public IActionResult Add(Link link)
{
ViewBag.AppUrl = _config.GetSection("AppUrl").Value;
if (ModelState.IsValid && Uri.IsWellFormedUriString(link.LinkUrl, UriKind.Absolute))
{
_context.Links.Add(link);
try
{
_context.SaveChanges();
}
catch (DbUpdateException e)
{
if (e.InnerException.Message.Contains("UNIQUE"))
{
ModelState.AddModelError("Key", "The Link Key must be unique");
return View(link);
}
throw;
}
return RedirectToAction("Index");
}
return View(link);
}
private async void IncrementLinkClickCount(Link link)
{
bool saveFailed;
do
{
saveFailed = false;
++link.ClickCount;
try
{
await _context.SaveChangesAsync();
}
catch (DbUpdateConcurrencyException e)
{
saveFailed = true;
link = _context.Links.Where(l => l.Id == link.Id).SingleOrDefault();
}
} while (saveFailed);
}