Question

I have a class Human and need to get “IsChecked” value. ItemsSource may have different types, but all classes has IsChecked property.

public class Human{
    public bool IsChecked{
      get;
      set;
    }
}

private void CheckBoxLoaded(object sender, RoutedEventArgs e) //sender is CheckBox
    //How set value from IsChecked?
    var prop = t.GetType().GetProperties().Single(n => n.Name == "IsChecked");//I can access it by this method, but can't set value of sender which CheckBox;
}

Answer 1

I’m assuming that for some reason you can’t refactor your Human class to implement some ICheckable interface, containing IsChecked, right?

If you’re using C# 4.0, an alternative is to use the dynamic data type, which will allow you to set a property only checked at runtime:

private void CheckBoxLoaded(object sender, RoutedEventArgs e) {
     dynamic dynamicObject  = (sender as FrameworkElement).Tag;
     bool checkedState = dynamicObject.IsChecked;
}

And if all else fails and you really have to use reflection, you’re 90% of the way there. You just need to call the PropertyInfo object’s GetValue method, giving it the instance you wish to retrieve the value from:

PropertyInfo prop = t.GetType().GetProperty("IsChecked"); // Simpler.
var isChecked = prop.GetValue(t, null);
(sender as CheckBox).IsChecked = isChecked;