In this article, I will show you how to check if a record exists before insert in to the database using entity framework in c#.
You can use Any() because it will check soon as matches in records.
Entity framework-exists record:
if (ModelState.IsValid)
{
if (db.UserLogins.Any(r => r.Name == userlogin.Name))
{
TempData["message"] = "User name already exists";
return View(userlogin);
}
db.UserLogins.Add(userlogin);
db.SaveChanges();
return RedirectToAction("Index");
}
You can also achieve using Count(), but it will check each row of the record before returning. So above one is best to check exists record.
if (db.UserLogins.Where(d => d.Name ==userlogin.Name).Count() > 0)
{
TempData["message"] = "User name alreadyexists";
return View(userlogin);
}
else{ // save record }
Post your comments / questions
Recent Article
- Requested setting INSTALLED_APPS, but settings are not configured. You must either define..
- ValueError:All arrays must be of the same length - Python
- Check hostname requires server hostname - SOLVED
- How to restrict access to the page Access only for logged user in Django
- Migration admin.0001_initial is applied before its dependency admin.0001_initial on database default
- Add or change a related_name argument to the definition for 'auth.User.groups' or 'DriverUser.groups'. -Django ERROR
- Addition of two numbers in django python
- The request was aborted: Could not create SSL/TLS secure channel -Error in Asp.net
Related Article