I want to stop the ComboBox_SelectionChanged event from being fired at the UI loading. It should happen only when the user makes some change in the combo box.
To do this, I have written the following in .xam.cs file.
private void myComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
ComboBox cb = (ComboBox)sender;
if (!cb.IsFocused)
{
return;
}
else
ViewModel.OnPropertyChanged("MyProperty");
}
But this does not even fire the event when the user makes the change. Where have I gone wrong ?
I know there is a similar question in stackoverflow. But the solutions in it did not work for me. pls help.
found the solution. we just need to combine the Selection_Changed event with PreviewMouseDown event.
could the SelectionChanged event in WPF be handled only for user interaction?
This is an example XAML:
<av:ComboBox x:Name="cmbChargeUnit" HorizontalAlignment="Left" Margin="548,15,0,0" Width="187" ItemsSource="{av:Binding ChargeUnits}" DisplayMemberPath="ChargeUnitDescription" SelectedValue="{Binding SelectedChargeUnit}" VerticalAlignment="Top" Background="#FFCBCBCB" Height="20" IsSynchronizedWithCurrentItem="True" SelectedIndex="0" BorderBrush="#FF7070CB"/>
VM:
public ChargeUnit SelectedChargeUnit
{
get { return _selectedChargeUnit; }
set
{
_selectedChargeUnit = value;
OnPropertyChanged("SelectedChargeUnit");
if (SelectedAttributeId != null)//Only Load when an attribute is entered
{
LoadRates();
}
}
}
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.