public static string IsolateCallV1(PageContentHandler pHandler)
        {
            string name = Guid.NewGuid().ToString("N");
            var domain = AppDomain.CreateDomain(name);
            try
            {
                var proxy = domain.CreateInstanceAndUnwrap("xx","xx");
                string ret = (string)proxy.DoEntry(pHandler);
                if (ret == null)
                {
                    throw new InvalidOperationException();
                }
                return ret;
            }
            finally
            {
                //AppDomain不能即时卸载？不能在IDisposable中卸载？

                //App.LogInfo("IsolateCollect Unload {0}@{1}", domain.FriendlyName, AppDomain.CurrentDomain.FriendlyName);
                //AppDomain.Unload(domain);
                new JobTimer(state =>
                {
                    try
                    {
                        var d = (AppDomain)state;
                        //if (d.IsFinalizingForUnload())
                        //{
                        //    return;
                        //}
                        App.LogInfo("IsolateCollect Unload {0}", d.FriendlyName);
                        AppDomain.Unload(d);
                    }
                    catch (Exception ex)
                    {
                        App.LogError(ex, "IsolateCollect");
                    }
                }, DateTime.Now.AddSeconds(20d)).Start(domain);
            }
        }