Merging Two ObservableCollections

Question

I have two Observable Collections that I need to merge into one collection.

This arises because I have two methods, getTasks(staffID) which returns an ObservableCollection and getTasks(teamID) which selects the staff and pulls back the staff tasks.

For the teams I will have multiple small observableCollections, I just want to merge them.

Solution 1

This is what worked for me:

Concat or Union, but the result is a IEnumerable, so it needs to be converted back into an ObservableCollection:

var result = new ObservableCollection<T>(list1.Concat(list2));

Solution 2

I found a reference to CompositeCollection on another SO article: Merged ObservableCollection

Since you're looking to do a Concat/Union, this seems to do exactly that. Too bad it's not strongly typed.

Solution 3

I went with volkerK's suggestion and then moved to:

http://msdn.microsoft.com/en-us/library/system.linq.enumerable.union.aspx Ta