Linq查询数据集取得排序后的序列号(行号)

今天群里有同学问如何用linq取结果集的行号，查了一下资料，发现linq有很简单的方法可以实现，花了几分钟写了一个测试用例，现记录下来，以备参考：

    /// <summary>
    /// 测试类
    /// </summary>
    public class models
    {
        public int id { set; get; }
        public string Name { set; get; }
        public string Phone { set; get; }
        public string Address { set; get; }
        public DateTime Birthday { set; get; }
        private static int idx { set; get; } = 0;
        public models()
        {
            id = idx++;
            Name = "testName" + id.ToString();
            Phone = "testPhone" + id.ToString();
            Address = "testAddress" + id.ToString();
            Birthday = DateTime.Now.AddHours(id);
        }

    }

下面是实现方法：

            var list = new List<models>();
            list.Add(new models());
            list.Add(new models());
            list.Add(new models());
            list.Add(new models());
            list.Add(new models());
            list.Add(new models());
            var tt = list.OrderBy(p => p.Name).OrderByDescending(p =>p.Birthday).OrderByDescending(p => p.id).Select((p, idx) => new {
                row = idx,
                name = p.Name,
                phone = p.Phone
            });