Question

我有一个包含用户ListView的页面：

<ListView ItemsSource="{Binding UserList}"
          SelectedItem="{Binding SelectedUser}">
    <GridView>
        <GridViewColumn DisplayMemberBinding="{Binding Id}" />
        <GridViewColumn DisplayMemberBinding="{Binding Name}"/>
    </GridVie>
</ListView>

我还有一个用户控件，它将显示该ListView中所选用户的所有数据。因此，我将SelectedUser绑定到CurrentUser

的依赖项属性UserUc

<userControls:UserUc CurrentUser="{Binding SelectedUser}" />

用户控件不显示数据！为什么？

Edit

我将此添加到页面后面的代码中：

public static readonly DependencyProperty SelectedUserProperty = WpfDpHelper.Register<UserListUc, User>(i => i.SelectedUser, Callback);

private static void Callback(UserListUc userListUc, DependencyPropertyChangedEventArgs<User> DependencyPropertyChangedEventArgs)
{
    Debug.WriteLine("user selection changed");
}

当我更改任何用户的选择时，设置者被解雇

Second edit：用户控件

<UserControl ...
             DataContext="{Binding RelativeSource={RelativeSource Self}}">
    <ListView ItemsSource="{Binding CurrentUser.CommentList}">
        <!-- I want to show the user comments -->
    </ListView>
</UserControl>

Code behind

public static readonly DependencyProperty CurrentUserProperty = WpfDpHelper.Register<UserUc, User>(i => i.CurrentUser);
public User CurrentUser
{
    get { return (User) GetValue(CurrentUserProperty); }
    set { SetValue(CurrentUserProperty, value); }
}

Answer 1

如果你将usercontrol中的datacontext设置为self - 那就错了。请使用ElementName绑定。所以你要做的就是删除你的DataContext =“{Binding RelativeSource = {RelativeSource Self}}”

 <UserControl x:Name="uc">
   <ListView ItemsSource="{Binding ElementName=uc,CurrentUser.CommentList}">
    <!-- I want to show the user comments -->
   </ListView>

将ListView选定项绑定到用户控件

1 个答案: