Linq多集合连接

class Program
  {
      static void Main(string[] args)
      {
          List<Test1> list1 = new List<Test1>();
          List<Test2> list2 = new List<Test2>();
          List<Test3> list3 = new List<Test3>();
 
          list1.Add(new Test1()
          {
               Age1 = 30,
                Name = "30Name"
          });
          list1.Add(new Test1()
          {
              Age1 = 40,
              Name = "30Name"
          });
 
          list2.Add(new Test2()
          {
              Age2 = 30,
              Name = "30Name2"
          });
          list2.Add(new Test2()
          {
              Age2 = 40,
              Name = "30Name2"
          });
 
          list3.Add(new Test3()
          {
              Age3 = 30,
              Name = "30Name3"
          });
          list3.Add(new Test3()
          {
              Age3 = 40,
              Name = "30Name3"
          });
 
          var end = (from a in list1
                     join b in list2 on a.Age1 equals b.Age2
                     join cc in list3 on a.Age1 equals cc.Age3
                     select new Test3()
                     {
                         Age3 = a.Age1,
                         Name1 = a.Name,
                         Name2 = b.Name,
                         Name3 = cc.Name,
 
                     }).ToList();
          Console.WriteLine( 0 );
      }
  }<br><br><br><br>

public class Test1
{
public int Age1 { get; set; }
public string Name { get; set; }
}
public class Test2
{
public int Age2 { get; set; }
public string Name { get; set; }
}
public class Test3
{
public int Age3 { get; set; }
public string Name { get; set; }

public string Name1 { get; set; }
public string Name2 { get; set; }
public string Name3 { get; set; }
}