从用户控件访问主窗口

Question

I have Login User Control , I want that when the user would click some button inside the user control I need it to make visible some textBox .

In main window I have:

<local:LoginUserCon />
<TextBox x:Name="myTextBox" Visibility="Collapsed"/>

I tried: (In Login User Control):

void Login_Btn(object sender, RoutedEventArgs e)
{
   Application.Current.MainWindow.myTextBox.Visiblity = Visibility.Visible;
}

But it says:

'Window' does not contain a definition for 'myTextBox' and no accessible extension method 'myTextBox'...

Answer 1

Application.Current.MainWindow returns a Window . You need to cast it to whatever your window type is, like for example MainWindow :

void Login_Btn(object sender, RoutedEventArgs e)
{
    MainWindow mainWindow = Application.Current.MainWindow as MainWindow;
    if (mainWindow != null)
        mainWindow.myTextBox.Visiblity = Visibility.Visible;
}