Question

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.

Answer 1

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 }

Update:

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 },
}

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