DependencyProperty attached properties for Wf,wpf,silverlight

Note that the DependencyProperty attached property, not the binding property

First look at a hypothesis,

How to extend a member of a class without modifying a class (inheritance is not possible)

This is not possible in the traditional OO design, but in NET3.0 (c#3.0,vb.net9.0) provides an extension method to implement this function

Look at the following example:

Scene: I often have to use the results of the number 2, how to easily achieve

class Program
{
static void Main(string[] args)
{
double v1 = 123;
double p1 = v1.zzzzz();
System.Console.WriteLine(p1);

//--
double p2=(1234567890.123).zzzzz();
System.Console.WriteLine(p2);
}
}

static class myExtension
{
public static double zzzzz(this double d)
{
return d/2 ;
}
}

This is the extension method that adds the [Zzzzz] method to [double] without modifying the structure.

That's the way LINQ works.

Method can do that, what about the attribute?

Upgrade the requirements, I think an object in an environment automatically more than a few attributes, in another environment and automatically more than a few other attributes

How to do it,

Let's take a look at Silverlight.

Scene: Provides a container, the container is divided into two rows, into the container in the meaning of the control can set the properties of additional properties [MyTag], [MyTag] Property set to [a] on the left, set to [b] on the right