C# WPF Call method from a closing window

Question

I have a method in a page public partial class pagThreads : Page for data loading from DB to DataGrid:

public void dbReadData()
{
    DbAccess db = new DbAccess();
    lista = db.GetThreads();
    dgrThreads.ItemsSource = lista;
}

To edit those data I'm opening another window like this (by double clicking on DataGrid row):

private void dgrThreads_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    wndSabThrEdit wndSabThrEdit = new wndSabThrEdit();
    wndSabThrEdit.ShowDialog();
}

After editing I can save the data by updating the record in DB like this:

public void SaveSettings()
{
    DbAccess dbAccess = new();
    dbAccess.UpdateSabThreads();
    string message = "Settings saved.";
    string title = "Information";
    MessageBoxResult result = System.Windows.MessageBox.Show(message, title, MessageBoxButton.OK, MessageBoxImage.Information);
    if(result == MessageBoxResult.OK)
    {
        Close();    
    }
}

The question is: How to trigger the method dbReadData() again to refresh the data in the the DataGrid, for example after closing the editing window? I will be gratefull for help. Thank you!

Can't you just call dbReadData after wndSabThrEdit.ShowDialog();? — Klaus Gütter
– Klaus Gütter, Commented Apr 14, 2022 at 11:16
Hi Klaus, it will be before editing and saving the data in DB. I was wondering to make it somewhere here: if(result == MessageBoxResult.OK) { Close(); } but in this window i can't access dbReadData() method — Piotr Lepka
– Piotr Lepka, Commented Apr 14, 2022 at 11:26
page pagThreads owns DataGrid and dbReadData() and window wndSabThrEdit owns SaveSettings() method — Piotr Lepka
– Piotr Lepka, Commented Apr 14, 2022 at 11:46
Your first suggestion Klaus Gutter was good, thank you! I didn't know that the code stops in ShowDialog().. — Piotr Lepka
– Piotr Lepka, Commented Apr 14, 2022 at 12:04

ispiro · Accepted Answer · 2022-04-14 11:51:36Z

2

From your comment it looks like you think that putting

dbReadData();

after

wndSabThrEdit.ShowDialog();

would run immediately.

It won't.

ShowDialog() blocks, and the code will only continue to dbReadData(); after the Window has closed.

So just change to:

private void dgrThreads_MouseDoubleClick(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    wndSabThrEdit wndSabThrEdit = new wndSabThrEdit();
    wndSabThrEdit.ShowDialog();
    SaveSettings();
}

edited Apr 14, 2022 at 11:51

answered Apr 14, 2022 at 11:43

ispiro

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1 Comment

Piotr Lepka Over a year ago

You're absolutely right. It works like it should!!! Have a good day!

radoslawik · Accepted Answer · 2022-04-14 11:50:20Z

0

If wndSabThrEdit inherits from Window it has a closing event that you can subscribe to:

wndSabThrEdit.Closing += (_,_) => dbReadData();
wndSabThrEdit.ShowDialog();

answered Apr 14, 2022 at 11:50

radoslawik

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