如何在ControlTemplate中绑定ComboBox的ItemsSource？
如何在ControlTemplate中绑定ComboBox的ItemsSource？
提问于 2018-05-29 19:15:20
情况
我必须在GridView中更改Flyout项的内容。所以我在Page.Resources中创建ControlTemplate，并在Flyout中的ContentControl中设置它。
问题
我在ControlTemplate有一个ComboBox。现在我想将ComboBox的ItemsSource设置为List<string> (_easingType)，这是在MainPage中声明的
问题
如何在ControlTemplate中绑定/设置ComboBox的ItemsSource
代码
我删除了代码中不必要的部分。
XAML
<Page.Resources>
<ControlTemplate x:Key="BlurEditFlyout">
....
<ComboBox ItemsSource="{Bind it to the _esaingType}" />
....
<ControlTemplate x:Key="BlurEditFlyout">
</Page.Resources>
<GridView ItemsSource="{x:Bind _items}">
<GridView.ItemTemplate>
<DataTemplate x:DataType="local:MethodData">
<StackPanel>
....
<Button Visibility="{x:Bind EditButtonVisibility}">
<Button.Flyout>
<Flyout>
<Flyout.FlyoutPresenterStyle>
<Style TargetType="FlyoutPresenter">
<Setter Property="ScrollViewer.HorizontalScrollMode" Value="Disabled" />
<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />
</Style>
</Flyout.FlyoutPresenterStyle>
<ContentControl Template="{x:Bind FlyoutTemplate}"/>
</Flyout>
</Button.Flyout>
<SymbolIcon Symbol="Edit"/>
</Button>
....
</StackPanel>
</DataTemplate>
</GridView.ItemTemplate>
</GridView>背后的代码
public sealed partial class MainPage : Page
{
ObservableCollection<MethodData> _items = new ObservableCollection<MethodData>();
List<string> _easingType = new List<string>(Enum.GetNames(typeof(EasingType)).ToArray());
Dictionary<MethodName, ControlTemplate> _buttonFlyoutDictionary = new Dictionary<MethodName, ControlTemplate>();
public MainPage()
{
this.InitializeComponent();
LoadFlyoutResources();
_items.Add(GetMethodData(MethodName.Blur));
}
private void LoadFlyoutResources()
{
_buttonFlyoutDictionary.Add(MethodName.Blur, (ControlTemplate)Resources["BlurEditFlyout"]);
.....
}
private MethodData GetMethodData(MethodName methodName)
{
_buttonFlyoutDictionary.TryGetValue(methodName, out ControlTemplate flyoutTemplate);
return new MethodData(methodName, flyoutTemplate);
}
}
public class MethodData
{
public string Name { get; set; }
public ControlTemplate FlyoutTemplate { get; set; }
public Visibility EditButtonVisibility { get; set; }
public MethodData(MethodName name, ControlTemplate flyoutTemplate)
{
Name = name.ToString();
FlyoutTemplate = flyoutTemplate;
EditButtonVisibility = (name == MethodName.Then) ? Visibility.Collapsed : Visibility.Visible;
}
}
public enum MethodName
{
Blur,
....
}完整代码
回答 1
Stack Overflow用户
回答已采纳
发布于 2018-06-16 07:09:45
弹出控件中的DataContext实际上是"_items“中的每一项。您需要创建一个DataContext代理来访问页面的DataContext。您可以使用这两个链接中的任何一个来创建代理。
它的要点是，您需要创建一个可以作为静态资源引用的代理。按照第一个链接，您将执行以下操作：
public class DataContextProxy : FrameworkElement
{
public DataContextProxy()
{
this.Loaded += new RoutedEventHandler(DataContextProxy_Loaded);
}
void DataContextProxy_Loaded(object sender, RoutedEventArgs e)
{
Binding binding = new Binding();
if (!String.IsNullOrEmpty(BindingPropertyName))
{
binding.Path = new PropertyPath(BindingPropertyName);
}
binding.Source = this.DataContext;
binding.Mode = BindingMode;
this.SetBinding(DataContextProxy.DataSourceProperty, binding);
}
public Object DataSource
{
get { return (Object)GetValue(DataSourceProperty); }
set { SetValue(DataSourceProperty, value); }
}
public static readonly DependencyProperty DataSourceProperty =
DependencyProperty.Register("DataSource", typeof(Object), typeof(DataContextProxy), null);
public string BindingPropertyName { get; set; }
public BindingMode BindingMode { get; set; }
}您应该为_easingType使用public访问修饰符
public List<string> _easingType = new List<string>(Enum.GetNames(typeof(EasingType)).ToArray());在MainPage.xaml中
<Page.Resources>
<local:DataContextProxy x:Key="DataContextProxy" />
<ControlTemplate x:Key="BlurEditFlyout">
....
<ComboBox ItemsSource="{Binding Source={StaticResource DataContextProxy}, Path=DataSource._easingType}" />
....
<ControlTemplate x:Key="BlurEditFlyout">
</Page.Resources>
...页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/50582994
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