CODEWITHSUNDEEP
c#linq
kayton
kayton

Reputation: 3759

LINQ - get all members of a certain type in a list of object

I have a class holding a Color and a string:

 public class Magic{
   public string Name {get; set;}
   public Color MyColor {get; set;}
 }

I have a List of them:

List<Magic> MyList = new List<Magic>();

I'm not too experienced with LINQ and I want to know how to get all Color objects in the List into a new List of just the Colors

Upvotes: 2

Views: 3733

Answers (3)

Eric Burdo
Eric Burdo

Reputation: 814

I used the .FindAll approach.

var lst = GetAllProducts();

List<ProductModel> sel = lst.FindAll(x => x.IsActive == true);

return sel;

I have a method that gets all the products into a List<>. My Product Model has a property called IsActive (a boolean).

This code creates a new List<> of just the Active=True products.

Upvotes: 0

Michael Teper
Michael Teper

Reputation: 4651

The question is a bit vague, and if you are looking for a projection of colors, then @ChrisSinclair answer is correct.

If, on the other hand, you want to filter by color, then you can do it like this:

var magicS = (from magic in MyList where magic.MyColor == s select magic).ToList();

or

var magicS = MyList.Where(m => m.MyColor == s).ToList();

Upvotes: 1

Chris Sinclair
Chris Sinclair

Reputation: 23208

You would use the Select method:

List<Color> magicColors = MyList
    .Select(magic => magic.MyColor)
    .ToList();

If you want only the unique colours:

List<Color> magicColors = MyList
    .Select(magic => magic.MyColor)
    .Distinct()
    .ToList();

The idea is that for every Magic, it will pull out its MyColor. That's what the Select(magic => magic.MyColor) does.

Upvotes: 6

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