will clearing dictionaries do the garbage collector a favor?

问题

When I'm working with a set of non-struct object-object dictionaries (Dictionary<ClassA,ClassB>) will I do the GC a favor when I call Clear() on all of them?

Or more interresting: Could it do any harm to the GC when I do this?

All objects including the dictionaries are expected to be in generation 2 since it's a long running transformation which will also generate a large amount of short and medium lived helper objects.

Update for the comments: The objects itself are mainly loaded by an EntityFramework context (so the dictionary is not the GC root) and the dictionaries are not resused since used in a context class like so:

internal sealed class TransformationContext : IDisposable
{
   private readonly Dictionary<ClassA,ClassB> dict1 = new ...;
   private readonly Dictionary<ClassC,ClassD> dict2 = new ...;
   private readonly Dictionary<ClassE,ClassF> dict3 = new ...;

   public void Dispose() // class is sealed, classic Dispose-pattern not needed
   {
     dict1.Clear();
     dict2.Clear();
     dict3.Clear();
   }
}

using(var context = new TransformationContext(some, input, values))
  [...]

来源：https://stackoverflow.com/questions/32819098/will-clearing-dictionaries-do-the-garbage-collector-a-favor