C#（一） Linq表达式

筛选分数大于80，升序排列

  List scores = new List { 5, 200, 0, 66, 4, 32, 700, 1 };         IEnumerable highScoresQuery =               from score in scores               where score > 80               orderby score ascending                  select score; //ascending  升序排列 //descending 降序排列 

或直接筛选不排序

var result = scores.Where(c => c>80).ToList();

Join 参考https://mp.weixin.qq.com/s/Bf_cHt7Yl1yBudbQKOhdTg

let 参考https://mp.weixin.qq.com/s/AUwbq7gWGZa9K4W0SGhEfA