DataTemplate/DataBinding not working.
<DataTemplate DataType="{x:Type l:Angle}">
<StackPanel Orientation="Horizontal">
<TextBox Text="{Binding Degrees}"/>
<TextBox Text="{Binding Minutes}"/>
<TextBox Text="{Binding Seconds}"/>
</StackPanel>
</DataTemplate>
<StackPanel Grid.Row="0">
<TextBlock>Northern Latitude:</TextBlock>
<ContentPresenter Content="{Binding NorthernLatitude}" />
<TextBlock>Western Longitude:</TextBlock>
<ContentPresenter Content="{Binding WesternLongitude}" />
</StackPanel>
This DataTemplate displays Angle object perfectly, however: when I edit one of the Angle properties and that particular textbox loses focus there is no update of the bound object. Even when I specify UpdateSourceTrigger=LostFocus there is no update.
I'm suspecting that the ContentPresenter is bugging me... Any suggestions?
Yes it does:
public class Angle : INotifyPropertyChanged
{
private int _degrees;
public int Degrees
{
get { return _degrees; }
set { _degrees = value; OnPropertyChanged("Degrees"); }
}
private int _minutes;
public int Minutes
{
get { return _minutes; }
set { _minutes = value; OnPropertyChanged("Minutes"); }
}
private double _seconds;
public double Seconds
{
get { return _seconds; }
set { _seconds = value; OnPropertyChanged("Seconds"); }
}
public Angle(int degrees, int minutes, double seconds)
{
_degrees = degrees % 360 + minutes / 60 + Convert.ToInt32(seconds) / 3600;
_minutes = minutes % 60 + Convert.ToInt32(seconds) / 60;
_seconds = seconds % 60;
}
public double ToDouble()
{
return _degrees + _minutes / 60.0 + _seconds / 3600;
}
public double ToRadians()
{
return (this.ToDouble() / 360.0) * (2 * Math.PI);
}
public static Angle GreenwichNorthernLatitude = new Angle(51, 28, 0);
public static Angle GreenwichWesternLongitude = new Angle(0, 0, 0);
#region INotifyPropertyChanged Members
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string propertyName)
{
PropertyChangedEventHandler e = PropertyChanged;
if (e != null)
{
e(this, new PropertyChangedEventArgs(propertyName));
}
}
#endregion
}
}
Hmmm... solved it.
The Angles that I used in the Bindings are properties of a class called CalendarSettings. After propagation of the PropertyChanged event from Angle to CalendarSettings it worked.
Am I right in concluding that the Binding is NOT listening for changes of the property that it is bound to, but instead is listening for changes on the DataContext object?
