F#返回ICollection | 返回ICollection

本文介绍了F#返回ICollection的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在使用C#创建的库.我一直在努力将一些代码移植到F#，但必须使用C#库中的许多基础类型.

I'm working with a library created in C#. I've been working on porting some code to F# but must use quite a few underlying types from the C# lib.

一段代码需要计算一个值列表，并将其分配给该类中的公共字段/属性.该字段是一个包含两个ICollection的C#类.

One piece of code needs to calculate a list of values and assign it to a public field/property in the class. The field is a C# class that contains two ICollection.

我的F#代码工作正常，需要返回一个F#Seq/List.

My F# code works fine and needs to return an F# Seq/List.

我尝试了以下每个都会产生错误的代码段.

I tried the following code snippets which each produce errors.

F#成员的返回类型是具有恢复列表类型的称为recoveryList的类型
类中的公共字段，它是一个类本身包含两个ICollection对象

Return type of F# member is a type called recoveryList with type Recoveries list
Public field in class that is a class itself containing two ICollection objects



The fix is easy though -- all you need to do is add an explicit upcast to ICollection to your ResizeArray<'T> or System.Collections.Generic.List<'T> before assigning it:
// Make sure to add an 'open' declaration for System.Collections.Generic
this.field.Collection1 = (recoveries :> ICollection)
或
this.field.Collection1 = (ResizeArray<Recoveries>() :> ICollection)
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