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.

"I just want to _merge_ them" - does that mean that you have to take care of duplicates? Or does a simple concatenation suffice? See http://msdn.microsoft.com/en-us/library/bb302894.aspx — VolkerK, Aug 18 '09 at 13:20
I was not concerned with duplicates. However I've gone down the path of Union<> which is similar but provides for other design features; there is a shared task system. Thanks. — DavidA, Aug 18 '09 at 13:30

score 10 · Answer 1 · answered Jun 23 '13 at 21:20

10

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));

answered Jun 23 '13 at 21:20

Samo

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score 5 · Answer 2 · edited May 23 '17 at 11:47

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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.

edited May 23 '17 at 11:47

Community

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answered Jul 02 '10 at 03:42

Matt DeKrey

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score 1 · Answer 3 · answered Aug 18 '09 at 13:31

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

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

answered Aug 18 '09 at 13:31

DavidA

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Merging Two ObservableCollections

3 Answers3