Question

在Silverlight中，我正在为ObservableCollection中的每个项创建一个按钮。我添加了一个ICommand来处理具有ObservableCollection的对象。在XAML中，如何从其中一个集合项中恢复此操作？

LayoutRoot.DataContext设置为以下类的实例：

public class MainViewModel
{
    public ICommand TestCommand { get; protected set; }

    public ObservableCollection<string> Test { get; protected set; }    

    public MainViewModel()
    {
        Test = new ObservableCollection<string>();
        Test.Add("Hello");
        TestCommand = new DelegateCommand(Test, CanTest);
    }

    private void Test(object parameter)
    {
        Test.Add("Test text");
    }

    private bool CanTest(object parameter)
    {
        return true;
    }
}

并将其与此XAML一起使用：

<StackPanel x:Name="LayoutRoot" Background="White">
    <ItemsControl ItemsSource="{Binding Test}" />

    <Button Command="{Binding TestCommand}">Push Me</Button> <!-- I can access TestCommand when I bind to it here -->

    <ItemsControl ItemsSource="{Binding Test}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <Button Content="{Binding}" 
                        Command="{Binding Path=TestCommand, Source=?????}" <!-- But how do I get back to the TestCommand from here? -->
                        CommandParameter="{Binding}" />
            </DataTemplate>
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</StackPanel>

Answer 1

您可以绑定到根元素的名称

<Button Command={Binding Path=DataContext.TestCommand, ElementName=LayoutRoot}" />

如何在Silverlight中的树上进一步数据绑定到DataContext？

1 个答案: