Question

我有List<string> _words喜欢

"Car", "Car", "Car", "Bird", "Sky", "Sky"

我希望按每个单词计数降序对其进行排序，以便最终List<string>为

"Car",
"Sky",
"Bird

我如何在LINQ中执行此操作？我真的不需要每个单词的计数

SQL中的

将是：

select word, count(1) as count1
from word
group by word
order by count1 desc, word

答案

另一种变体：

    var _output = from p in _words
                  group p by p into g
                  orderby g.Count() descending, g.Key ascending 
                  select g.Key;

Answer 1

您需要使用GroupBy和OrderByDescending的组合：

string[] words = {"Car", "Car", "Car", "Bird", "Sky", "Sky"};
var output = words
    .GroupBy(word => word)
    .OrderByDescending(group => group.Count())   
    .Select(group => group.Key);

Answer 2

您可以使用GroupBy()然后OrderByDescending()按照从最常见的次数开始的次数排序：

var result = _words.GroupBy(x => x)
                   .OrderByDescending(x => x.Count())
                   .Select(x => x.Key)
                   .ToList();

Linq组字符串数组按计数和排序

答案

2 个答案: