Question

I’m new to C#.

I’m trying to uncheck all checkboxes in my application using this code

foreach (CheckBox control in this.Controls.OfType<CheckBox>()) {
    control.Checked = false;
}

But in this line CheckBox control in this.Controls.OfType<CheckBox>(), Controls is underlined in red. When I try to run the program, I get the following error:

Error   1   'FedApp.MainWindow' does not contain a definition for 'Controls' and no extension method 'Controls' accepting a first argument of type 'FedApp.MainWindow' could be found (are you missing a using directive or an assembly reference?)

Note I’m using the following:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

FedApp is the name of the application. Please how do I fix it. Thanks for any suggestion.

Answer 1

To enum the controls in a WPF window I think you should do something like this

foreach (object o in LogicalTreeHelper.GetChildren(FedApp.MainWindow))
{
  if (o is CheckBox)
  {
      ((CheckBox)o).Checked = false;
  }
}