Handling Next Record nullable reference Controller Code to pass to viewbag - asp.net-mvc

Question

I have researched various nullable reference handling posts, but not finding anything helpful. So what I am doing below to handle this null reference (it's a hack for now to stop the error page from displaying to users) is to essentially return the current id if a next record does not exist in my edit controller.
public async Task<IActionResult> Edit(int? id)
{
if (id == null)
{
return NotFound();
}
var myInClause = new string[] { "a", "c", "k" };
var myQueryResults = await _context.MyClass.FindAsync(id);
int? NextIdObject = (from i in _context.MyClass
where myInClause.Contains(i.RowType) && (i.Id > myclass.Id)
select new { i.Id }).DefaultIfEmpty().First().Id;
if (!NextIdObject.Equals(0))
{
ViewBag.nextID = NextIdObject;
}
else
{
ViewBag.nextID = id;
}
if (myQueryResults == null)
{
return NotFound();
}
return View(myQueryResults);
}
I would prefer to just redirect to the index page (if they hit this error, it means they are done working through a queue anyway, no next record would ever exist here). Or maybe just keep the code as is and display a message on the button to indicate end of list. Any thoughts here. Note, using any +1 increment on the id does not work for me, as I don't need the user to see all id records, just the one's with a/c/k which is why I bring the myInclause variable in. If there is a better way to use the SQL sytanx of "IN" for Linq queries, I am all ears.

Answer 1

I would prefer to just redirect to the index page (if they hit this
error, it means they are done working through a queue anyway, no next
record would ever exist here)
You could use try...catch block simply like
try
{
var myInClause = new string[] { "a", "c", "k" };
var myQueryResults = await _context.MyClass.FindAsync(id);
int NextIdObject = (from i in _context.MyClass
where myInClause.Contains(i.RowType) && (i.Id > myclass.Id)
select new { i.Id }).DefaultIfEmpty().First().Id;
ViewBag.nextID = NextIdObject;
}
catch(Exception ex)
{
return RedirectToAction("Index");
//or return View("Index");
}
return View(myQueryResults);