Get list items by checking priority of another list using linq

Question

I need to implement something,

I have an item list with different priorities and I need to select the items based on these priorities. For that, I have another list of priorities. If priority "one" does not match it should check the second priority and so on. This can be checked with a simple foreach loop and check with .Any() function. But I'm wondering this can be done with a single LINQ query.

enum Brand
{
   Nike,
   Adidas,
   Levis
}
class Info
{
   public Brand Brand { get; set; }
   public int Status{ get; set; }
   public int Group{ get; set; }
}

var list = new Info[]
{
  new Info{Brand = Brand.Nike, Status = 0, Group = "C"},
  new Info{Brand = Brand.Adidas, Status = 0, Group = "D"},
  new Info{Brand = Brand.Nike, Status = 4, Group = "A"},
  new Info{Brand = Brand.Levis, Status = 0, Group = "B"},
  new Info{Brand = Brand.Adidas, Status = 5, Group = "B"}
};
List<string> groupPririties = new List<string>() { "B", "D", "A", "E" };

According to this item list and priority list, I should get Levis and Addidas only. But if those two are not on the list it should return Adidas item and so on. If I dont have any priority matching items in my list, it should return null.

Can I acheive this with linq query only?

Answer 1

But I'm wondering this can be done with a single LINQ query

var priorityItems = list
    .GroupBy(x => x.Group)
    .Where(grp => groupPririties.Contains(grp.Key))
    .OrderBy(grp => groupPririties.IndexOf(grp.Key))
    .FirstOrDefault();