Get keys from IList<IDictionary<string, object>>

Question

I have

IList<IDictionary<string, object>> 

How get without duplication keys from all of dictionaries inside this IList and put them to IList<string> using LINQ?

Answer 1

Use SelectMany and Distinct

List<string> uniquekeys = listOfDictionaries
    .SelectMany(d => d.Keys)
    .Distinct()
    .ToList();