Convert List<int> to a Dictionary<int,int> using LINQ

Question

Say I have the following list:

  List<int> list = new List<int>() { 5, 5, 6, 6, 6, 7, 7, 7, 7 };

How could I convert the list to a Dictionary where the value is the count of each distinct number in the list by using LINQ? For example, the above list should be converted to a dictionary with the elements:

key -> value

5 -> 2

6 -> 3

7 -> 4

Answer 1

var result = list.GroupBy(i => i).ToDictionary(g => g.Key, g => g.Count());