如何从子列表数据中添加主列表.. [英] How to add in main list from sub list data..

问题描述

我有一个主要清单：



列表< object1> LIST1

object1 有属性： Id ，姓名

和

列表< object2> LIST2

object2 包含属性： Id ，名称



我想从linq尝试将list2数据添加到list1，以获得包含两个数据的一个平面列表。我试着通过蹩脚的方式得到那个但我想要来自linq ...



我尝试过的事情：

  foreach （item  in  list.selectmenu（a = >  a.list2）.toList（））
 {
  //   blalballala  
} 

解决方案

如果 object2 派生自 object1 ，则只能这样做 - 否则你试图将两个不同类型的对象插入相同的清单。

如果相关，你可以很容易地做到这一点：

 class Fruit {} 
 class Apple：Fruit { } 
 class Banana：Fruit {} 
 cla ss SampleClass 
 {
 public static void Main（）
 {
 
 List< Fruit> fruits = new List< Fruit>（）{new Apple（），new Apple（）}; 
 List< Banana> bananas = new List< Banana>（）{new Banana（），new Banana（）}; 
 fruits.AddRange（香蕉）; 
 
} 
} 
 

但是如果没有它们之间的某种关系，你只能将它们组合成一个它们都继承的类的List。 / blockquote>

您可以使用Mapper。 Mapper将一个 Type 映射到另一个 Type ，其中属性名称相同，另一个类型必须具有默认构造函数。一个流行的Mapper是 AutoMapper ，这里使用的是一个自制的版本，但语法类似。

列表< Animal> animals =  new  List< Animal> 
 {
  new  Animal（）{Name =  狗，Legs =  4 }，
  new  Animal（）{Name =   Human，Legs =  2 }，
  new  Animal（）{Name =   Spider，Legs =  8 } 
 
}; 
 List< Animal2> animals2 =  new 列表< Animal2> 
 {
  new  Animal2（）{Name =   Insect，Legs =  6 }，
  new  Animal2（）{Name =   Fish，Legs =  0 } 
 
}; 
  //   source target  
 Mapper< Animal2，Animal> myMapper =  new  Mapper< Animal2，Animal>（）; 
  var  query = animals2.Select（a = >  myMapper.Map（a）） ; 
 animals.AddRange（查询）; 
 

I have one main list:

List<object1> LIST1
object1 have properties: Id, Name
and
List<object2> LIST2
object2 with properties: Id, Name

I wanna try from linq to add from list2 data to list1 to have one flat list with both data...I try by lame way to get that but i want from linq...

What I have tried:

foreach (item in list.selectmenu(a => a.list2).toList())
{
//blalballala
}

解决方案

You can only do that if object2 is derived from object1 - otherwise you are trying to insert two different type objects into the same list.
You can do it quite easily if they are related:

class Fruit { }
class Apple : Fruit { }
class Banana : Fruit { }
class SampleClass
    {
    public static void Main()
        {

        List<Fruit> fruits = new List<Fruit>() { new Apple(), new Apple() };
        List<Banana> bananas = new List<Banana>() { new Banana(), new Banana() };
        fruits.AddRange(bananas);

        }
    }

But without some relationship between them, you can only combine them into a List of a class from which they both inherit.

You could use a Mapper. A Mapper maps one Type to another Type where the property names are the same, the other Type must have a default constructor. A popular Mapper is AutoMapper the one used here is a home-brewed version but the syntax is similar.

List<Animal> animals = new List<Animal>
           {
               new Animal(){Name="Dog",Legs=4},
               new Animal(){Name="Human",Legs=2},
               new Animal(){Name="Spider",Legs=8}

           };
           List<Animal2> animals2 = new List<Animal2>
           {
              new Animal2(){Name="Insect",Legs=6},
               new Animal2(){Name="Fish",Legs=0}

           };
           //     source   target
           Mapper<Animal2, Animal> myMapper=new Mapper<Animal2, Animal>();
           var query = animals2.Select(a => myMapper.Map(a));
           animals.AddRange(query);

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