使用'flexible'类型参数针对通用类型进行模式匹配 [英] Pattern matching against generic type using 'flexible' type parameter

问题描述

match value with
| :? list<#SomeType> as l -> l //Is it possible to match any list of a type derived from SomeType?
| _ -> failwith "doesn't match"

推荐答案

不，不幸的是，不可能做这样的事情-CLR没有提供进行这种类型测试的任何有效方法.参见如何投射对象到F#和

No, it's unfortunately not possible to do something like this - the CLR doesn't provide any efficient way of doing that kind of type test. See How to cast an object to a list of generic type in F# and F# and pattern matching on generics in a non-generic method implementing an interface for a few (rather ugly) solutions.

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