Grouping collections of the same type C#

I have a collection of differents objects and I want to know if I can create collections grouping the same type of objects. I don't know if there is a method with linq or something like that.

List<Object> list = new List<Object>();
Object1 obj1 =  new Object1();
Object2 obj2 =  new Object2();
Object1 obj3 =  new Object1();
Object3 obj4 =  new Object3();
Object3 obj5 =  new Object3();

list.Add(obj1);
list.Add(obj2);
list.Add(obj3);
list.Add(obj4);
list.Add(obj5);

I want new lists of the same type:

List<Object1> newList1 = method.GetAllObjectsFromListObject1 // Count = 2
List<Object2> newList2 = //GetAllObjectsFromListObject2 // Count = 1
List<Object3> newList3 = //GetAllObjectsFromListObject3 // Count = 2
Jon Skeet
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LINQ can do this very easily returning a single lookup collection:

var lookup = list.ToLookup(x => x.GetType());

You can then:

  • Iterate over it to find all the types and the associated objects
  • Fetch all the items of a specific type using the indexer. If you specify a type which isn't present in the lookup, this will return an empty sequence (which is really useful, rather than throwing an exception or returning null).

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