从列表框中获取所选项目

我正在创建使用诺基亚Mix Radio SDK的Windows Phone 8应用程序。我有Listbox包含流派。 ListBox中的每个项目（流派）都有CheckBox，因此用户只能选择他想要收听的项目。我如何知道用户选择了哪些流派？从列表框中获取所选项目

这是我的XAML：

<phone:PhoneApplicationPage 
x:Class="MusicApp.GenrePage" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" 
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" 
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
FontFamily="{StaticResource PhoneFontFamilyNormal}" 
FontSize="{StaticResource PhoneFontSizeNormal}" 
Foreground="{StaticResource PhoneForegroundBrush}" 
SupportedOrientations="Portrait" Orientation="Portrait" 
mc:Ignorable="d" 
shell:SystemTray.IsVisible="True"> 

<!--LayoutRoot is the root grid where all page content is placed--> 
<Grid x:Name="LayoutRoot" Background="Transparent"> 
    <Grid.RowDefinitions> 
     <RowDefinition Height="Auto"/> 
     <RowDefinition Height="*"/> 
    </Grid.RowDefinitions> 

    <!--TitlePanel contains the name of the application and page title--> 
    <StackPanel Grid.Row="0" Margin="12,17,0,28"> 
     <TextBlock Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}"/> 
     <TextBlock Text="page name" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/> 
    </StackPanel> 

    <!--ContentPanel - place additional content here--> 
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> 
     <Grid.RowDefinitions> 
      <RowDefinition Height="*"/> 
      <RowDefinition Height="Auto"/> 
     </Grid.RowDefinitions> 
     <ListBox x:Name="GenresListBox" Grid.Row="0" > 
      <ListBox.ItemTemplate> 
       <DataTemplate> 
        <CheckBox Content="{Binding Name}" HorizontalAlignment="Left" VerticalAlignment="Top"/> 
       </DataTemplate> 
      </ListBox.ItemTemplate> 
     </ListBox> 
     <Button Grid.Row="1" Content="Button" HorizontalAlignment="Left" Name="SelectButton" VerticalAlignment="Top" Click="SelectButton_Click"/> 

    </Grid> 

</Grid>

这里是我的代码：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Navigation; 
using Microsoft.Phone.Controls; 
using Microsoft.Phone.Shell; 

namespace MusicApp 
{ 
    public partial class GenrePage : PhoneApplicationPage 
    { 
     public GenrePage() 
     { 
      InitializeComponent(); 


     } 

     private async void GetGenres() 
     { 
      var genres = await App.GetClient().GetGenresAsync(); 


      GenresListBox.ItemsSource = genres; 

      if (genres.Result == null || genres.Count == 0) 
      { 
       MessageBox.Show("No results available"); 
      } 

     } 

     protected override void OnNavigatedTo(NavigationEventArgs e) 
     { 
      base.OnNavigatedTo(e); 

      GetGenres(); 
     } 

     private void SelectButton_Click(object sender, RoutedEventArgs e) 
     { 
      var selectedGenres = GenresListBox.SelectedItems; 


     } 
    } 
}

来源

2014-03-04 Nurzhan Aitbayev

绑定器isChecked到模型中的一个属性，之后您可以通过列表迭代，看看哪一个被选中。看看这个http://stackoverflow.com/a/22137726/1664356 –

我使用Windows Phone Toolkit's LongListMultiSelector解决我的问题。

这是怎么回事的样子： enter image description here

现在我的XAML是：

<phone:PhoneApplicationPage 
x:Class="MusicApp.GenrePage" 
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone" 
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone" 
xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
xmlns:toolkit="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls.Toolkit" 
FontFamily="{StaticResource PhoneFontFamilyNormal}" 
FontSize="{StaticResource PhoneFontSizeNormal}" 
Foreground="{StaticResource PhoneForegroundBrush}" 
SupportedOrientations="Portrait" Orientation="Portrait" 
mc:Ignorable="d" 
shell:SystemTray.IsVisible="True"> 

<!--LayoutRoot is the root grid where all page content is placed--> 
<Grid x:Name="LayoutRoot" Background="Transparent"> 
    <Grid.RowDefinitions> 
     <RowDefinition Height="Auto"/> 
     <RowDefinition Height="*"/> 
    </Grid.RowDefinitions> 

    <!--TitlePanel contains the name of the application and page title--> 
    <StackPanel Grid.Row="0" Margin="12,17,0,28"> 
     <TextBlock Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}"/> 
     <TextBlock Text="page name" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/> 
    </StackPanel> 

    <!--ContentPanel - place additional content here--> 
    <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> 
     <Grid.RowDefinitions> 
      <RowDefinition Height="*"/> 
      <RowDefinition Height="Auto"/> 
     </Grid.RowDefinitions> 
     <toolkit:LongListMultiSelector x:Name="GenresListBox" Grid.Row="0" > 
      <toolkit:LongListMultiSelector.ItemTemplate> 
       <DataTemplate> 
        <TextBlock Text="{Binding Name}" /> 
       </DataTemplate> 
      </toolkit:LongListMultiSelector.ItemTemplate> 
     </toolkit:LongListMultiSelector> 
     <Button Grid.Row="1" Content="Button" HorizontalAlignment="Left" Name="SelectButton" VerticalAlignment="Top" Click="SelectButton_Click"/> 

    </Grid> 

</Grid>

和代码：

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Net; 
using System.Windows; 
using System.Windows.Controls; 
using System.Windows.Navigation; 
using Microsoft.Phone.Controls; 
using Microsoft.Phone.Shell; 
using Nokia.Music.Types; 

namespace MusicApp 
{ 
    public partial class GenrePage : PhoneApplicationPage 
    { 
     public GenrePage() 
     { 
      InitializeComponent(); 


     } 

     private async void GetGenres() 
     { 
      var genres = await App.GetClient().GetGenresAsync(); 


      GenresListBox.ItemsSource = genres; 

      if (genres.Result == null || genres.Count == 0) 
      { 
       MessageBox.Show("No results available"); 
      } 

     } 

     protected override void OnNavigatedTo(NavigationEventArgs e) 
     { 
      base.OnNavigatedTo(e); 

      GetGenres(); 
     } 

     private void SelectButton_Click(object sender, RoutedEventArgs e) 
     { 
      var genres = GenresListBox.SelectedItems; 

     } 
    } 
}

来源

2014-03-04 05:39:53

我做一点变化你的代码。试试这个它帮助你 XAML

<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"> 
     <Grid.RowDefinitions> 
     <RowDefinition Height="*"/> 
     <RowDefinition Height="Auto"/> 
     </Grid.RowDefinitions> 
    <ListBox x:Name="GenresListBox" Grid.Row="0" SelectionChanged ="GenresListBox_SelectionChanged"> 
     <ListBox.ItemTemplate> 
     <DataTemplate> 
      <CheckBox Content="{Binding Name}" HorizontalAlignment="Left" VerticalAlignment="Top"/> 
      </DataTemplate> 
     </ListBox.ItemTemplate> 
</ListBox> 
<Button Grid.Row="1" Content="Button" HorizontalAlignment="Left" Name="SelectButton" VerticalAlignment="Top" Click="SelectButton_Click"/>  
</Grid>

代码Beind

private void GenresListBox_SelectionChanged(object sender, SelectionChangedEventArgs e) 
{ 
if (GenresListBox.SelectedIndex == -1) 
     return; 
} 

private void SelectButton_Click(object sender, RoutedEventArgs e) 
     { 
      var selectedGenres = GenresListBox.SelectedItem; 
     }

来源

2014-03-04 06:00:27 Jaihind

从列表框中获取所选项目

回答

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