将 WPF 用户控件选择传递给宿主控件 [英] Passing WPF user control selection to host control

问题描述

我有一个带有列表框的 WPF 用户控件.我想通过绑定将列表框中的选定项传递给调用控件.我怎样才能做到这一点?

I have a WPF user control with a list box. I want to pass the selected item in the list box to the calling control through binding. How can I achieve this?

推荐答案

您可以在用户控件上为 SelectedItem 公开一个新属性，并将其绑定到子控件 ListBox.

You can expose a new property for SelectedItem on your user control and bind it to the child control ListBox.

您的用户控件的代码(虽然我是从 Control 继承的):

Code for your user control (I inherited from Control though):

public class CustomListControl : Control
{
    static CustomListControl()
    {
        DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomListControl), new FrameworkPropertyMetadata(typeof(CustomListControl)));

        SelectedItemProperty = ListBox.SelectedItemProperty.AddOwner(typeof(CustomListControl));
    }

    public static readonly DependencyProperty SelectedItemProperty;

    public Object SelectedItem
    {
        get { return this.GetValue(SelectedItemProperty); }
        set { this.SetValue(SelectedItemProperty, value); }
    }
}

并将来自内部 ListBox 的绑定添加到 Generic.xaml 标记中的 UserControl:

And add the binding from the inner ListBox to your UserControl in the Generic.xaml markup:

<ListBox
    SelectedItem="{Binding RelativeSource={RelativeSource AncestorLevel=1, AncestorType={x:Type local:CustomListControl},Mode=FindAncestor},Path=SelectedItem, Mode=TwoWay}"
</ListBox>

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