我一直在努力奋斗一天左右,无法弄清楚我在这里做错了什么。我希望能够在我的可观察选项卡集合中选择任何选项卡,并且我希望我的选择在UI中可见。我尝试过SelectedIndex和SelectedItem。我可以看到我的属性已设置但我的选项卡未被选中,UI中没有任何反应。这是我的代码:
MainWindow.xaml
<Window x:Class="WpfApplication5.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:uc="clr-namespace:WpfApplication5"
Title="MainWindow" Height="350" Width="525">
<Window.DataContext>
<ViewModel xmlns="clr-namespace:WpfApplication5" />
</Window.DataContext>
<StackPanel>
<Button Content="Select Tab Index 0" Click="Button_Click_0"/>
<Button Content="Select Tab Index 1" Click="Button_Click_1"/>
<Label Content="{Binding SelectedIndex, UpdateSourceTrigger=PropertyChanged}" />
<TabControl ItemsSource="{Binding Tabs}" SelectedIndex="{Binding SelectedIndex, UpdateSourceTrigger=PropertyChanged, Mode=TwoWay}">
<TabControl.ItemTemplate>
<DataTemplate>
<TextBlock Text="{Binding Header}"/>
</DataTemplate>
</TabControl.ItemTemplate>
<TabControl.ContentTemplate>
<DataTemplate>
<uc:TabContent Content="{Binding Content}"/>
</DataTemplate>
</TabControl.ContentTemplate>
</TabControl>
</StackPanel>
MainWindow.xaml.cs
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void Button_Click_0(object sender, RoutedEventArgs e)
{
var viewModel = (ViewModel)DataContext;
viewModel.SelectedIndex = 0;
}
private void Button_Click_1(object sender, RoutedEventArgs e)
{
var viewModel = (ViewModel)DataContext;
viewModel.SelectedIndex = 1;
}
}
ViewModel.cs
class ViewModel
{
private int _selectedIndex = 0;
public event PropertyChangedEventHandler PropertyChanged;
private ObservableCollection<Tab> _tabCollection = new ObservableCollection<Tab>();
public ViewModel()
{
Tabs.Add(new Tab { Header = "Tab1", Content = new WpfApplication5.TabContent() });
Tabs.Add(new Tab { Header = "Tab2", Content = new WpfApplication5.TabContent() });
}
public ObservableCollection<Tab> Tabs
{
get { return _tabCollection; }
}
public int SelectedIndex
{
get { return _selectedIndex; }
set
{
_selectedIndex = value;
NotifyPropertyChanged("SelectedIndex");
}
}
private void NotifyPropertyChanged(string propertyName)
{
if (PropertyChanged != null) PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
}
}
Tab.cs
class Tab
{
public UserControl Content { get; set; }
public string Header { get; set; }
}
TabContent.xaml
<Grid>
<Label Content="Hello World!" />
</Grid>
答案 0 :(得分:1)
您的ViewModel
课程没有实现INotifyPropertyChanged
界面:
class ViewModel : INotifyPropertyChanged
{
...
那是你的问题。