How do I sum values from two dictionaries in C#?

Question

I have two dictionaries with the same structure:

Dictionary foo = new Dictionary() 
{
    {\"Table\", 5 },
    {\"Chair         


        

Answer 1

The following isn't the most efficient solution (because it simply treats both dictionaries as enumerables), but it will work and it is quite clear:

Dictionary result = (from e in foo.Concat(bar)
              group e by e.Key into g
              select new { Name = g.Key, Count = g.Sum(kvp => kvp.Value) })
              .ToDictionary(item => item.Name, item => item.Count);