Best way to remove multiple items matching a predicate from a c# Dictionary?

Question

I need to remove multiple items from a Dictionary. A simple way to do that is as follows :

  List keystoremove= new List();
  for         


        

Answer 1

Instead of removing, just do the inverse. Create a new dictionary from the old one containing only the elements you are interested in.

public Dictionary NewDictionaryFiltered
(
  Dictionary source,
  Func filter
)
{
return source
  .Where(x => filter(x.Key, x.Value))
  .ToDictionary(x => x.Key, x => x.Value);
}