添加到ICollection [英] Add to an ICollection

问题描述

我当前正在编写一个C#项目，并且需要对该项目进行单元测试.对于我需要进行单元测试的一种方法，我使用了一个ICollection，该ICollection通常是从列表框的选定项中填充的.

I am currently writing a C# project and I need to do unit testing for the project. For one of the methods that I need to unit test I make use of an ICollection which is normally populated from the selected items of a list box.

当我为方法创建单元测试时，它会创建行

When I create a unit test for the method it creates the line

ICollection icollection = null; //Initialise to an appropriate value

如何创建此ICollection的实例和该集合的项目?

How can I create an instance of this ICollection and an item to the collection?

推荐答案

ICollection是一个接口，您不能直接实例化它.您需要实例化一个实现ICollection的类.例如List<T>.另外， ICollection接口没有Add方法-为此，您将需要实现IList或IList<T>的东西.

ICollection is an interface, you can't instantiate it directly. You'll need to instantiate a class that implements ICollection; for example, List<T>. Also, the ICollection interface doesn't have an Add method -- you'll need something that implements IList or IList<T> for that.

示例:

List<object> icollection = new List<object>();
icollection.Add("your item here");

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