Question

我有一个gridview，它使用链接http://..../mobileapp/GetPostByCategoryXMLa?term_id=(item_id)从JSON数据中获取数据我想如果在点击＆＃34;再试一次＆＃34;时没有互联网连接，它可以再次刷新页面（当有连接互联网时）。 XAML：

<Button x:Name="refreshBtn" Margin="0,15,0,0" Foreground="White" Width="100" Height="40" Content="Try Again" Background="#FF3C3C3C" BorderBrush="White" BorderThickness="1" Click="refreshBtn_Click"/>

完整代码：

public sealed partial class FurnitureCategory : Page
{ 
    private ObservableCollection<Furniture> datasource = new ObservableCollection<Furniture>();

    public FurnitureCategory()
    {
        this.InitializeComponent();
    }

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        //FurnitureHome item = e.Parameter as FurnitureHome;
        Furniture detail = e.Parameter as Furniture;
        StoreDetail(int.Parse(detail.ID));//send id
        pageTitle.Text = detail.Title.ToString();
    }

    private async void StoreDetail(int id)
    {
        statusKosong.Visibility = Visibility.Collapsed;
        koneksiErrorStack.Visibility = Visibility.Collapsed;
        requestErrorStack.Visibility = Visibility.Collapsed;
        ConnectionProfile connections = NetworkInformation.GetInternetConnectionProfile();
        if (connections != null && connections.GetNetworkConnectivityLevel() == NetworkConnectivityLevel.InternetAccess)
        {
            loading.IsActive = true;
            try
            {
                Furniture detail = new Furniture();

                var httpClient = new HttpClient(new HttpClientHandler());
                string urlPath = "http://.../mobileapp/GetPostByCategoryXMLa?term_id="+id;

                var values = new List<KeyValuePair<string, string>>
                {

                };

                HttpResponseMessage response = await httpClient.PostAsync(urlPath, new FormUrlEncodedContent(values));
                response.EnsureSuccessStatusCode();

                if (!response.IsSuccessStatusCode)
                {
                    loading.IsActive = false;
                    RequestException();
                }

                string jsonText = await response.Content.ReadAsStringAsync();
                JsonObject jsonObject = JsonObject.Parse(jsonText);
                JsonArray jsonData1 = jsonObject["posts"].GetArray();

                foreach (JsonValue groupValue in jsonData1)
                {

                    JsonObject groupObject = groupValue.GetObject();

                    double menuId = groupObject["post_id"].GetNumber();
                    string title = groupObject["post_title"].GetString();
                    string image = groupObject["featured_image"].GetString();
                    string deskripsi = groupObject["post_clean"].GetString();

                    Furniture file = new Furniture();
                    file.ID = menuId.ToString();
                    file.Title = title;
                    file.Gambar = image;
                    file.Deskripsi = deskripsi;

                    datasource.Add(file);
                }

                if (jsonData1.Count > 0)
                {
                    itemGridView.ItemsSource = datasource;
                }
                else
                {
                    loading.IsActive = false;
                    statusKosong.Visibility = Visibility.Visible;
                }
            }
            catch (HttpRequestException ex)
            {
                loading.IsActive = false;
                RequestException();
            }
        }
        else
        {
            loading.IsActive = false;
            ConnectionException();
        }
    }

    private void ConnectionException()
    {
        koneksiErrorStack.Visibility = Visibility.Visible;
    }

    private void RequestException()
    {
        requestErrorStack.Visibility = Visibility.Visible;
    }

    private void refreshBtn_Click(object sender, RoutedEventArgs e)
    {
        Furniture detail =  new Furniture();
        StoreDetail(int.Parse(detail.ID));
    }

    private void ItemView_ItemClick(object sender, ItemClickEventArgs e)
    {
        Furniture itemDetail = e.ClickedItem as Furniture;
        DetailId.Text = itemDetail.ID;
        DetailJudul.Text = itemDetail.Title;
        DetailDeskripsi.Text = itemDetail.Deskripsi;
        this.Frame.Navigate(typeof(FurnitureDetail), itemDetail);
    }

    private void Image_ImageOpened(object sender, RoutedEventArgs e)
    {
        loading.IsActive = false;
    }

    private void cover_Loaded(object sender, RoutedEventArgs e)
    {
        loading.IsActive = false;
    }

    private void cover_Loading(FrameworkElement sender, object args)
    {
        loading.IsActive = true;
    }

    private void backButton_Click(object sender, RoutedEventArgs e)
    {
        this.Frame.GoBack();
    }
}

}

家具类：

class Furniture
    {
        public string ID { get; set; }

        public string Title { get; set; }

        public string Gambar { get; set; }

        public string Deskripsi { get; set; }
    }

通过使用上面的代码不起作用并显示错误消息：

如何处理？注意： item_id取自上一页的数据ID，用于用户选择的项目

Answer 1

在RefreshBtn_Click中，您已经创建了一个新按钮，但这不再提供详细ID值，因为它是一个新的（它不会获得/接收任何东西））。虽然，它也让我想知道你为什么要做一个家具课，称呼一个方法，并制作另一个家具类，并给它相同的细节＆＃39;名。

尝试制作宣称详细ID的家具类。这最终可能在两种方法之外发生，通过在开始时声明它。

互联网连接丢失时按钮处理程序

1 个答案: