LINQ Group By into a Dictionary Object

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I am trying to use LINQ to create a Dictionary<string, List<CustomObject>> from a List<CustomObject>. I can get this to work using “var”, but I don’t want to use anonymous types. Here is what I have 

var x = (from CustomObject o in ListOfCustomObjects
      group o by o.PropertyName into t
      select t.ToList());

I have also tried using Cast<>() from the LINQ library once I have x, but I get compile problems to the effect of it being an invalid cast.

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