WPF Shared DataContext / Binding

Question

I have an issue with my binding in WPF currently. I have a two-tabbed application. The first tab contains a datagrid control that is populated by a list. The second tab contains a listbox control that is populated by a list. The problem is if I run the check on the first tab and it returns for example 5 rows in the datagrid, the second tab will populate 5 dummy listbox items. So the controls are evidently sharing the some context, but I'm unsure how to correct that.

XAML for first tab showing binding:

Code for first tab showing datacontext:

 private void CheckforWindowsUpdates_Click(object sender, RoutedEventArgs e)
    {
        CheckforWindowsUpdates.IsEnabled = false;
        WinUpdateStatusText.Text = "Evaluation in progress...";
        WinUpdateProgressBar.Visibility = Visibility.Visible;

        WinUpdateProgressBar.IsIndeterminate = true;

        worker = new BackgroundWorker();
        worker.WorkerReportsProgress = true;
        worker.WorkerSupportsCancellation = true;

        DataContext = WindowsUpdate.updateClassList;

        worker.DoWork += delegate(object s, DoWorkEventArgs args)
        {
            WindowsUpdate.getCollectionofMissingSecurityUpdates(WindowsUpdate.windowsKBExceptionsList, WindowsUpdate.CabFilePath);
        };

        worker.ProgressChanged += delegate(object s, ProgressChangedEventArgs args)
        {

        };

        worker.RunWorkerCompleted += delegate(object s, RunWorkerCompletedEventArgs args)
        {
            CheckforWindowsUpdates.IsEnabled = true;
            WinUpdateStatusText.Text = "Evaluation completed. Missing the following updates:";
            WinUpdateProgressBar.IsIndeterminate = false;
            WinUpdateProgressBar.Visibility = Visibility.Hidden;


            if (WindowsUpdate.updateClassList.Count > 0)
            {
                WinUpdateDataGrid.Visibility = Visibility.Visible;
                DownloadandInstallWinUpdatesButton.Visibility = Visibility.Visible;
            }
            else
            {
                WinUpdateDataGrid.Visibility = Visibility.Hidden;
                WinUpdateStatusText.Text = "Evaluation completed. No missing updates.";
            }

        };

        worker.RunWorkerAsync();

    }

XAML for second tab:

Code for second tab:

 private void CheckforThirdPartyUpdatesButton_Click(object sender, RoutedEventArgs e)
    {
        CheckforThirdPartyUpdatesButton.IsEnabled = false;

        worker = new BackgroundWorker();
        worker.WorkerReportsProgress = true;
        worker.WorkerSupportsCancellation = true;

        DataContext = RegScan_ThirdParty.comparisonListWithState;

        worker.DoWork += delegate(object s, DoWorkEventArgs args)
        {
            MainEntry.checkFor3PUpdates();
        };

        worker.ProgressChanged += delegate(object s, ProgressChangedEventArgs args)
        {

        };

        worker.RunWorkerCompleted += delegate(object s, RunWorkerCompletedEventArgs args)
        {


            CheckforThirdPartyUpdatesButton.IsEnabled = true;
        };

        worker.RunWorkerAsync();
    }

Full XAML by request:

Terje · Accepted Answer

My guess would be that you need to set the DataContext specifically to the Grid and the ListBox. Something like this:

WinUpdateDataGrid.DataContext = WindowsUpdate.updateClassList;

and

ThirdPartyListBox.DataContext = RegScan_ThirdParty.comparisonListWithState;

The thing is that if the two functions CheckforWindowsUpdates_Click and CheckforThirdPartyUpdatesButton_Click is precent in the same codebehind file they will set the same DataContext and the binding ItemsSource="{Binding}" in the Grid and the ListBox will inherit the same DataContext.

WPF Shared DataContext / Binding

Answers (2)

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