Question

我正在尝试构建一个简单的应用程序来显示API调用的结果。我似乎无法弄清楚如何将我的结果绑定到我的数据模板。

我在这个TestApp中寻找的行为是，当按下按钮时，列表视图会显示每个代表的名称，参与方和状态。

namespace TestApp
{        
    public class Reps
    {
        public Rep[] results { get; set; }
    }

    public class Rep
    {
        public string name { get; set; }
        public string party { get; set; }
        public string state { get; set; }
        public string district { get; set; }
        public string phone { get; set; }
        public string office { get; set; }
        public string link { get; set; }

        public Rep() { }

        public Rep(string name, string party, string state)
        {
            this.name = name;
            this.party = party;
            this.state = state;
        }
    }      
}

namespace TestApp
{    
    public sealed partial class MainPage : Page
    {
        public ObservableCollection<Rep> Representative = new ObservableCollection<Rep>();

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

        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
            listView1.DataContext = Representative;
        }

        private async void Button_Click(object sender, RoutedEventArgs e)
        {            
            var uri = new Uri("http://whoismyrepresentative.com/getall_mems.php?zip=31023&output=json");
            var request = WebRequest.CreateHttp(uri);
            request.Method = "GET";
            request.Accept = "application/json";
            var response = await request.GetResponseAsync();
            var stream = response.GetResponseStream();

            var deserializer = new DataContractJsonSerializer(typeof(Reps));

            Reps rps = (Reps)deserializer.ReadObject(stream);

            for (int i = 0; i < rps.results.Length; i++)
            {             
                Rep newRep = new Rep { name = rps.results[i].name.ToString(), 
                                       party = rps.results[i].party.ToString(), 
                                       state = rps.results[i].state.ToString() };
                Representative.Add(newRep);

                Debug.WriteLine(rps.results[i].name.ToString());
            }                      
        }
    }
}

<Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}">
    <Button Content="Button" 
            HorizontalAlignment="Left" 
            Margin="275,212,0,0" 
            VerticalAlignment="Top" 
            Click="Button_Click" />
        <Grid HorizontalAlignment="Left" 
              Height="293" 
              Margin="524,133,0,0" 
              VerticalAlignment="Top" 
              Width="399">             
            <ListView x:Name="listView1" ItemsSource="{Binding Representative}">
                <ListView.ItemTemplate>
                <DataTemplate>
                    <StackPanel>
                        <TextBlock Text="{Binding name}"
                               FontSize="20"
                               Foreground="White"/>
                            <TextBlock Text="{Binding party}"
                                       FontSize="20"
                                       Foreground="White"/>
                            <TextBlock Text="{Binding state}"
                                       FontSize="20"
                                       Foreground="White"/>
                    </StackPanel>
                </DataTemplate>
                </ListView.ItemTemplate>
            </ListView>
        </Grid>

Answer 1

设置ListView的DataContext仅设置绑定的上下文对象，但它本身不是绑定。因此，只需替换

行

listView1.DataContext = Representative;

与

listView1.ItemsSource = Representative;

无法将ObservableCollection绑定到DataTemplate

1 个答案: