Lamda表达式实现Left join解决方法

var query = User.GroupJoin(Charge, u => u.Account, c => c.Account, (u, c) => new { u, c }).Select(data => new AnalysisPlayer { Account = data.u.Account, PlayerName = data.u.Name, RegTime = data.u.CreateTime ?? DateTime.Now, Points = 此处如何写代码 });public class AnalysisPlayer{        /// <summary>        /// 玩家名称        /// </summary>        public string PlayerName { get; set; }        /// <summary>        /// 玩家账号        /// </summary>        public string Account { get; set; }        /// <summary>        /// 注册时间        /// </summary>        public DateTime RegTime { get; set; }        /// <summary>        /// 充值总数        /// </summary>        public int Points { get; set; }}