Null handling.

[PolarbearDK]

This is a really cool project.

If the result of the body of the property is null, then the body of the property is called each time.

This could be fixed using a slightly different implementation:

// begin - fields added by the post-compile step
private static Lazy<Settings> _settings = new Lazy<Settings>(() => __Settings);
public static Settings Settings { get { return _settings.Value; } }
// end

// Property is made private and name changed somehow
private static Settings __Settings
{
	get
	{
		using (var fs = File.Open("settings.xml", FileMode.Open))
		{
			var serializer = new XmlSerializer(typeof(Settings));
			return (Settings)serializer.Deserialize(fs);
		}
	}
}

[bcuff]

Ah yes. This is a problem for reference types. For value types i wrap the value in a container class I think (it's been a while since I wrote this). I could do the same for reference types but Lazy doesn't have the behavior I want. I want it to:

1. Guarantee that the function is called exactly once.
2. Retry should an exception be thrown (Lazy will save and rethrow the exception if one occurs on the first time.)