在WPF/.NET 3.5中开发自定义控件时，存在一个严重的问题。
详细信息
1.当我在同一窗口中添加两个实例时，似乎第二个实例总会有第一个实例的依赖属性值，即使test2只是被构造而没有应用模板(e.g: tes2.TopItems/CenterItems/BottomItems和tes1的一样，包括Count、Items等)。
2.当我删除其中任何一个时，问题就解决了。
3.TopItems/CenterItems/BottomItems是在OnApplyTemplate()中初始化的。
4.更改"Calendar"和"CalendarViewType"属性会调用PropertyChangedCallBack()。
5."TopItems"、"CenterItems"、"BttomItems"在控件的模板中使用{TemplateBinding}。
6.我尝试使用"普通属性"“{Binding RelativeSource=TemplatedParent}”代替"依赖属性"和{TemplateBinding}，它正常工作！多么奇怪！
请问，有人能帮忙吗？非常感谢！
类窗口
<Window>
<Grid>
<common:CalendarTitle x:Name="test1" Calendar="{Binding Calendar}" CalendarViewType="Month_Week"></common:CalendarTitle>
<common:CalendarTitle x:Name="test2" Calendar="{Binding Calendar}"></common:CalendarTitle>
</Grid>
</Window>
班级日历瓷砖控件：Control
public static readonly DependencyProperty CalendarProperty = DependencyProperty.Register("Calendar", typeof(ICalendar), typeof(CalendarTitle), new FrameworkPropertyMetadata(null, FrameworkPropertyMetadataOptions.AffectsRender, PropertyChangedCallback));
public static readonly DependencyProperty CalendarViewTypeProperty = DependencyProperty.Register("CalendarViewType", typeof(CalendarViewType), typeof(CalendarTitle), new FrameworkPropertyMetadata(CalendarViewType.Week_Day, FrameworkPropertyMetadataOptions.AffectsRender, PropertyChangedCallback));
public static readonly DependencyProperty TopItemsProperty = DependencyProperty.Register("TopItems", typeof(IEnumerable<ICalendarItem>), typeof(CalendarTitle), new FrameworkPropertyMetadata(new ObservableCollection<ICalendarItem>()));
public static readonly DependencyProperty CenterItemsProperty = DependencyProperty.Register("CenterItems", typeof(IEnumerable<ICalendarItem>), typeof(CalendarTitle), new FrameworkPropertyMetadata(new ObservableCollection<ICalendarItem>()));
public static readonly DependencyProperty BottomItemsProperty = DependencyProperty.Register("BottomItems", typeof(IEnumerable<ICalendarItem>), typeof(CalendarTitle), new FrameworkPropertyMetadata(new ObservableCollection<ICalendarItem>()));
public IEnumerable<ICalendarItem> TopItems
{
get { return (IEnumerable<ICalendarItem>)GetValue(TopItemsProperty); }
set { SetValue(TopItemsProperty, value); }
}
public IEnumerable<ICalendarItem> CenterItems
{
get { return (IEnumerable<ICalendarItem>)GetValue(CenterItemsProperty); }
set { SetValue(CenterItemsProperty, value); }
}
public IEnumerable<ICalendarItem> BottomItems
{
get { return (IEnumerable<ICalendarItem>)GetValue(BottomItemsProperty); }
set { SetValue(BottomItemsProperty, value); }
}
PropertyCallBack()
static void PropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
var calendarTile = (CalendarTitle)d;
calendarTile.isLoaded = false;
calendarTile.OnApplyTemplate();
}
OnApplyTemplate()
public override void OnApplyTemplate()
{
if (!isLoaded)
{
ClearItems();
if (Calendar != null)
PopulateItems();
isLoaded = true;
}
}
PopulateItems()
private void PopulateItems()
{
switch (CalendarViewType)
{
case CalendarViewType.Week_Day:
{
foreach (var item in Calendar.Items)
{
if (item.Date.DayOfWeek == DayOfWeek.Sunday)
(TopItems as IList<ICalendarItem>).Add(item);
}
CenterItems = BottomItems = Calendar.Items;
break;
}
case CalendarViewType.Month_Week:
{
foreach (var item in Calendar.Items)
{
if (item.Date.DayOfYear == 1)
(TopItems as IList<ICalendarItem>).Add(item);
if (item.Date.Day == 1)
(CenterItems as IList<ICalendarItem>).Add(item);
if (item.Date.DayOfWeek == DayOfWeek.Monday)
(BottomItems as IList<ICalendarItem>).Add(item);
}
break;
}
case CalendarViewType.Year_Month:
{
foreach (var item in Calendar.Items)
{
if (item.Date.DayOfYear == 1)
(TopItems as IList<ICalendarItem>).Add(item);
if (item.Date.Day == 1)
(CenterItems as IList<ICalendarItem>).Add(item);
if (item.Date.DayOfWeek == DayOfWeek.Monday)
(BottomItems as IList<ICalendarItem>).Add(item);
}
break;
}
}
}
OnApplyTemplate()不会操作任何依赖属性。PopulateItems()的内容是什么？实际输出与您的预期有何不同？ - Nuffin