如何让我的delete方法接受null值

Question

现在这个方法会删除一个已经填写了所有字段的职位。我需要它来删除这个职位，即使没有填写所有字段(接受空值(。以下是控制器方法：

[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public ActionResult DeleteConfirmed(int id)  // triggered when Delete "Job Title" is pressed
{
Job job = db.Jobs.Find(id);  // finds Job to delete in Jobs table
ShiftTime shift = db.ShiftTime.Find(id);  //  finds shifttimes attached to Job being deleted in ShiftTimes table
JobOther other = db.JobOthers.Find(id); //  finds JobsOthers attached to Job being deleted in JobOthers table
var schedules = db.Schedules.Where(x => x.Job.JobIb == id);    // finds list of schedules attached to Job being deleted in Schedules table
foreach (Schedule schedule in schedules)  //  iterates through list of schedules attached to Job being deleted....
{
db.Schedules.Remove(schedule);  // ...and removes schedules
}
db.ShiftTime.Remove(shift);  // removes ShiftTimes
db.JobOthers.Remove(other); // removes JobOthers
db.Jobs.Remove(job);  // removes actual Job
db.SaveChanges();   // finally saves changes to each table
return RedirectToAction("Index"); // returns to "Index" list of Jobs 
}

我想我必须加入一些if/else语句，但我尝试了很多不同的变体，但都无济于事。

Answer 1

我的理解是，对于给定的id，总是有一个job，但可能没有其他对象shift, other, schedules。要让job在其他为null的情况下删除，请在删除方法之前进行null检查：

if (schedules != null) 
{ 
// the foreach 
}
...
if (shift != null) db.ShiftTime.Remove(shift);
...
if (other != null) db.JobOthers.Remove(other);

Answer 2

您尝试过吗：

db.Entry(job).State = EntityState.Deleted;

而不是

db.Jobs.Remove(job);