How do you access / databind a Global ObservableCollection<> in XAML

[Sevententh]

Hi all, I'm not sure that the heading is right, but I'll explain the problem and hopefully somebody can point me in the right direction. And I know this is slightly long but I'm trying to give lots of info. Note: I'm using the MVVM concept I have a class ComboLookupViewModel which contains a few public ObservableCollections i.e List of Time Zones and Currencies.

public class ComboLookupViewModel
{
private ObservableCollection<tblCfgTimeZones> currentTimeZone = new ObservableCollection<tblCfgTimeZones>();

    public ComboLookupViewModel()
    {
        GetList\_TimeZones();
    }

    public ObservableCollection<tblCfgTimeZones> CurrentTimeZone
    {
        get { return currentTimeZone; }
        set { currentTimeZone = value; }
    }

    private void GetList\_TimeZones()
    {
        currentTimeZone = new ObservableCollection<tblCfgTimeZones>(svc.FindTimeZoneList());
    }
}

In the code behind of App class I have:

public partial class App : Application
{
public static ComboLookupViewModel comboboxLookups = new ComboLookupViewModel();
}

This all works fine and the data is loaded. But I would like to view this list. Question: How do you do this, as the following databinding does not display anything (within a UserControl)?

<ListView x:Name="lstTimeZones"
ItemsSource="{Binding Path=App.comboboxLookups.CurrentTimeZone}"
ScrollViewer.CanContentScroll="True"
SelectionMode="Single"
SelectionChanged="lstTimeZones_SelectionChanged"
Background="Transparent" BorderBrush="Transparent">
<ListView.View>
<GridView>
<GridViewColumn Header="UTC Name" Width="120" DisplayMemberBinding="{Binding Path=UTCName}"/>
<GridViewColumn Header="UTC Value" Width="120" DisplayMemberBinding="{Binding Path=UTCValue}"/>
</GridView>
</ListView.View>
</ListView>

Currently my work around is to use another ObservableCollection in the ViewModel for the UserControl

public class TimeZoneViewModel
{
public ObservableCollection<tblCfgTimeZones> listTimeZone = new ObservableCollection<tblCfgTimeZones>();

    public TimeZoneViewModel()
    {
        listTimeZone = new ObservableCollection<tblCfgTimeZones>(App.combobo

[ABitSmart]

Have a look at this Binding to global App properties article[^] by Sacha Barber.

[Sevententh]

Thanks... this is very close to what I needed :-D

[Sevententh]

Worked it out... for those that would like to know

public partial class App : Application
{
private static ComboLookupViewModel comboLookups = new ComboLookupViewModel();

    public static ComboLookupViewModel ComboBoxLookups
    {
        get { return comboLookups; }
     }
}

            <ListView x:Name="lstTimeZones" 
                      **ItemsSource="{Binding Path=ComboBoxLookups.CurrentTimeZone, Source={x:Static Application.Current}}"**
                      ScrollViewer.CanContentScroll="True"
                      SelectionMode="Single" 
                      SelectionChanged="lstTimeZones\_SelectionChanged"
                      Background="Transparent" BorderBrush="Transparent">
                <ListView.View>
                    <GridView>
                        <GridViewColumn Header="UTC Name" Width="120" DisplayMemberBinding="{Binding Path=UTCName}"/>
                        <GridViewColumn Header="UTC Value" Width="120" DisplayMemberBinding="{Binding Path=UTCValue}"/>
                    </GridView>
                </ListView.View>
            </ListView>

I now have ObservableCollections<> in my class that are updated via CRUD and changes shown when reference on another UserControl :cool: