Binary Formatter - Type UserControl is not marked as serializable

Question

I'm trying to serialize my object using BinaryFormatter:

private UserSettings _userSettings;
var serializer = new BinaryFormatter();
using (var file = new FileStream(@"D:\test.bin", FileMode.Create))
{
    serializer.Serialize(file, _userSettings);
}

But I'm getting a strange exception:

Type 'MyCustomUserControl' in Assembly 'xxx' is not marked as serializable.

Class UserSettings doesn't have any reference to MyCustomUserControl but it's referenced by MyCustomUserControl.

Answer 1

The reference to the control can be hidden in an event. If your UserSettings class implements an event to which the control is subscribed, add the [field:NonSerialized] attribute to the event:

[field:NonSerialized]
public event PropertyChangedEventHandler PropertyChanged;