WinRT：以编程方式设置DropDown列表来源

Question

我有一个DropDown列表和2个单选按钮。我需要更改每个按钮更改DD列表数据源。

XAML：

<Page 
    x:Class="myapp.MyTags" 
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
    xmlns:local="using:ReqWriter8" 
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" Loaded="Page_Loaded"> 
    <Page.Resources> 
    <CollectionViewSource x:Name="MyAxureHTML" Source="{Binding }"/> 
    <CollectionViewSource x:Name="MyControlTypeIDs" Source="{Binding }"/> 
    </Page.Resources> 

    <Grid Background="{StaticResource ApplicationPageBackgroundThemeBrush}"> 
    <Grid.ColumnDefinitions> 
     <ColumnDefinition Width="480*"/> 
     <ColumnDefinition Width="203*"/> 
    </Grid.ColumnDefinitions> 
    <!-- Back button and page title --> 
    <Grid x:Name="titlePanel" Background="Gray" Grid.ColumnSpan="2"> 
     <Grid.ColumnDefinitions> 
     <ColumnDefinition Width="120"/> 
     <ColumnDefinition Width="*"/> 
     </Grid.ColumnDefinitions> 
     <!--Command="{Binding NavigationHelper.GoBackCommand, ElementName=MainPage}"--> 
     <Button x:Name="backButton" Margin="39,59,0,0" 
         Style="{StaticResource BackButtonStyle}" 
         VerticalAlignment="Top" 
         AutomationProperties.Name="Back" 
         AutomationProperties.AutomationId="BackButton" 
         AutomationProperties.ItemType="Navigation Button" Width="71"/> 
     <TextBlock x:Name="pageTitle" Text="Setup Requirement Statements" Style="{StaticResource HeaderTextStyle}" Grid.Column="1" 
         IsHitTestVisible="false" TextWrapping="NoWrap" VerticalAlignment="Top" Margin="2,63,-2,0"/> 
    </Grid> 

    <RadioButton x:Name="btA" Content="Axure HTML" HorizontalAlignment="Left" Margin="353,184,0,0" VerticalAlignment="Top"/> 
    <RadioButton x:Name="btB" Content="Balsamiq XML" HorizontalAlignment="Left" Margin="542,184,0,0" VerticalAlignment="Top"/> 
    <ComboBox x:Name="cbWidget" HorizontalAlignment="Left" Margin="356,297,0,0" VerticalAlignment="Top" Width="307" MaxDropDownHeight="15"/> 


    </Grid> 
</Page> 

代码：

Private Sub Init() 
    Dim dbpath = Path.Combine(Windows.Storage.ApplicationData.Current.LocalFolder.Path, App.DB) 
    Using db = New SQLiteConnection(dbpath) 

     tblAxureHTML = From T In db.Table(Of AxureHTML)() 
         Where T.ClassName IsNot Nothing 
         Select T 
     tblControlTypeIDs = From T In db.Table(Of ControlTypeIDs)() 
         Where T.Name IsNot Nothing 
         Select T 


     MyAxureHTML.Source = tblAxureHTML 
     MyControlTypeIDs.Source = tblControlTypeIDs 

     db.Dispose() 
     db.Close() 

    End Using 
    cbWidget.ItemsSource = MyAxureHTML 
    End Sub 

DB：SQLite的

首先，我不知道我怎么设置下拉listt的来源。其次，需要在单选按钮选择上进行更改。

任何想法？

Answer 1

要触发列表的加载可以为Checked事件的RadioButton S寄存器：

<RadioButton x:Name="fruitsChoiceInput" Checked="RadioButton_Checked">Fruits</RadioButton> 
<RadioButton x:Name="vegetablesChoiceInput" Checked="RadioButton_Checked">Vegetables</RadioButton> 
<ComboBox x:Name="listOutput"></ComboBox> 

要设置列表中，您可以使用ComboBox的ItemsSource属性：

private static readonly string[] fruits = { "Apple", "Banana", "Kiwi" }; 
private static readonly string[] vegetables = { "Carrot", "Potato", "Tomato" }; 

private void RadioButton_Checked(object sender, RoutedEventArgs e) 
{ 
    listOutput.ItemsSource = fruitsChoiceInput.IsChecked == true ? fruits : 
     vegetablesChoiceInput.IsChecked == true ? vegetables : 
     null; 
}