按日期获取IList / ICollection属性组的计数|实体框架核心

Question

当集合不是空/空时，如何获取集合的CASE计数。 例如我要分析数据，如果用户在Payment IList / ICollection中至少有一项，则获取用户总数。

类图在此列出。单个用户有多个付款记录。

我的用户类别

public class User
{
    public User()
    {
        Payments = new HashSet<Payment>();
        Messages = new HashSet<Message>();
        FileLockResults = new HashSet<FileLockResult>(); 
    }

    [Key]
    public int ID { get; set; }   
    [Required]
    public DateTime RegisteredDate { get; set; }
    public virtual ICollection<Payment> Payments { set; get; } 

}

JSON数据库临时文件：

[
  {
    "ID": "1",
    "RegisteredDate": "1-JAN-2020",
    "Payments": "null"
  },
  {
    "ID": "2",
    "RegisteredDate": "1-JAN-2020",
    "Payments": [
      {
        "Amount" : "150"
      }
    ]
  },
  {
    "ID": "3",
    "RegisteredDate": "1-JAN-2020",
    "Payments": "null"
  },
  {
    "ID": "4",
    "RegisteredDate": "2-JAN-2020",
    "Payments": "null"
  }
]

我需要的结果是：

+------------+-----------------------+------------------------+
| Date       | Total User Registered | User with Payments > 0 |
+------------+-----------------------+------------------------+
| 1-JAN-2020 |           3           |            1           |
+------------+-----------------------+------------------------+
| 2-JAN-2020 |           1           |            0           |
+------------+-----------------------+------------------------+

我暂时尝试过此操作：

  var dataset = dbContext.Users.Include(usrr => usrr.Payments) 
              .GroupBy(x => x.RegisteredDate.Date)
              .Select(x => new
              {
                  Total_User_Registered = x.Count(),
                  Date = (DateTime)x.Key,   
                  Premium_Users = x.Count(u=>u.Payments.Count()>0)
              }).ToList();

问题： 无需付款ICollection / IList计数即可正常工作。但是，当控制台在带有Payments Icollection的ASP NET CORE API中进行呈现时，控制台将显示“ Payments Count”，只是继续滚动并显示以下相同错误：

选择[p0]。[UserID] 来自[付款] AS [p0] Microsoft.EntityFrameworkCore.Database.Command：信息：已执行DbCommand（640毫秒）[Parameters = []，CommandType ='Text'，CommandTimeout = '30']