在Accountcontrolle中设置cookie

Question

Response.Cookies.Add（new HttpCookie（FormsAuthentication.FormsCookieName，encTicket））; 我使用此代码，但它返回Object引用未设置为对象的实例。 它有什么问题

Answer 1

你应该在构造函数之外创建cookie，这样你至少可以看出它抛出异常的原因。

通常对于这样的事情，我会做以下事情：

// 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，至少可以让你找出造成你的空引用异常的原因，如果不能完全修复这个问题。