我正在使用MVVM模式構建應用程序。點擊其中一個元素後,我想查看此元素的詳細信息。我寫了這個:如何使用MVVM模式在LongListSelector中選擇一個項目?
XAML
<phone:LongListSelector ItemsSource="{Binding Data}"
Margin="0,0,0,158"
SelectedItem="{Binding SelectedItem}">
<phone:LongListSelector.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<Button>
<!-- Command="{Binding ShowDetailsAction}"-->
<Button.Template>
<ControlTemplate>
<TextBlock Text="{Binding Text}"></TextBlock>
</ControlTemplate>
</Button.Template>
</Button>
</StackPanel>
</DataTemplate>
</phone:LongListSelector.ItemTemplate>
</phone:LongListSelector>
視圖模型:
public IEnumerable SelectedItem
{
get { return _itemsControl; }
set
{
if (_itemsControl == value)
return;
_itemsControl = value;
// Test
_mss.ErrorNotification("fd");
}
}
我也嘗試使用命令,沒有工作了。
這是命令部分:
public ICommand ShowDetailsCommand { get; private set; }
public ViewModel()
{
_loadDataCommand = new DelegateCommand(LoadDataAction);
SaveChangesCommand = new DelegateCommand(SaveChangesAction);
ShowDetailsCommand = new DelegateCommand(ShowDetailsAction);
}
private void ShowDetailsAction(object p)
{
_mss.ErrorNotification("bla bla");
}
EDIT
視圖模型
private IEnumerable _itemsControl;
public IEnumerable Data
{
get
{
return _itemsControl;
}
set
{
_itemsControl = value;
RaisePropertyChanged("Data");
}
}
protected void RaisePropertyChanged(string propertyName)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler != null)
{
handler(this, new PropertyChangedEventArgs(propertyName));
}
}
模型
public string Text { get; set; }
public DateTimeOffset Data { get; set; }
EDIT2
private MobileServiceCollection<ModelAzure, ModelAzure> _items;
private readonly IMobileServiceTable<ModelAzure> _todoTable = App.MobileService.GetTable<ModelAzure>();
private async void RefreshTodoItems()
{
try
{
_items = await _todoTable.ToCollectionAsync();
}
catch (MobileServiceInvalidOperationException e)
{
_mss.ErrorNotification(e.ToString());
}
Data = _items;
}
您是否嘗試明確定義您在TwoWay模式下的SelectedItem綁定? (嘗試SelectedItem =「{綁定SelectedItem,模式= TwoWay}」) – AirL
我添加Mode = TwoWay,但不工作。 – Serafins
您能否提供更多的viewmodel代碼?查看Data屬性及其內容類型可能很有用。 – AirL