从webBrowser1中获取CookieContainer

private CookieContainer _cookie = new CookieContainer();
private void GetCookie()
{
    if (webBrowser1.Document.Cookie != null)
    {
        string cookieStr = webBrowser1.Document.Cookie;
        string[] cookstr = cookieStr.Split( ';');
        foreach ( string str in cookstr)
        {
            string[] cookieNameValue = str.Split( '=');
            Cookie ck = new Cookie(cookieNameValue[0].Trim().ToString(), cookieNameValue[1].Trim().ToString());
            ck.Domain = ".qq.com";
            _cookie.Add(ck);
        }
    }
}