webbrowser InvokeMember("event or script")

        public static List<RegionInfo> GetRegionInfosFromWeb(WebBrowser ie)
        {
            List<RegionInfo> citys = new List<RegionInfo>();

            HtmlElement element = ie.Document.All.GetElementsByName("strCity")[0];
if (element == null) return new List<RegionInfo>();

foreach (HtmlElement el in element.Children)
            {
                RegionInfo info = new RegionInfo();

                el.SetAttribute("Selected", "true");
                info.City = el.GetAttribute("Value");
                element.InvokeMember("onclick");

                Thread.Sleep(1000);

                HtmlElement e = ie.Document.All.GetElementsByName("strDistrict")[0];
if (e == null)
                {
                    Debug.WriteLine(string.Format("»ñÈ¡{0}µÄ×ÓµØÇø³ö´í", info.City));
continue;
                }

                info.SubCitys = new List<string>();
foreach (HtmlElement m in e.Children)
                {
                    m.SetAttribute("Selected", "true");
if (!string.IsNullOrEmpty(m.GetAttribute("value")))
                        info.SubCitys.Add(m.GetAttribute("value"));
                }

                citys.Add(info);
            }

return citys;
        }

webbrowser 采集数据时很好用，遗憾的是不能在非UI线程上工作