Union two ObservableCollection Lists

Question

I have two ObservableCollection lists, that i want to unite. My naive approach was to use the Union - Method:

ObservableCollection unitedPoints = ob         


        

Answer 1

The LINQ Union extension method returns an IEnumerable. You will need to enumerate and add each item to the result collection:-

var unitedPoints = new ObservableCollection ();
foreach (var p in observableCollection1.Union(observableCollection2))
   unitedPoints.Add(p);

If you'd like a ToObservableCollection then you can do:

public static class MyEnumerable
{
    public static ObservableCollection ToObservableCollection(this IEnumerable source)
    {
        var result = new ObservableCollection ();
        foreach (var item in source)
           result.Add(item);
        return result;
    }
 }

Now your line is:

var unitedPoints = observableCollection1.Union(observableCollection2).ToObservableCollection();