[英]WPF Binding not Updating in DataGrid (with grouping)
我知道有很多关于绑定问题的问题。 但我还没有找到任何解决方案——我也不知道我的代码有什么问题。
我有 2 Collections:
public ObservableCollection<TicketEntry> AllEntries {get; set;}
public ObservableCollection<TicketEntry> Entries {get; set;}
Entity
有一个属性IsFavourite
:
private bool _isFavourite = false;
public bool IsFavourite
{
get { return _isFavourite; }
set
{
_isFavourite = value;
OnPropertyChanged();
OnPropertyChanged("ImageSource");
}
string ImageSource
{
get
{
if (IsFavourite)
{
return "pack://application:,,,/Resources/star_true.png";
}
else
{
return "pack://application:,,,/Resources/star_false.png";
}
}
}
<CollectionViewSource x:Key="Collection"
Source="{Binding Entries,
UpdateSourceTrigger=PropertyChanged,
Mode=TwoWay,
NotifyOnSourceUpdated=True}"
xmlns:s="clr-namespace:System;assembly=mscorlib">
<CollectionViewSource.GroupDescriptions>
<PropertyGroupDescription PropertyName="IsFavourite" />
</CollectionViewSource.GroupDescriptions>
<CollectionViewSource.LiveGroupingProperties>
<s:String>IsFavourite</s:String>
</CollectionViewSource.LiveGroupingProperties>
</CollectionViewSource>
//Handler for Command ((un)set-favourite)
private void HandleInvertFavourite()
{
if (IsFavourite)
{
IsFavourite = false;
}
else
{
IsFavourite = true;
}
AllTicketsViewModel.Instance.InvokeFavouritesChanged(this);
}
internal void InvokeFavouritesChanged(TicketEntry ticketEntry)
{
if(ticketEntry.IsFavourite) // Add
{
if(CurrentWeekViewModel.Instance.Entries.Any(x => x.TicketId == ticketEntry.TicketId)) // already exists
{
TicketEntry existingentry = CurrentWeekViewModel.Instance.Entries.First(x => x.TicketId == ticketEntry.TicketId);
CurrentWeekViewModel.Instance.Entries.First(x => x.TicketId == ticketEntry.TicketId).IsFavourite = true;
}
else
{
CurrentWeekViewModel.Instance.Entries.Add(ticketEntry);
}
}
else // Remove
{
if(CurrentWeekViewModel.Instance.Entries.Any(x => x.TicketId == timeTicketEntry.TicketId))
{
TicketEntry existingentry = CurrentWeekViewModel.Instance.Entries.First(x => x.TicketId == ticketEntry.TicketId);
if (existingentry.TimeBookings.Any(x => x.Date > CurrentWeekViewModel.Instance.SelectedWeek.FirstDay &&
x.Date < CurrentWeekViewModel.Instance.SelectedWeek.LastDay &&
existingentry.IsFavourite))
//has time data for actual week => keep but set fav = false
{
existingentry.IsFavourite = false;
}
else // completely remove
{
CurrentWeekViewModel.Instance.Entries.Remove(existingentry);
}
}
}
}
此外, CurrentWeek
-DataGird 在IsFavourite
上有Grouping
- 我希望现有条目在IsFavourite_Changed
上切换组。
我检查过的事情:
为什么当属性改变时分组没有改变?
将CollectionViewSource
的IsLiveGroupingRequested
属性设置为true
。
尝试刷新组
ICollectionView groupedList = CollectionViewSource.GetDefaultView(items);
groupedList.Refresh();
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