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
– Daniel Hilgarth, Commented Dec 1, 2011 at 10:24
I second Daniel here. Please clarify what you are trying to accomplish. — jeroenh
– jeroenh, Commented Dec 1, 2011 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
– JiBéDoublevé, Commented Dec 1, 2011 at 10:40

Felix K. · Accepted Answer · 2011-12-01 10:26:16Z

6

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

answered Dec 1, 2011 at 10:26

Felix K.

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