linq 如何将两张表读取后赋值到实体对象的属性

[qq_32395957]

有两张表UserBase和UserInfo为一对一关系，实体类分别如下

public class UserBase
    {
        /// <summary>
        /// Id
        /// </summary>		
        [DataMember]
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }
        /// <summary>
        /// UserName
        /// </summary>		
        [DataMember]
        public string UserName { get; set; }
        /// <summary>
        /// PassWord
        /// </summary>		
        [DataMember]
        public string PassWord { get; set; }

        [DataMember]
        [NotMapped]
        public UserInfo UserInfo { get; set; }//对应子表
}

 public class UserInfo
    {
        /// <summary>
        /// UserId 和主表的主键对应
        /// </summary>		
        [DataMember]
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.None)]
        public int UserId { get; set; }
        /// <summary>
        /// Name
        /// </summary>		
        [DataMember]
        public string Name { get; set; }
        /// <summary>
        /// Sex
        /// </summary>		
        [DataMember]
        public bool Sex { get; set; }
}

linq 的代码如下

 public List<UserBase> UserBase_List()
        {
            var context = new DataContext();
            var query = from a in context.Set<UserBase>()
                        join b in context.Set<UserInfo>()
                        on a.Id equals b.UserId
                        select a;//这样只能获取到UserBase的信息，UserBase.UserInfo无法赋值
                       //select new UserBase{Id = a.Id, UserInfo = b} 如果这样写，会报错“The entity or complex type 'Model.UserBase' cannot be constructed in a LINQ to Entities query”
            return query.ToList();
        }

请问怎么写linq？

[ArmStronger]

select new {Id = a.Id, UserInfo = b}