Add elements from IList to ObservableCollection

Question

I have an ObservableCollection, and I'd like to set the content of an IList to this one. Now I could just create a new instance of the collection..:

public ObservableCollection<Bar> obs = new ObservableCollection<Bar>();  public void Foo(IList<Bar> list) {     obs = new ObservableCollection<Bar>(list);  } 

But how can I actually take the content of the IList and add it to my existing ObservableCollection? Do I have to loop over all elements, or is there a better way?

public void Foo(IList<Bar> list) {    foreach (var elm in list)        obs.Add(elm);  } 

Answer 1

You could do

public void Foo(IList<Bar> list) {     list.ToList().ForEach(obs.Add); } 

or as an extension method,

    public static void AddRange<T>(this ObservableCollection<T> collection, IEnumerable<T> items)     {         items.ToList().ForEach(collection.Add);     }     

Answer 2

You could write your own extension method if you are using C#3+ to help you with that. This code has had some basic testing to ensure that it works:

public static void AddRange<T>(this ObservableCollection<T> coll, IEnumerable<T> items) {     foreach (var item in items)     {         coll.Add(item);     } }