There are two ways to do this: Inheritance and Extension Methods.
Inheritance is simple: add a new class and derive it from the original:
namespace MyProject
{
internal class MyNewControl : OriginalControl
{
... Add your new stuff here ...
}
}All the appropriate methods, fields, properties, events, and so on are available as a part of your new class, and your class code can access all non-
private objects and methods in the base class.
Extension methods are harder, and are mostly used when the original class is
sealed (and all
structs are
sealed so cannot be inherited from). They must be declared in a
static class, and all methods must be declared as static (thought they can be accessed as instance methods if
this is used in teh declaration:
namespace ExtensionMethods
{
public static class MyExtensions
{
public static int MyNewMethod(this OriginalClass cls)
{
return cls.PropertyOfSometype;
}
}
}There is more info here:
Extension Methods - C# | Microsoft Learn[
^]
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