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我收到此錯誤後點擊刪除：錯誤在刪除項目從MVC服務
try
{
var crews = await GetCrewsAttached(id);
var assetbookings = await _assetBooking.Get(id);
var parts = await GetParts("LTD", id, false);
//Checks if records exist in assetbookings and the employee not attached to any crew and doesnt have any parts associated to the employee
if (assetbookings == null && (crews.Count() == 0 || crews == null) && (parts == null || parts.ToList().Count() == 0))
{
var employee = await _employeeRepository.Get(
e => e.EmployeeID == id,
new List<Expression<Func<gblEmployee, object>>>() {
(e => e.Address),
(e => e.EmployeeTraining.Select(t=>t.Training)),
(e => e.EmployeeWorkSchedule)
});
if (employee != null && employee.IsSupervisor != true)
{
foreach (var training in employee.EmployeeTraining)
{
_employeeTrainingRepository.Delete(training);
}
await _employeeTrainingRepository.Commit();
if (employee.Address != null)
{
_addressRepository.Delete(employee.Address);
await _addressRepository.Commit();
}
_employeeRepository.Delete(employee);
await _employeeRepository.Commit();
}
}
}
catch (Exception ex)
{
throw new NexgenException(ex);
}
我在await _employeeRepository.Commit();
任何方法得到錯誤化解？ 錯誤是操作失敗：該關係無法更改，因爲一個或多個外鍵屬性是不可空的。當對關係進行更改時，相關的外鍵屬性將設置爲空值。如果外鍵不支持空值，則必須定義新的關係，必須爲外鍵屬性指定另一個非空值，或者必須刪除無關對象。