模型类中的C＃员工关系

如何解决模型类中的C＃员工关系

我面临使用C＃LINQ解决复杂逻辑的困难

我有一个使用核心实体框架3.1生成的Model类：

   public partial class Employee
    {
        
        public int EmpId { get; set; }
        
        public string Fname { get; set; }
        
        public string Lname { get; set; }
        
        public string Emailid { get; set; }
        
        ublic int? ManagerId { get; set; }    //(self-referential integrity to employeeid)

        public varchar EmployeeDesignation { get; set; }
    }

我有一个操作方法：

public async Task<IActionResult> GetEmployees()
        {      
        
            var employe = await _employee.GetEmployees();
            if (employe == null)
                return NotFound();
            else
            {
                    //Need a LINQ logic here 
                    
      
            }
        
        }

逻辑需要实现：

最初EmployeeDesignation属性为空，但是在LINQ的帮助下，我需要根据以下3个条件分配值

1. EmployeeDesignation  need be “Associate” when no other employee is reporting to this employee 
2. EmployeeDesignation  need be “Manager” when one or more employees are reporting to this employee
3. EmployeeDesignation  need be “Head” when one or more managers are reporting to this employee

因此，对于每个employeeid，根据上述3个条件，EmployeeDesignation属性必须是Associate或Manager或Head。

LINQ逻辑后的异常输出：

employeeid :8
ftname : Tom
lName : Cru
emailid : [e-mail]
managerId: null
EmployeeDesignation: Associate

employeeid :9
fname : nee
lName : wili
emailid : [e-mail]
managerId: 3
EmployeeDesignation: Manager

如何在c＃中使用LINQ，EF来实现这一目标？

感谢您分享知识。

编辑：

可以参考下图

Please click the link to see the image

解决方法

如果我说对了：

private static string GetEmployeeDesignation(Employee employee,IEnumerable<Employee> employees)
{
    if (!employee.ManagerId.HasValue)
    {
        return "Head";
    }

    if (!employees.Any(m => m.ManagerId == employee.EmpId))
    {
        return "Associate";
    }

    return "Manager";
}

所以您的预期输出可能像：

var result = employees.Select(m =>
{
    m.EmployeeDesignation = GetEmployeeDesignation(m,employees);
    return m;
});