从ASP.NET身份中的Google等外部提供商登录时，将角色添加到用户中

Question

我已经使用ASP.NET身份在项目中实现了外部登录提供商。

它运行良好，但现在我想为通过那些外部提供商登录的用户分配角色。

例如，我想将用户分配或将用户添加到使用其Google/Facebook帐户访问我的网站的人。

Answer 1

内部控制器/accountController有一种称为externalloginConfirnation的方法。

看起来像下面的

    // POST: /Account/ExternalLoginConfirmation
    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> ExternalLoginConfirmation(ExternalLoginConfirmationViewModel model, string returnUrl)
    {
        if (User.Identity.IsAuthenticated)
        {
            return RedirectToAction("Index", "Manage");
        }
        if (ModelState.IsValid)
        {
            // Get the information about the user from the external login provider
            var info = await AuthenticationManager.GetExternalLoginInfoAsync();
            if (info == null)
            {
                return View("ExternalLoginFailure");
            }
            var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
            var result = await UserManager.CreateAsync(user);
            if (result.Succeeded)
            {
                result = await UserManager.AddLoginAsync(user.Id, info.Login);
                if (result.Succeeded)
                {
                    await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
                    return RedirectToLocal(returnUrl);
                }
            }
            AddErrors(result);
        }
        ViewBag.ReturnUrl = returnUrl;
        return View(model);
    }

将呼叫添加到result = await UserManager.AddToRoleAsync(user.Id, "User");如下：

    // POST: /Account/ExternalLoginConfirmation
    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<ActionResult> ExternalLoginConfirmation(ExternalLoginConfirmationViewModel model, string returnUrl)
    {
        if (User.Identity.IsAuthenticated)
        {
            return RedirectToAction("Index", "Manage");
        }
        if (ModelState.IsValid)
        {
            // Get the information about the user from the external login provider
            var info = await AuthenticationManager.GetExternalLoginInfoAsync();
            if (info == null)
            {
                return View("ExternalLoginFailure");
            }
            var user = new ApplicationUser { UserName = model.Email, Email = model.Email };
            var result = await UserManager.CreateAsync(user);
            if (result.Succeeded)
            {
                result = await UserManager.AddLoginAsync(user.Id, info.Login);
                if (result.Succeeded)
                {
                    result = await UserManager.AddToRoleAsync(user.Id, "User");
                    if (result.Succeeded)
                    {
                        await SignInManager.SignInAsync(user, isPersistent: false, rememberBrowser: false);
                        return RedirectToLocal(returnUrl);
                    }
                }
            }
            AddErrors(result);
        }
        ViewBag.ReturnUrl = returnUrl;
        return View(model);
    }