C# 在Accountcontrolle中设置cookie

Response.Cookies.Addnew HttpCookieFormsAuthentication.FormsCookieName，encTicket； 我使用这段代码，但它返回的对象引用未设置为对象的实例。

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它有什么问题

您应该在构造函数之外创建cookie，这样您至少可以了解它抛出异常的原因

通常，对于类似的情况，我会执行以下操作：

// create the auth cookie with the domain you've specified
var cookie = new HttpCookie(FormsAuthentication.FormsCookieName)
{
    Domain = FormsAuthentication.CookieDomain;
};

// create the auth ticket and encrypt it 
var authTicket = new FormsAuthenticationTicket(1, "USERS_EMAIL_OR_USERNAME", DateTime.Now, DateTime.Now.AddHours(24), true, "ANY_USER_INFO_THAT_SHOULD_GO_INTO_THE_COOKIE");
var encryptedTicket = FormsAuthentication.Encrypt(authTicket);

// set the cookie value to the encrypted ticket
cookie.Value = encryptedTicket;

// now, add it to the response, but remove the old one in case it's still there
Response.Cookies.Remove(FormsAuthentication.FormsCookieName);
Response.Cookies.Add(cookie);

如果有的话，这至少可以让您找出导致空引用异常的原因，如果不能完全解决问题的话。