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Using Linq to group by object type

Posted on 2011-03-01
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Last Modified: 2012-05-11
I have a list of objects that derive from a common base class i.e. List<BaseObject>. Contained within this list are subclasses ObjectA, ObjectB, ObjectC. There can be many instances of these sub classes contained in List<BaseObject> i.e. ObjectA has 4 instances, ObjectB has 3 instances, and ObjectC has 5 instances. I have the following question, is there a way either using linq or some other method to group each sub  class instance into separate lists for example List<ObjectA>, List<ObjectB> and List<ObjectC> and then execute a common method called getIDs(). This execution ideally would need to happen in parallel.
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Question by:Khopkins32
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käµfm³d   👽 earned 500 total points
ID: 35017597
I think this is what you're after, mind you it is only an example--don't get caught up on the classes I chose  : )

I'm not sure what you're after with the "then execute a common method called getIDs()" part, though.
List<Exception> list = new List<Exception>()
{
    new InvalidOperationException(),
    new InvalidProgramException(),
    new InvalidTimeZoneException(),
    new InvalidOperationException(),
    new InvalidProgramException(),
    new InvalidTimeZoneException(),
    new InvalidOperationException(),
    new InvalidProgramException(),
    new InvalidTimeZoneException(),
    new InvalidProgramException(),
    new InvalidTimeZoneException(),
    new InvalidTimeZoneException(),
};

var grouped = from each in list
              group each by each.GetType() into g
              select g.ToList();

List<List<Exception>> categorized = new List<List<Exception>>();

foreach (var group in grouped)
{
    categorized.Add(group);
}

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