CODEWITHSUNDEEP
c#linqcollections
Areesha
Areesha

Reputation: 133

Assign data to a child list of another List in Linq

I have 2 Classes lets say ParentClass and ChildClass

public class ParentClass 
{
   public int Property1 {get; set;}
   public List<Child> {get; set;}
}

public class ChildClass
{
   public int Property1 {get; set;}
   public string Property2 {get; set;}
}

Now i have an object of parent class

// in my case all data has been assign to parent object properties except List<ChildClass>
List<ParentClass > parent = data

How can i assign data to List property of parent list without using Loop.

Thanks

Upvotes: 0

Views: 2106

Answers (2)

Sergey Berezovskiy
Sergey Berezovskiy

Reputation: 236248

LINQ (Language-Integrated Query) is for querying. And querying is a thing which does not supposed to cause side-effects. Modifying objects is a pure side-effect. So, Linq is just inappropriate tool here. Even more - internally LINQ uses loops, so there will not be any performance benefit also.

Suggestion - use simple loop to update your objects - its very simple construct which is easy to understand:

foreach(var parent in parents)
   parent.Children = GetChildren(parent.Id);

Without explicit loop you can use List.ForEach:

parents.ForEach(p => p.Children = GetChildren(parent.Id));

But I don't like this approach - why write something that looks like foreach, if you can use foreach? Also introducing lambda adds complexity to your system.

but as CreateMap method of Automapper is not threadsafe

With Automapper you usually create maps on application startup (Main method on Winforms, or Global.asax on web - both are executed on single thread). Also you always can wrap maps creation with lock statement, as with any other code which needs thread synchronization.

Upvotes: 0

Viktor Arsanov
Viktor Arsanov

Reputation: 1593

Cannot really understand what you want to do.

Maybe,

var parent = data.Select(p => new ParentClass{Property1 = p.Property1}).ToList();

You'll get copy of data, but List<Child> property will not be copied.

Upvotes: 1

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