Mit Pivot arbeiten

Question

Ich habe 2 Liste. Eine Liste für Pivot-Header und eine andere für Pivot-Element in einem Pivot-Steuerelement. Ich bin nicht in der Lage, als solche zu binden

Unten ist ein .cs Teil.

public class ViewModel 
{ 
    List<Feed> feeds = new List<Feed>(); 

    public ViewModel() 
    { 
     GetArticlesListingData(); 
    } 

    public List<Feed> Feeds { get { return this.feeds; } } 

    private async Task GetArticlesListingData() 
    { 
     try 
     { 
      for (var k = 0; k < 6; k++) 
      { 
       Feed feed1 = new Feed(); 
       feed1.Title = "National" + k; 



       HttpRequestMessage request1 = new HttpRequestMessage(HttpMethod.Get, "FEEDURL"); 
       request1.Headers.Add("UserAgent", "Windows 8 app client"); 
       request1.Headers.Accept.Add(new System.Net.Http.Headers.MediaTypeWithQualityHeaderValue("application/json")); 
       request1.Headers.Add("Authorization", "bearer " + accessToken); 

       HttpClient client1 = new HttpClient(); 
       HttpResponseMessage response1 = await client1.SendAsync(request1, HttpCompletionOption.ResponseHeadersRead); 
       var result1 = await response1.Content.ReadAsStringAsync(); 
       result1 = Regex.Replace(result1, "<[^>]+>", string.Empty); 
       var rootObject1 = JArray.Parse(result1); 
       int mainitemsCount = rootObject1.Count(); 

       List<Article> articleList = new List<Article>(); 
       for (int i = 0; i < mainitemsCount; i++) 
       { 
        string strHeadline = rootObject1[i]["HeadLine"].ToString(); 
        articleList.Add(new Article 
        { 
         Title = rootObject1[i]["Abstract"].ToString(), 
         HeadLine = rootObject1[i]["HeadLine"].ToString() 
        }); 
       } 

       feed1.Articles = articleList; 
       feeds.Add(feed1); 

      } 
     } 
     catch (Exception ex) 
     { 

     } 
    } 
} 


public class Feed 
{ 
    public string Title { get; set; } 
    public List<Article> Articles { get; set; } 
} 

public class Article 
{ 
    public string Title { get; set; } 
    public string HeadLine { get; set; } 
} 

Unten ist mein XAML Teil,

<Page.Resources> 
    <local:ViewModel x:Key="ViewModel" /> 
    <DataTemplate x:Key="headerTemplate"> 
     <TextBlock Text="{Binding Title}" /> 
    </DataTemplate> 
    <DataTemplate x:Key="pivotTemplate"> 
     <ListView Name="ListBox" ItemsSource="{Binding Articles}"> 
      <ListView.ItemTemplate> 
       <DataTemplate> 
        <StackPanel> 
         <TextBlock Text="{Binding Title}" /> 
         <TextBlock Text="{Binding HeadLine}"/> 
        </StackPanel> 
       </DataTemplate> 
      </ListView.ItemTemplate> 
     </ListView> 
    </DataTemplate> 
</Page.Resources> 

<Pivot DataContext="{StaticResource ViewModel}" x:Name="pivot" HeaderTemplate="{StaticResource headerTemplate}" ItemTemplate="{StaticResource pivotTemplate}" ItemsSource="{Binding Feeds}" ></Pivot> 

Bitte leite mich um dieses Problem zu lösen. Ich mag die Daten wie unten Bild in einem Pivot-Stil

Answer 1

Hier ist eine Arbeitsprobe binden.

Zuerst habe ich ein sehr einfaches View Model erstellt, um gleichzeitig Ihre Menüeinträge und die Artikel zu speichern. Es ist eine Liste von Feed mit einem Titel (der Menüeintrag) und eine Liste von Artikeln.

public class ViewModel : BindableBase 
{ 
    ObservableCollection<Feed> feeds = new ObservableCollection<Feed>(); 

    public ViewModel() 
    { 

    } 

    public async Task LoadFeeds() 
    { 
     var myFeeds = new ObservableCollection<Feed>(); 
     Feed feed1 = new Feed(); 
     feed1.Title = "Feed A"; 
     feed1.Articles = new List<Article>() { new Article() { Title = "Article 1", HeadLine = "Headline 1" }, 
     new Article() { Title = "Article 2", HeadLine = "Headline 2"}, 
     new Article() { Title = "Article 3", HeadLine = "Headline 3"}}; 
     myFeeds.Add(feed1); 

     Feed feed2 = new Feed(); 
     feed2.Title = "Feed B"; 
     feed2.Articles = new List<Article>() { new Article() { Title = "Article 4", HeadLine = "Headline 4" } }; 
     myFeeds.Add(feed2); 

     Feed feed3 = new Feed(); 
     feed3.Title = "Feed C"; 
     feed3.Articles = new List<Article>() { new Article() { Title = "Article 5", HeadLine = "Headline 5" }, 
     new Article() { Title = "Article 6", HeadLine = "Headline 6"}}; 
     myFeeds.Add(feed3); 

     Feeds = myFeeds; 
    } 

    public ObservableCollection<Feed> Feeds 
    { 
     get { return this.feeds; } 
     set 
     { 
      Set<ObservableCollection<Feed>>(ref this.feeds, value); 
     } 
    } 
} 

public class Feed 
{ 
    public string Title { get; set; } 
    public List<Article> Articles { get; set; } 
} 

public class Article 
{ 
    public string Title { get; set; } 
    public string HeadLine { get; set; } 
} 

public abstract class BindableBase : INotifyPropertyChanged 
{ 
    public event PropertyChangedEventHandler PropertyChanged; 

    public virtual bool Set<T>(ref T storage, T value, [CallerMemberName]string propertyName = null) 
    { 
     if (object.Equals(storage, value)) 
      return false; 

     storage = value; 
     this.RaisePropertyChanged(propertyName); 
     return true; 
    } 

    public virtual void RaisePropertyChanged([CallerMemberName]string propertyName = null) 
    { 
     if (Windows.ApplicationModel.DesignMode.DesignModeEnabled) 
      return; 

     var handler = PropertyChanged; 
     if (!object.Equals(handler, null)) 
     { 
      var args = new PropertyChangedEventArgs(propertyName); 
      handler.Invoke(this, args); 

     } 
    } 
} 

Fügen Sie den folgenden in Ihre Ansicht Code-Behind:

protected async override void OnNavigatedTo(NavigationEventArgs e) 
{ 
    var viewModel = pivot.DataContext as ViewModel; 
    await viewModel.LoadFeeds(); 
} 

Und dann das XAML für die Pivot-Steuerung. Sie müssen HeaderTemplate und ItemTemplate angeben.

<Page 
    x:Class="PivotApp.MainPage" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="using:PivotApp" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" 
    Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"> 

    <Page.Resources> 
     <local:ViewModel x:Key="ViewModel" /> 
     <DataTemplate x:Key="headerTemplate"> 
      <TextBlock Text="{Binding Title}" /> 
     </DataTemplate> 
     <DataTemplate x:Key="pivotTemplate"> 
      <ListView Name="ListBox" ItemsSource="{Binding Articles}"> 
       <ListView.ItemTemplate> 
        <DataTemplate> 
         <StackPanel> 
          <TextBlock Text="{Binding Title}" /> 
          <TextBlock Text="{Binding HeadLine}"/> 
         </StackPanel> 
        </DataTemplate> 
       </ListView.ItemTemplate> 
      </ListView> 
     </DataTemplate> 
    </Page.Resources> 

    <Pivot DataContext="{StaticResource ViewModel}" x:Name="pivot" HeaderTemplate="{StaticResource headerTemplate}" ItemTemplate="{StaticResource pivotTemplate}" ItemsSource="{Binding Feeds}" > 
    </Pivot> 
</Page> 

Das Endergebnis ist: