List<DateTime> Post call issue - entity-framework

Question

I'm trying to do a JSON post call using a List property (RecurrenceException) but once the AddAppointment() method is called, RecurrenceException will always be null as its supposed to be but I get this exception on my API controller:
Microsoft.Data.SqlClient.SqlException: 'The parameterized query '(#PK int,#Title nvarchar(8),#Description nvarchar(8),#StartDate ' expects the parameter '#RecurrenceException', which was not supplied.'
Below is my client Razor Page code:
async Task AddAppointment(SchedulerCreateEventArgs e)
{
UvwHolidayPlanner holidayPlannerItem = e.Item as UvwHolidayPlanner;
List<DateTime> lst = new List<DateTime>();
holidayPlanner.Pk = holidayPlannerItem.Pk;
holidayPlanner.Title = holidayPlannerItem.Title;
holidayPlanner.Description = holidayPlannerItem.Description;
holidayPlanner.StartDate = holidayPlannerItem.StartDate;
holidayPlanner.EndDate = holidayPlannerItem.EndDate;
holidayPlanner.IsAllDay = holidayPlannerItem.IsAllDay;
if (holidayPlannerItem.RecurrenceRule == null)
{
holidayPlanner.RecurrenceRule = " ";
}
else
{
holidayPlanner.RecurrenceRule = holidayPlannerItem.RecurrenceRule;
}
holidayPlanner.RecurrenceException = holidayPlannerItem.RecurrenceException;
holidayPlanner.RecurrenceId = holidayPlannerItem.RecurrenceId;
await http.CreateClient("ClientSettings").PostAsJsonAsync<UvwHolidayPlanner>($"{_URL}/api/HolidayPlannerOperations/HolidayPlanner", holidayPlanner);
HolidayPlanners = (await http.CreateClient("ClientSettings").GetFromJsonAsync<List<UvwHolidayPlanner>>($"{_URL}/api/lookup/HolidayPlanner"))
.OrderBy(t => t.Title)
.ToList();
StateHasChanged();
}
Below is my class code:
public class UvwHolidayPlanner
{
public string Title { get; set; }
public string Description { get; set; }
public DateTime StartDate { get; set; }
public DateTime EndDate { get; set; }
public bool IsAllDay { get; set; }
public int Pk { get; set; }
public string RecurrenceRule { get; set; }
public List<DateTime> RecurrenceException { get; set; }
public int RecurrenceId { get; set; }
}
And below is my API controller code:
[HttpPost]
[Route("HolidayPlanner")]
public void Post([FromBody] UvwHolidayPlanner item)
{
string SQLSTE = "EXEC [dbo].[usp_AddHolidayPlanner] #PK, #Title, #Description, #StartDate, #EndDate, #IsAllDay, #RecurrenceRule, #RecurrenceException, #RecurrenceId";
using (var context = new TestAppContext())
{
List<SqlParameter> param = new List<SqlParameter>
{
new SqlParameter { ParameterName = "#PK", Value = item.Pk },
new SqlParameter { ParameterName = "#Title", Value = item.Title },
new SqlParameter { ParameterName = "#Description", Value = item.Description },
new SqlParameter { ParameterName = "#StartDate", Value = item.StartDate },
new SqlParameter { ParameterName = "#EndDate", Value = item.EndDate },
new SqlParameter { ParameterName = "#IsAllDay", Value = item.IsAllDay },
new SqlParameter { ParameterName = "#RecurrenceRule", Value = item.RecurrenceRule },
new SqlParameter { ParameterName = "#RecurrenceException", Value = item.RecurrenceException },
new SqlParameter { ParameterName = "#RecurrenceId", Value = item.RecurrenceId }
};
context.Database.ExecuteSqlRaw(SQLSTE, param);
}
}