Remove and delete all cookies of my ASP NET c-sharp application

问题

I need remove and delete all cookies of my ASP NET c-sharp application after sent on message email.

I have tried this solution without success because I have this error.

Server cannot modify cookies after HTTP headers have been sent.

In this line:

HttpContext.Current.Response.Cookies.Add(expiredCookie);

The message email started regularly.

The google search does not help me.

Anybody know how can I resolve do this?

Can you suggest?

Can you help me?

My code below.

Thank you in advance.

private void ExpireAllCookies()
{
    if (HttpContext.Current != null)
    {
        int cookieCount = HttpContext.Current.Request.Cookies.Count;
        for (var i = 0; i < cookieCount; i++)
        {
            var cookie = HttpContext.Current.Request.Cookies[i];
            if (cookie != null)
            {
                var cookieName = cookie.Name;
                var expiredCookie = new HttpCookie(cookieName) { Expires = DateTime.Now.AddDays(-1) };
                HttpContext.Current.Response.Cookies.Add(expiredCookie);
            }
        }

        HttpContext.Current.Request.Cookies.Clear();
    }
}



............

    {
        smtpClient.Send(mailMessagePlainText);
        ExpireAllCookies();
        Page.ClientScript.RegisterStartupScript(this.GetType(), "Alert", "alert('Ok.');window.location='http://...';", true);
    }
    catch (Exception ex)
    {
        throw (ex);
    }

回答1:

You can try something like this

if (Request.Cookies["id"] != null)
{
    Response.Cookies["id"].Expires = DateTime.Now.AddDays(-1);   
}

or something like this

Session.Abandon();

Abandon() will only clear the session cookie but not the cookies you set manually. If your specified cookie doesn't exist it will simply return null.

回答2:

The code below works for me

    foreach (string key in Request.Cookies.AllKeys)
    {
       HttpCookie c = Request.Cookies[key];
       c.Expires = DateTime.Now.AddMonths(-1);
       Response.AppendCookie(c);
    }

来源：https://stackoverflow.com/questions/31833109/remove-and-delete-all-cookies-of-my-asp-net-c-sharp-application

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ASP.NET