Question

(using WPF application)
I get an error when i want to save a bool to a global variable like this:

Window msgOne = new Window();
 if (Properties.Settings.Default.sound01 == true)
  {
    msgOne.radioboxSound.IsChecked = true;
  }
 else
  {
    msgOne.radioboxSound.IsChecked = false;
  }
msgOne.ShowDialog();
//waiting for close
Properties.Settings.Default.sound01 = msgOne.radioboxSound.IsChecked;

where the radioboxSound is the checkbox, and the Properties.Settings.Default.sound01 is the global parameter that you can make in the settings tab in VB c#

The error that i am getting for the last link of above snipit):
Cannot implicitly convert type “bool?” to “bool”. An explicit conversion exist (are you missing a cast?)

But i don’t have used any bool?, only bolls that have been set.

Anyone know how to deal with this one?

thanx

Answer 1

The radio button’s IsChecked property is a ‘bool?’. Change your code to

Properties.Settings.Default.sound01 = msgOne.radioboxSound.IsChecked??false;

A bit more explanation.

Since RadioButton.IsChecked is a Nullable, then regardless of whether the IsThreeState property is set to true or false you will need to handle the fact that IsChecked is nullable.

You could use

Properties.Settings.Default.sound01 = msgOne.radioboxSound.IsChecked == true;

or use the null coalescing operator as above.