使用C＃和XAML更新或刷新Windows Phone 8.1应用程序中的Listview

5 回答

• 3

  刷新是什么意思？如果要刷新UI，则myList必须是ObservableCollection类型，并且您的类必须实现INotifyPropertyChanged接口 .

  看看这篇文章

  https://msdn.microsoft.com/en-us/library/system.componentmodel.inotifypropertychanged%28v=vs.110%29.aspx

  回复于 2024-05-09T18:35:35+08:00
• 0

  您需要使用和ObservableCollection

  public ObservableCollection<string> MyList { get; set; }
  

  将可观察集合设置为ItemsSource后，对集合的每次更改都将自动反映在列表视图中 .

  回复于 2024-05-09T18:35:35+08:00
• 0

  很高兴看到它仅通过使用 System.Collections.ObjectModel.ObservableCollection 起作用，然后在 ListView.ItemsSource 中设置集合 .

  回复于 2024-05-09T18:35:35+08:00
• 2

  试试这个

  if (ListView.Items.Count > 0)
    {
       ListView.ItemsSource = null;
    }
    listItem.Clear();
  

  仅分配新的列表视图对象不会清除数据 . 您需要清除ItemSource并清除用于绑定列表视图的列表数组

  回复于 2024-05-09T18:35:35+08:00
• 0

  我创建了一个测试应用程序 - krayknot来测试这个场景，这里是代码：

  包括INotifyPropertyChanged

  public sealed partial class PivotPage : Page, INotifyPropertyChanged
  

  创建eventhandler

  public event PropertyChangedEventHandler PropertyChanged;
  

  创建ObservableCollection

  ObservableCollection<Feeds> oc = new ObservableCollection<Feeds>();
  

  这是方法，

  private async void BindFeeds(string URL)
          {
              progressRing.IsActive = true;
  
              var uri = new Uri(URL);
              var httpClient = new HttpClient();
  
              // Always catch network exceptions for async methods
              httpClient.DefaultRequestHeaders.Add("Cache-Control", "no-cache");
              var result = await httpClient.GetAsync(uri);
  
              var xmlStream = await result.Content.ReadAsStreamAsync();
              XDocument loadedData = XDocument.Load(xmlStream);
  
              foreach (var data in loadedData.Descendants("Table"))
              {
  
  
                  try
                  {
                      oc.Add(new Feeds
                      {
                          BlogId = data.Element("Blogs_CID").Value.ToString(),
                          Description = data.Element("Blogs_BriefDescription").Value.ToString(),
                          IconImage = videoIcon,
                          Heading = data.Element("Blogs_Heading").Value.ToString().Trim(),
                          MainImage = feedImageThumbnail, //data.Element("Blogs_SquareImagePath").Value.ToString(),
                          TimeStamp = data.Element("TimeElapsed").Value.ToString(),
                          SourceURL = data.Element("Blogs_SourceURL").Value.ToString()
                      });
  
                  }
                  catch (Exception)
                  {
                      //throw;
                  }               
              }
              httpClient.Dispose();
  
              if (lstLatest.Items.Count == 0)
              {
                  lstLatest.ItemsSource = oc;
              }
              else
              {
                  NotifyPropertyChanged();
              }
  
              httpClient.Dispose();
              progressRing.IsActive = false;
          }
  

  回复于 2024-05-09T18:35:35+08:00