如何创建实现IDictionary<'K，'V>的类型.和IEnumerable<'V> [英] How to create a type that implement IDictionary<'K, 'V> and IEnumerable<'V>

问题描述

我想创建一个实现IDictionary <'K，'V>和IEnumerable <'V>的只读键集合.采用明显的方法，我得到以下错误:

I want to create a read-only keyed collection that implements IDictionary<'K, 'V> and IEnumerable<'V>. Taking the obvious approach I get the following error:

此类型在不同的通用实例"IEnumerable<'V>"上实现或继承相同的接口和"IEnumerable< KeyValuePair<'K，'V>".在此版本的F#中不允许这样做.

有其他方法可以实现这一目标吗?

Is there a different way of achieving this?

编辑-由于这似乎是F#的不可逾越的局限性，实现此目标的惯用方式是什么?想到的一个想法是提供返回数据所需视图的成员，例如，成员x.List:IList <'V>和成员x.Dict:IDictionary <'K，'V>.对象表达式可用于提供实现.还有其他想法吗?

EDIT - Since this seems to be an insurmountable limitation of F#, what would be an idiomatic way of achieving this? One thought that comes to mind is providing members that return the desired view of the data, e.g., member x.List : IList<'V> and member x.Dict : IDictionary<'K, 'V>. Object expressions could be used to provide the implementations. Any other ideas?

推荐答案

恐怕不是.CLR允许实现多个接口(当然，甚至是相同的基本类型)，但不能实现F#语言.我相信，如果您使用C#编写类，不会有任何问题，但是F#在当前版本中会给您带来问题.

I'm afraid not. The CLR allows implementation of multiple interfaces of course (even of the same base type), but not the F# language. I believe you won't have any problems if you write the class in C#, but F# is going to give you problems in the current version.

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