Adding dynamically a attribut to a c# class

Question

I have an existing C# class that I cannot modify, but only use it. By example:

public class Test {}

I would like to add dynamically an attribute (MyAttribute) to this class Test, like:

[MyAttribute(TestMode)]
public class Test {}

Is it possible in C# and how?

Note: of course, I can derive from this Test class and add declaratively the attribute, but it means to create a new class, and I'd like to avoid it.

What do you mean when you say **dynamically**? Do you want to add the attribute at runtime? — Daniel Hilgarth, Dec 01 '11 at 10:24
Check this thread: http://stackoverflow.com/questions/129285/can-attributes-be-added-dynamically-in-c — esskar, Dec 01 '11 at 10:27
I second Daniel here. Please clarify what you are trying to accomplish. — jeroenh, Dec 01 '11 at 10:27
Maybe you misunderstood what attributes are. Attributes are information about a `Class` and therefore it's absolutely not related with dynamically add information to an `Object`. What do you want do do? I'm sure the solution is something else. — JiBéDoublevé, Dec 01 '11 at 10:40
A third party system uses a specific attribute to recognize in an assembly some classes its needs. By adding this attribute to the Test class, this one will be recognized too. — Alain, Dec 01 '11 at 10:45

score 6 · Accepted Answer · answered Dec 01 '11 at 10:26

6

Attributes are compiled into metadata and cannot be added at runtime.

answered Dec 01 '11 at 10:26

Felix K.

1 Answers1