silverlight中使用NavigationContext.QueryString动态加载文章

        private void InitDocument(string _columnname)
        {
            YDZSWebServiceSoapClient client = new YDZSWebServiceSoapClient();
            client.GetServerSidePathByColumCompleted += client_GetServerSidePathByColumCompleted;
            client.GetServerSidePathByColumAsync(_columnname);
        }

        void client_GetServerSidePathByColumCompleted(object sender, GetServerSidePathByColumCompletedEventArgs e)
        {
            byte[] stream = e.Result;
            DocxFormatProvider docxProvider = new DocxFormatProvider();
            viewer.RadDocument = docxProvider.Import(stream);
        }


        // 当用户导航到此页面时执行。
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            Grid parent = App.Current.RootVisual as Grid;
            slApp.MainPage m = parent.Children.First() as slApp.MainPage;
            m.menu.SelectedTitle = "投资指南";

            string _columnname;
            //如果带有查询参数，根据参数加载文章
            if (this.NavigationContext.QueryString.ContainsKey("columnName"))
            {
                _columnname = Convert.ToString(this.NavigationContext.QueryString["columnName"]);
                InitDocument(_columnname);
            }
        }

        private void keysearch_Click(object sender, RoutedEventArgs e)
        {
            Grid parent = App.Current.RootVisual as Grid;
            slApp.MainPage m = parent.Children.First() as slApp.MainPage;
            string uriText = String.Format("GuidePage/ziliao?columnName={0}", txtkey.Text);
            m.ContentFrame.Navigate(new Uri(uriText,UriKind.Relative));
        }