泛型类型比较

Question

我试图弄清楚从通话中返回的obj是否属于某种类型.这是我的代码:

type MyType<'T>= 
    val mutable myArr : array
    val mutable id : int
    val mutable value : 'T

并且在某些方法中,MyType在范围内......

let a  = someFunThatReturnsObj()   // a could be of type MyType 

如何确定a是否为MyType类型？

Answer 1

match a with
| :? MyType<int> as mt -> // it's a MyType<int>, use 'mt'
| _ -> // it's not

如果你只关心MyType<X>一些未知的X,那么

let t = a.GetType()
if t.IsGenericType && t.GetGenericTypeDefinition() = typedefof<MyType<int>> then
    // it is