为拓展方法传递lambda表达式

Posted 2021-01-18 myblogou

 1     class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             
 6             string[] names = { "Burke", "Connor", "Frank", "Everett", "Albert", "George", "Harris", "David" };
 7 
 8 
 9             //为扩展方法传Lambda 做参数，lambda表达式会被转化成匿名方法，匿名方法会转化成委托。注意，我们这里的扩展方法要求的参数是委托类型的实例
10             IEnumerable<string> myQuery =
11                 names.Where(s => s.Length == 5)
12                 .OrderBy(s => s)
13                 .Select(s => s.ToLower());
14 
15 
16             foreach (string item in myQuery)
17             {
18                 Console.WriteLine(item);
19             }
20 
21         }
22 
23     }