主要用于管理本地Cookie。

比如提交某http请求后，返回一些cookie，然后加入到本地Cookies数组变量中，用于后续使用。

    // update cookiesToUpdate to localCookies
    // if omitUpdateCookies designated, then omit cookies of omitUpdateCookies in cookiesToUpdate
    public void updateLocalCookies(CookieCollection cookiesToUpdate, ref CookieCollection localCookies, object omitUpdateCookies)
    {
        if (cookiesToUpdate.Count > 0)
        {
            if (localCookies == null)
            {
                localCookies = cookiesToUpdate;
            }
            else
            {
                foreach (Cookie newCookie in cookiesToUpdate)
                {
                    if (isContainCookie(newCookie, omitUpdateCookies))
                    {
                        // need omit process this
                    }
                    else
                    {
                        addCookieToCookies(newCookie, ref localCookies);
                    }
                }
            }
        }
    }//updateLocalCookies

    //update cookiesToUpdate to localCookies
    public void updateLocalCookies(CookieCollection cookiesToUpdate, ref CookieCollection localCookies)
    {
        updateLocalCookies(cookiesToUpdate, ref localCookies, null);
    }

    

    resp = (HttpWebResponse)req.GetResponse();
    updateLocalCookies(resp.Cookies, ref curCookies);