Boardy
Boardy

Reputation: 36205

Add to an ICollection

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?

Upvotes: 26

Views: 95473

Answers (5)

Altair
Altair

Reputation: 294

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.

Upvotes: 5

ShelbyZ
ShelbyZ

Reputation: 1504

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?

Upvotes: 0

Neil Knight
Neil Knight

Reputation: 48537

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

How to implement ICollection

Upvotes: 0

Donut
Donut

Reputation: 112815

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");

Upvotes: 38

Fischermaen
Fischermaen

Reputation: 12458

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");

Upvotes: 4

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