Get Data from ObjectDataProvider when combo box opens
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06-07-2019 - |
Question
How do I go about getting an ObjectDataProvider to get triggered each time a combo box is expanded instead of just one time?
<UserControl.Resources>
<ObjectDataProvider x:Key="possibleExpressionValues"
MethodName="GetWatchVariableNames"
ObjectType="{x:Type mu:UserInterfaceHelper}" IsInitialLoadEnabled="False">
</ObjectDataProvider>
</UserControl.Resources>
<Grid>
<ComboBox IsEditable="True" Text="{Binding ID}" ItemsSource="{Binding Source={StaticResource possibleExpressionValues}}" VerticalAlignment="Top" />
</Grid>
Solution
With ObjectDataProvider get triggered, do you mean you want a fresh UserInterfaceHelper object created?
In that case, hook up the DropDownOpened event of the combobox to following method.
private void ComboBox_DropDownOpened(object sender, EventArgs e)
{
ObjectDataProvider odp = Resources["possibleExpressionValues"] as ObjectDataProvider;
odp.ObjectType = null;
odp.ObjectInstance = new UserInterfaceHelper();
}
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