user1253414 user1253414 - 3 months ago 18
C# Question

WPF call method parent from usercontrol

I want to call a method from user control in WPF

I´ve a Window with a list and I have a method that get this list.

private ObservableCollection<int> _lst;

public MainWindow()
{
InitializeComponent();

getList();
}

public void getList()
{
_lst = List<int>();
}


In this page I use a usercontrol:

UserControlAAA userControl = new UserControlAAA ();

gridDatos.Children.Add(userControl);


I want to do something like this inside of usercontrol:

Window win = Window.GetWindow(this);

win.getList();


but I can´t call win.getList();

I want to call the method getList from my usercontrol, but I don´t know how to do it.

Answer

You'll need to cast the Window object to the specific window type you're using - which in your case is MainWindow:

MainWindow win = (MainWindow)Window.GetWindow(this);
win.getList();

However, it's not wise to have such coupling between the user control and the window it's hosted in, since that means you will only be able to use it in a window of type MainWindow. It would be better to expose a dependency property in the user control and bind the list to that property - this way the user control will have the data it requires and it will also be reusable in any type of window.