如何从两个值中创建列表?

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问题描述

不确定如何为这个问题写一个好标题...:)

我是Linq的新手，不确定该问题要使用什么语法，我有

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)

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?#
               })

这里标有正确语法的零件?#我的问题是我的问题. 我想将v.field3和v.field4作为项目添加到Mainclass中的主要列表 - 对象，但我不知道该怎么做.

我很高兴有人能提供帮助.

其他推荐答案

不确定我是否正确理解您.但是以下对我有用:

var myTable = new [] {
            new {Field1 = "a", Field2 = "b", Field3 = "c", Field4 = "d"},
            new {Field1 = "a", Field2 = "b", Field3 = "c", Field4 = "d"}
        };



        var myQuery = (from v in myTable
                       select new MainClass()
                       {
                        MainKey = v.Field1,
                        MainName = v.Field2,
                        MainList = new List<SmallObject>{
                            new SmallObject {SmallKey = v.Field3},
                            new SmallObject {SmallKey = v.Field4},
                        }
                       });

myquery充满了2个对象(主级)，两个对象都有一个主列表，每个对象都包含2个项目(SmallObject).

顺便说一句，没有真正看到以下行是:

var mainQuery = (from v from myTable
             select v)

，但是正如我所说的，也许我不正确理解你

gl！

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问题描述

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

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 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?#
               })

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.

I'm happy if anyone can help.

其他推荐答案

Not really sure if I understand you correctly. But the following works for me:

var myTable = new [] {
            new {Field1 = "a", Field2 = "b", Field3 = "c", Field4 = "d"},
            new {Field1 = "a", Field2 = "b", Field3 = "c", Field4 = "d"}
        };



        var myQuery = (from v in myTable
                       select new MainClass()
                       {
                        MainKey = v.Field1,
                        MainName = v.Field2,
                        MainList = new List<SmallObject>{
                            new SmallObject {SmallKey = v.Field3},
                            new SmallObject {SmallKey = v.Field4},
                        }
                       });

myQuery is filled with 2 objects (MainClass), with both a Mainlist, each containting 2 items (SmallObject).

Btw, don't really see what the following line is for:

var mainQuery = (from v from myTable
             select v)

But as I said, maybe I don't understand you correctly

GL!

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