Sorting an array with the order of another array using LINQ's Join

SortWithJoin.cs

using System;
using System.Linq;

namespace SortWithJoin
{
    class Program
    {
        static void Main(string[] args)
        {
            var keys = new [] { 5, 7, 3, 2, 1, 4, 6, 9, 8 };
            var docs = new[] { (key: 1, val: "uno"), (key: 2, val: "dos"), (key:3, val:"tres") };
            var sorted = from key in keys
                         join doc in docs on key equals doc.key
                         select doc;
            foreach(var doc in sorted)
            {
                Console.WriteLine(doc);
            }
        }
    }
}

Output is

(3, tres)
(2, dos)
(1, uno)