You never have to cast. I used to think the same way when I started, this ‘pattern’ is incorrect, and not really logical. Your best bet is to use something like: if (sender is TextBox) { TextBox tb = (TextBox)sender; } else if (sender is RichTextBox) { RichTextBox rtb = (RichTextBox)sender; } else { // … Read more
It seems like not supporting Extension methods on Object was a design decision in VB. As a result, the only way we could prevent extension methods from completely breaking existing late bound code was to prevent them from being used on anything typed as object. Link
Everything is early bound in C# unless you go through the Reflection interface. Early bound just means the target method is found at compile time, and code is created that will call this. Whether its virtual or not (meaning there’s an extra step to find it at call time is irrelevant). If the method doesn’t … Read more
You definitely need to read Late Static Bindings in the PHP manual. However, I’ll try to give you a quick summary. Basically, it boils down to the fact that the self keyword does not follow the same rules of inheritance. self always resolves to the class in which it is used. This means that if … Read more
Python is actually behaving as defined. Three separate functions are created, but they each have the closure of the environment they’re defined in – in this case, the global environment (or the outer function’s environment if the loop is placed inside another function). This is exactly the problem, though – in this environment, i is … Read more