[英]C#/WPF: ListView not updating (but when I check with Snoop, everything looks fine)
Does anyone know why my ListView with following Code is not working? 有谁知道为什么我的带有以下代码的ListView无法正常工作? I checked it out with Snoop and the ItemsSource seems to be fine (and when I start Snoop, the ListView displays me the MyViewModel.MyCollection, but when debugging with Visual Studio it shows me nothing?)
我用Snoop进行了检查,ItemsSource看起来还不错(当我启动Snoop时,ListView向我显示MyViewModel.MyCollection,但是在使用Visual Studio进行调试时却什么也没显示?)
Thank you! 谢谢!
PS: MainWindow.xaml.cs has the DataContext = MainViewModel PS:MainWindow.xaml.cs具有DataContext = MainViewModel
<ListView Grid.Row="1" Margin="38,50,0,168" HorizontalAlignment="Left" Name="listViewSelectDate" Width="105"
ItemsSource="{Binding Path=MyViewModel.MyCollection}"
SelectedItem="{Binding SelectedDate}" IsSynchronizedWithCurrentItem="True">
<ListView.View>
<GridView>
<GridViewColumn Header="Date" DisplayMemberBinding="{Binding Path=CalcDate}"/>
</GridView>
</ListView.View>
</ListView>
The ViewModel looks like this: ViewModel看起来像这样:
class MainViewModel : ViewModelBase
{
public SummaryViewModel MyViewModel
{
get { return _myViewModel; }
set { _myViewModel = value; RaisePropertyChanged("MyViewModel"); }
}
public MyDate SelectedDate
{
get { return _selectedDate; }
set { _selectedDate = value; RaisePropertyChanged("SelectedDate"); }
}
}
and 和
public class SummaryViewModel : ViewModelBase
{
public ObservableCollection<MyDate> MyCollection { get; set; }
}
and 和
public class MyDate
{
public DateTime CalcDate { get; set; }
}
Who sets MyCollection
? 谁设置
MyCollection
? It is not providing change notification, so the binding doesn't know that it has been changed. 它不提供更改通知,因此绑定不知道它已更改。 Change to:
改成:
private ObservableCollection<MyDate> _myCollection;
public ObservableCollection<MyDate> MyCollection
{
get { return _myCollection; }
set
{
_myCollection = value;
OnPropertyChanged("MyCollection");
}
}
Or, even better, make it read-only: 或者,甚至更好,将其设置为只读:
private readonly ICollection<MyDate> _myCollection = new ObservableCollection<MyDate>();
public ICollection<MyDate> MyCollection
{
get { return _myCollection; }
}
在“ Visual Studio输出”窗口中查找,它将显示您可能遇到的任何DataBinding错误,这可能有助于您解决问题。
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