System.Linq.Tests.JoinTests.OuterNull C# (CSharp) Méthode

        public void OuterNull()
        {
            IQueryable<CustomerRec> outer = null;
            AnagramRec[] inner = new []
            {
                new AnagramRec{ name = "miT", orderID = 43455, total = 10 },
                new AnagramRec{ name = "Prakash", orderID = 323232, total = 9 }
            };

            Assert.Throws<ArgumentNullException>("outer", () => outer.Join(inner.AsQueryable(), e => e.name, e => e.name, (cr, or) => new JoinRec { name = cr.name, orderID = or.orderID, total = or.total }, new AnagramEqualityComparer()));
        }