private static void Main(string[] args)
{
// NOTE: You can't cast the structs to IWriter here.
var structs = Worker.DoSomething();
// This will not compile:
// (structs.FirstOrDefault() as IWriter).Property1 = 10
}
private static void Main(string[] args)
{
// NOTE: You COULD cast the structs to IWriter here.
var structs = Worker.DoSomething();
}