LINQ级联

进行两个序列的串联，是比较相似联合操作在其操作，但这不会删除重复记录。

Concat例子 - Enumerable.Concat(Tsource)方法

C#

using System;
using System.Collections.Generic;
using System.Linq;

namespace Operators
{
  class Concat
  {
     static void Main(string[] args)
     {
        Pet[] cats = GetCats();
        Pet[] dogs = GetDogs();

        IEnumerable<string> query = cats.Select(cat => cat.Name).Concat(dogs.Select(dog => dog.Name));

        foreach (var e in query)
        {
           Console.WriteLine("Name = {0} ", e);
        }

        Console.WriteLine("\nPress any key to continue.");
        Console.ReadKey();
     }

     static Pet[] GetCats()
     {
        Pet[] cats = { new Pet { Name="Barley", Age=8 },
                       new Pet { Name="Boots", Age=4 },
                       new Pet { Name="Whiskers", Age=1 } };
                     return cats;
     }

     static Pet[] GetDogs()
     {
        Pet[] dogs = { new Pet { Name="Bounder", Age=3 },
                       new Pet { Name="Snoopy", Age=14 },
                       new Pet { Name="Fido", Age=9 } };
                     return dogs;
     }
  }

  class Pet
  {
     public string Name { get; set; }
     public int Age { get; set; }
  }
}

VB

Module Module1

  Sub Main()

     Dim cats As List(Of Pet) = GetCats()
     Dim dogs As List(Of Pet) = GetDogs()

     Dim list = cats.Cast(Of Pet)().Concat(dogs.Cast(Of Pet)()).ToList()

     For Each e In list
        Console.WriteLine("Name = {0}", e.Name)
     Next

     Console.WriteLine(vbLf & "Press any key to continue.")
     Console.ReadKey()
  End Sub

  Function GetCats() As List(Of Pet)

     Dim cats As New List(Of Pet)

        cats.Add(New Pet With {.Name = "Barley", .Age = 8})
        cats.Add(New Pet With {.Name = "Boots", .Age = 4})
        cats.Add(New Pet With {.Name = "Whiskers", .Age = 1})

        Return cats
  End Function

  Function GetDogs() As List(Of Pet)

     Dim dogs As New List(Of Pet)

        dogs.Add(New Pet With {.Name = "Bounder", .Age = 3})
        dogs.Add(New Pet With {.Name = "Snoopy", .Age = 14})
        dogs.Add(New Pet With {.Name = "Fido", .Age = 9})

        Return dogs
  End Function

  Class Pet
     Public Property Name As String
     Public Property Age As Integer
  End Class
End Module

当在C＃或VB上面的代码被编译和执行时，它产生了以下结果：

Barley 
Boots 
Whiskers 
Bounder 
Snoopy 
Fido

Press any key to continue.