public Dictionary <TKey, T> ToDictionary <TKey>(Func <T, TKey> keySelector)
 {
     return(ProjectableMethods.ToDictionary <T, TKey>(query, keySelector));
 }
 public Dictionary <TKey, TElement> ToDictionary <TKey, TElement>(Func <T, TKey> keySelector, Func <T, TElement> elementSelector)
 {
     return(ProjectableMethods.ToDictionary <T, TKey, TElement>(query, keySelector, elementSelector));
 }