WPF ComboBox SelectedValueBinding

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I have a DataGrid with ComboBoxes. The data binding works fine with simple types but not with properties within types. Specifically:

<DataGrid ...>
...
<DataGridComboBoxColumn SelectedValueBinding="{Binding Path=TimeInterval.Start}" ....
<DataGridComboBoxColumn.ElementStyle>
<Style TargetType="ComboBox">
<Setter Property="ItemsSource Value="{Binding Path=data .....
<DataGridComboBoxColumn.EditingElementStyle>.......

Here

class Shift { .... public TimeInterval TimeInterval {get {...} set {...}} public int ShiftSize { get {...} set {..}}}

class TimeInterval { public double Start { get {...} set {...}}

This doesn't work. But if I change TimeInterval.Start to ShiftSize it works OK.

NOTE also that within a ListView,

XML

<TextBlock Text="{Binding Path=TimeInterval.Start ....

also works fine.

Any ideas?? Thanks!!

Posted 30-Sep-13 5:50am

Julio Kuplinsky

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Comments

Pheonyx 30-Sep-13 11:56am

I suspect the issue is because TimeInterval does not implement INotifyPropertyChanged, this is required so that if changes are made then the property updates and then informs the binding it's data has changed triggering a refresh.

The TextBlock binding is a read only binding, i.e. data is not being written back so there is no need for the change refresh to occur.

I could be wrong but I suspect your issue is something to do with this.

Julio Kuplinsky 30-Sep-13 14:39pm

Yes it does. I tried to keep my post simple. In fact I have

public TimeInterval TimeInterval
{
get
{
return timeInterval;
}
set
{
timeInterval = value;
if (PropertyChanged != null)
PropertyChanged(this, new PropertyChangedEventArgs("TimeInterval"));
}
}

Pheonyx 30-Sep-13 14:45pm

The TimeInterval property may do, but does the TimeInterval object implement it, e.g. its start setting etc).

Julio Kuplinsky 30-Sep-13 15:24pm

yes; like i say in my original post, it works with a listview/textblock

Marvin Ma 1-Oct-13 3:18am

It's not the solution to your Problem but a little tip:
You could source out the if-statement in a method, so you save some writing work.

E.g:
public void NotifyPropertyChanged(string propertyname)
{
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs(propertyname));
}
}

Then in your setter, you could just call NotifyPropertyChanged("YourProperty");

Julio Kuplinsky 1-Oct-13 12:11pm

thanks!

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