public IActionResult OnGet(int?id)
{
Symptoms = symptomService.GetSymptoms();
if (id.HasValue)
{
Virus = virusService.GetVirusById(id.Value);
if (Virus == null)
{
return(RedirectToPage("./List"));
}
foreach (var item in Symptoms)
{
foreach (var sv in Virus.VirusSymptoms)
{
if (item.Id == sv.SymptomId)
{
item.IsSelected = true;
}
}
}
}
else
{
Virus = new Virus();
}
return(Page());
}