LINQ中Aggregate的用法

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 using System.Threading.Tasks;
 6 
 7 namespace LinqDemo
 8 {
 9     class Program
10     {
11         static void Main(string[] args)
12         {
13             List<TypeEnum> lstTypeEnum = new List<TypeEnum>() { TypeEnum.A,TypeEnum.B,TypeEnum.C };
14 
15             var lstType = lstTypeEnum.Aggregate(new List<int>(),
16                 (total,next) => 
17                 { 
18                     total.Add(((int)next)); 
19                     return total; 
20                 }
21             );
22 
23             Console.WriteLine(string.Join(",", lstType.ToArray()));//输出1,2,3
24             Console.ReadKey();
25         }
26     }
27     public enum TypeEnum
28     {
29         A = 1,B = 2,C=3
30     }
31 }