score:15
Accepted answer
To sum your inner dictionary just do:
DictSum = pt.Select(x => x.UnitsSoldByYear.Values.Sum()).Sum()
or equally:
DictSum = pt.Sum(x => x.UnitsSoldByYear.Values.Sum())
EDIT:
according to the OP comment, this creates a dictionary with the sum by each key:
DictSum = pt.SelectMany(kvp => kvp.UnitsSoldByYear)
.GroupBy(kvp => kvp.Key)
.ToDictionary(grp => grp.Key,grp => grp.Sum(kvp => kvp.Value))
Source: stackoverflow.com
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