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I may be way off here, but I thought I remember reading a while back that there is a way to extend an existing class and override its existing functionality.

For instance, is there a way to take LinkButton and extend it to expose a new method or property? Is there a way to override and existing method/property? Like NavigateURL?

I am not talking about subclassing, I am talking about extending. Am I way off here?

Thanks

public static class Extensions {
  public static void NavigateURL(this LinkButton lb, string url) {
    // do something
  }
}

each LinkButton in you project will have this method now (without the first parameter). first parameter uses the prefix 'this' and is of type that you are extending, the rest are method parameters...

Extension Methods, The static class Extensions contains extension methods defined for any type that implements IMyInterface . Classes A , B , and C all implement� In your Student class, add this constructor, assuming you have a constructor that takes two strings in the Person class. public Student(string val1, string val2) : base(val1, val2) { } then you can use it like this. Student student = new Student("Paul", "Catch"); student.code = "1234";

are you talking about extension methods?

http://msdn.microsoft.com/en-us/library/bb383977.aspx

Extension Methods in C#, C# extension method is a static method of a static class, where the "this" modifier is applied to the first parameter. The type of the first parameter� The following example demonstrates the rules that the C# compiler follows in determining whether to bind a method call to an instance method on the type, or to an extension method. The static class Extensions contains extension methods defined for any type that implements IMyInterface. Classes A, B, and C all implement the interface.

Sounds like a straightforward inherited class

public class MyLinkButton : LinkButton
{
    //you can then override any method/property (intellisense will guide you)
    public override bool Enabled
    {
        get
        {
            return base.Enabled;
        }
        set
        {
            base.Enabled = value;
        }
    }
}

As far as I know, you can only override virtual, abstract or already overridden methods/properties in the base class.

c# Class extender, public static class Extensions { public static void NavigateURL(this LinkButton lb, string url) { // do something } }. each LinkButton in you project� C# extension method is a static method of a static class, where the "this" modifier is applied to the first parameter. The type of the first parameter will be the type that is extended. Extension methods are only in scope when you explicitly import the namespace into your source code with a using directive.

C# Extension Method, Extension methods can be added to your own custom class, .NET framework classes, or third party classes or interfaces. In the following example, IsGreaterThan()� Figure 1 - Extending the String Class. Introduction. A while ago I wrote an article on a strategy for extending the string class in the .NET Framework. The problem with extending many .NET 2.0 classes was that they were sealed, so you could not inherit from them, making extending them painful.

C# Programming/Extension methods, Extension methods are a feature new to C# 3.0 and allow you to extend existing types with your Extension methods should be created inside a static class. C# - Extension Method. Extension methods, as the name suggests, are additional methods. Extension methods allow you to inject additional methods without modifying, deriving or recompiling the original class, struct or interface. Extension methods can be added to your own custom class, .NET framework classes, or third party classes or interfaces.

How to work with extension methods in C#, Generic.IEnumerable<T> types. Note that you can take advantage of extension methods to extend a class or an interface but you cannot override� Extension methods allow you to add new methods to existing classes even if you don’t have access to the classes’ source code. For example, the Randomize two-dimensional arrays in C# example shows how to add an extension method to two-dimensional arrays holding data of an arbitrary type.

Comments
  • I would do a class which inherit from what you wanna modify, then override what you're interested in
  • This is exactly what I was looking for! What is the method called? Object Extension?
  • it is called an "extension method"
  • you can do even bad thing redeclaring method with the 'new' keyword. For simple things like adding a method adding an extra class is overwork, and probably an extension method is more suitable, when there si a need to modify behaviour then yes of course.