ApplicationParts.Controllers.AccountController.ExternalLogin C# (CSharp) Метод

        public IActionResult ExternalLogin(string provider, string returnUrl = null)
        {
            // Request a redirect to the external login provider.
            var redirectUrl = Url.Action("ExternalLoginCallback", "Account", new { ReturnUrl = returnUrl });
            var properties = _signInManager.ConfigureExternalAuthenticationProperties(provider, redirectUrl);
            return Challenge(properties, provider);
        }