如何从两个值创建列表? [英] How to create a list from two values?

问题描述

不确定如何为这个问题写一个好标题...:)

Wasn't sure how to write a good title for this question... :)

我是Linq的新手，不确定要使用什么语法解决这个问题

I'm new to Linq and not sure what syntax to use for this problem I have

class MainClass()
{
  string MainKey {get;set;}
  string MainName {get;set;}
  List<SmallObject> MainList {get;set}
}

class SmallObject()
{
  string SmallKey {get;set}
}

Linq:

myTable包含4个字符串字段(Field1，Field2，Field3，Field4)

myTable contains of 4 string fields (Field1, Field2, Field3, Field4)

var mainQuery = (from v from myTable
                 select v)    

var myQuery = (from v in mainQuery
               select new MainClass()
               {
                MainKey = v.Field1,
                MainName = v.Field2,
                MainList = #whats the correct syntax here?#
               })

标有#的语法在这里是什么?#是我的问题. 我想将v.Field3和v.Field4作为项目添加到MainClass的MainList对象中，但是我不知道该怎么做.

The part marked with #whats the correct syntax here?# is my problem. I want to add v.Field3 and v.Field4 as items to the MainList-object in MainClass, but I don't know how to do that.

如果有人能帮助我，我感到很高兴.

I'm happy if anyone can help.

推荐答案

您可以创建List<T>(或任何其他集合)并使用

You can create a List<T> (or any other collection) and add items to it with a collection initializer:

MainList = new List<SmallObject> { v.Field3, v.Field4 }

更新:

由于Field3和Field4是字符串，因此您只需做已经做的事情就可以将它们变成SmallObject s:

Since Field3 and Field4 are strings, you would just do what you already do to make them into SmallObjects:

MainList = new List<SmallObject>
{ 
    new SmallObject { SmallKey = v.Field3 },
    new SmallObject { SmallKey = v.Field4 },
}

或者，您可以添加一个带有字符串参数的SmallObject构造函数，并像new SmallObject(v.Field3)一样使用它.

Or, you could add a SmallObject constructor that takes a string argument and use it like new SmallObject(v.Field3).

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