1   class Program
 2     {
 3         public class post
 4         {
 5             public int id { get; set; }
 6             public string name { get; set; }
 7             public int age { get; set; }
 8             public string pd { get; set; }
 9         }
10         public class get
11         {
 
12             public int id { get; set; }
13 
14             public string  source { get; set; }
15         }
16 
17         static void Main(string[] args)
18         {
19        
20 
21             var pro = new List<post>
22           {
23                 new post { id = 1,name="123",age=1,pd="
 
sad"},
24                 new post { id = 2,name="124",age=11,pd="sad"},
25                 new post { id =4,name="125",age=111,pd="sad"},
26                 new post {id = 5, name="126",age=1111,pd="sad"},
27           };
28             var prd = new List<get>
29           {
30                 new
 
 get { id =1,source="123"},
31                 new get { id = 4,source="124s"},
32                 new get {id = 3, source="124d5"},
33                 new get {id = 6, source="12f6"},
34           };
35 
36             var uds = pro.Join(prd, u => u.id, d => d.id, (u, d) => new { id = u.id, name = u.name, age = u.age, source = d.source }).ToList();
37             //uds = [{ id = 1, name = "123", age = 1, source = "123" },{ id = 4, name = "125", age = 111, source = "124s" }];
38 
39             pro.ForEach(o => { o.pd = null; if (o.pd == null) o.pd = "sd"; });//批量處理
40 
41             int pageIndex = 1, pageSize=10; //分頁
42             pro.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToList();
43 
44              
45             Console.Read();
46 
47         }
48 
49     }