Add to an ICollection

2020-06-08 03:37发布

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.

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

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

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

5条回答
叛逆
2楼-- · 2020-06-08 03:41
List<Object> list = new List<Object>();
list.Add(object1);
list.Add(object2);
// etc...

ICollection collection = list;
// further processing of collection here.

Contrary to some comments, IList<T> does implement ICollection, at least as far as I can tell.

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爷、活的狠高调
3楼-- · 2020-06-08 03:47

I believe you need to inherit the ICollection interface into a new class before you can use it.

How to implement ICollection

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4楼-- · 2020-06-08 03:49

Let's say you will have a collection of strings, then the code will be:

ICollection<string> test = new Collection<string>();
test.Add("New Value");
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▲ chillily
5楼-- · 2020-06-08 03:53

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.

Example:

List<object> icollection = new List<object>();
icollection.Add("your item here");
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We Are One
6楼-- · 2020-06-08 03:57

What you can do is create a type that implements ICollection and from there make use of it in your testing. A List or Collection would work for creating an instance of the object. I guess another question would be what type are the items of the list box. Adding items to the List or Collection is pretty trivial just using the .Add(...) method.

List<T> list = new List<T>();
list.Add(item_from_your_list_box);
list.Add(item2_from_your_list_box);

Is there something more specific you need to be doing with this collection?

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