EF Core and Collection ordering by specified column: move up and down - entity-framework

Question

What is a best way to implement ordering in collection?
Need to support operations like move up and move down.
public class Item
{
public int Id { get; set; }
public string Name { get; set; }
public int Priority { get; set; }
public List<Item> Items { get; set; }
}

Answer 1

This is a console applciation which demonstrates how to move up and down elements of a list.
I hope it helps you.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApp2
{
public enum MoveDirection
{
Up,
Down
}
static class Program
{
static void Main(string[] args)
{
List<string> MyList = new List<string>
{
"Value 1", "Value 2", "Value 3"
};
DisplayList(MyList);
Console.WriteLine("----------------");
Move(MyList, 1, MoveDirection.Down);
DisplayList(MyList);
Console.WriteLine("----------------");
Move(MyList, 2, MoveDirection.Up);
DisplayList(MyList);
Console.ReadLine();
}
public static void Move(List<string> list, int iIndexToMove, MoveDirection direction)
{
if (direction == MoveDirection.Up && iIndexToMove > 0)
{
var old = list[iIndexToMove - 1];
list[iIndexToMove - 1] = list[iIndexToMove];
list[iIndexToMove] = old;
}
else if(direction == MoveDirection.Down && iIndexToMove < list.Count() - 1)
{
var old = list[iIndexToMove + 1];
list[iIndexToMove + 1] = list[iIndexToMove];
list[iIndexToMove] = old;
}
}
public static void DisplayList(List<string> list)
{
foreach (var item in list)
{
Console.WriteLine(item);
}
}
}
}