我在我的Xaml中有一个转轴控件:
<controls:Pivot ItemsSource="{Binding ObjectList}">
<controls:Pivot.HeaderTemplate>
<DataTemplate>
<TextBlock />
</DataTemplate>
</controls:Pivot.HeaderTemplate>
<controls:Pivot.ItemTemplate>
<DataTemplate>
<StackPanel>
<TextBlock Text="{Binding Value1}" />
<TextBlock Text="{Binding Value2}" />
</StackPanel>
</DataTemplate>
</controls:Pivot.ItemTemplate>
</controls:Pivot>
我的ViewModel是:
public class MyObject
{
public string Value1 { get; set; }
public string Value2 { get; set; }
}
public class MyViewModel : ViewModelBase
{
public const string ObjectListPropertyName = "ObjectList";
private ObservableCollection<MyObject> _objectList;
public ObservableCollection<MyObject> ObjectList
{
get
{
return _objectList;
}
private set
{
if (_objectList == value)
return;
_objectList = value;
RaisePropertyChanged(ObjectListPropertyName);
}
}
private DispatcherTimer timer;
public MyViewModel()
{
ObservableCollection<MyObject> collection = new ObservableCollection<MyObject>
{
new MyObject {Value1 = "One"},
new MyObject {Value1 = "Two"},
new MyObject {Value1 = "Tree"}
};
ObjectList = collection;
timer = new DispatcherTimer { Interval = TimeSpan.FromSeconds(2)};
timer.Tick += timer_Tick;
timer.Start();
}
void timer_Tick(object sender, EventArgs e)
{
foreach (MyObject myObject in _objectList)
{
myObject.Value2 = "Something";
}
Application.Current.RootVisual.Dispatcher.BeginInvoke( () => RaisePropertyChanged(ObjectListPropertyName));
}
}
当达到timer_tick时,我认为枢轴控制用新值刷新......但我看不到任何变化。
我想念什么?
提前感谢您的帮助
答案 0 :(得分:2)
我猜测可能更新列表成员而不更新列表本身就是问题所在。当您举起属性更改事件时 - 它适用于整个集合。尽管成员已经改变,但该集合仍然指向自己的平等参考。
尝试在setter中放置一个断点,看看是否触发了属性更改事件。