asp.net-mvc - ASP.NET MVC 在创建用户时获取 userId？

Question

注册时想获取UserId

[AllowAnonymous]
    [HttpPost]
    public ActionResult Register(RegisterModel model)
    {
        if (ModelState.IsValid)
        {
            // Attempt to register the user
            MembershipCreateStatus createStatus;
            Membership.CreateUser(model.UserName, model.Password, model.Email, passwordQuestion: null, passwordAnswer: null, isApproved: true, providerUserKey: null, status: out createStatus);

            if (createStatus == MembershipCreateStatus.Success)
            {
                FormsAuthentication.SetAuthCookie(model.UserName, createPersistentCookie: false);
                //Object reference not set to an instance of an object.
                Guid id = (Guid)System.Web.Security.Membership.GetUser().ProviderUserKey;
                System.Web.Security.Roles.AddUserToRole(model.UserName, "User");
                return RedirectToAction("Index", "Home");
            }
            else
            {
                ModelState.AddModelError("", ErrorCodeToString(createStatus));
            }
        }

        // If we got this far, something failed, redisplay form
        return View(model);
    }

但是出现错误(“对象引用未设置到对象的实例。”)。如何在register方法中获取userId？

谢谢。

Answer 1

FormsAuthentication.SetAuthCookie验证下一个 请求，System.Web.Security.Membership.GetUser() 对同一请求将返回 null:

The SetAuthCookie method adds a forms-authentication ticket to either the cookies collection or the URL if CookiesSupported is false. The forms-authentication ticket supplies forms-authentication information to the next request made by the browser. With forms authentication, you can use the SetAuthCookie method when you want to authenticate a user but still retain control of the navigation with redirects.

Membership.CreateUser 返回创建的用户，因此您应该能够这样做:

[AllowAnonymous]
[HttpPost]
public ActionResult Register(RegisterModel model)
{
    if (ModelState.IsValid)
    {
        // Attempt to register the user
        MembershipCreateStatus createStatus;
        MembershipUser membershipUser = Membership.CreateUser(model.UserName, model.Password, model.Email, passwordQuestion: null, passwordAnswer: null, isApproved: true, providerUserKey: null, status: out createStatus);

        if (createStatus == MembershipCreateStatus.Success)
        {
            FormsAuthentication.SetAuthCookie(model.UserName, createPersistentCookie: false);
            Guid id = (Guid)membershipUser.ProviderUserKey;
            ...