列表数组重复计数

Question

我有一个包含以下结果的数组

red 
red
red
blue
blue
Green
White
Grey

我希望获得数组的每个值的重复计数,例如:

red    Count=3
blue   Count=2
Green  Count=1
White  Count=1
Grey   Count=1

Answer 1

LINQ让这很简单:

Dictionary<string, int> counts = array.GroupBy(x => x)
                                      .ToDictionary(g => g.Key,
                                                    g => g.Count());