public async TaskSignIn(LoginViewModel model, string returnUrl) { if (ModelState.IsValid) { var user = await UserManager.FindAsync(model.Username, model.Password); if (user != null) { if (await UserManager.GetTwoFactorEnabledAsync(user.Id) && await TwoFactorSignInAsync(DefaultAuthenticationTypes.TwoFactorCookie, model.TwoFactorCode, isPersistent: false, rememberBrowser: model.RememberBrowser)) { // User has been authenticated with two-factor authentication return RedirectToLocal(returnUrl); } else if (!await UserManager.GetTwoFactorEnabledAsync(user.Id)) { // Two-factor authentication is not enabled for this user return RedirectToLocal(returnUrl); } } // Authentication failed ModelState.AddModelError("", "Invalid username or password"); return View(model); } // Model is invalid return View(model); }
var result = await SignInManager.TwoFactorSignInAsync(model.Provider, model.Code, isPersistent: model.RememberMe, rememberBrowser: model.RememberBrowser); switch (result) { case SignInStatus.Success: return RedirectToLocal(returnUrl); case SignInStatus.LockedOut: return View("Lockout"); case SignInStatus.Failure: default: ModelState.AddModelError("", "Invalid code."); return View(model); }In this example, the user is attempting to sign in with a two-factor authentication code. The TwoFactorSignInAsync method is called with the provider (e.g. email, phone), code, and remember settings. The result is then evaluated and the appropriate action is taken based on the enum value returned. In conclusion, ApplicationSignInManager TwoFactorSignInAsync is a method provided by the Microsoft.AspNet.Identity.Owin library that allows for a second level of authentication using a code or token. It is useful for adding an extra layer of security to user accounts.