Why XAML button can't invoke argumentless function

Question

I have function in create.cs

    private void FillGrid()
    {
        ClearingEntities CE = new ClearingEntities();
        var Accountss = CE.Accounts;
        DataGrid1.ItemsSource = Accountss.ToList();
    }

I invoke this function from other .cs files just writing FillGrid(); without any arguments

but from xaml in button Click="FillGrid" gives error

click auto generated functions have

  private void Button_Click(object sender, RoutedEventArgs e)

I don't want insert those object sender, RoutedEventArgs e arguments

if I insert those to my function's arguments then other calling should be changed to

FillGrid([argument],[argument]);

note: it is not event handling function just fill data stuff

how to call FillGrid() from xaml? without changing create.cs

in .cs other function call works but in xaml program doesn't evens start — Baganaakh, Jan 27 '20 at 08:29
Can you post a minimal reproducible example with your issue? — tombobadil, Jan 27 '20 at 08:33
You can try something like that. `private void Button_Click(object sender, RoutedEventArgs e) => FillGrid();` For event handling you can not get rid of those arguments but you can kinda "redirect" to you method.... — Mateus Avelar, Jan 27 '20 at 08:33
https://stackoverflow.com/questions/24011869/handling-a-buttons-click-event-in-xaml — Qhori, Jan 27 '20 at 08:50

Felix D. · Accepted Answer · 2020-01-27T09:01:29.253

This is just the way Button Event's work. Read more about EventHandler here

Why don't you just use this:

<Button Click="FillGridClicked" />

//sender = button, RoutedEventArgs = arguments of that event
private void FillGridClicked(object sender, RoutedEventArgs e)
{
    FillGrid();
}

Every ClickEventHandler needs these arguments as it is a custom delegate defined that way. If you really want to emit this you need to extend the button and create a custom click handler for yourself. (see this for example)

Why XAML button can't invoke argumentless function

1 Answers1