public void Setup()
{
var content = Enumerable.Range(0, N).Select(i => new KeyValuePair <string, int>(i.ToString(), i));
dictionary = new Dictionary <string, int>(content);
immutableDictionary = ImmutableDictionary.CreateBuilder <string, int>();
immutableTrieDictionary = ImmutableTrieDictionary.CreateBuilder <string, int>();
immutableDictionary.AddRange(content);
immutableTrieDictionary.AddRange(content);
}