Change Attribute’s parameter at runtime

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Well you learn something new every day, apparently I lied:

What isn’t generally realised is that
you can change attribute instance values fairly
easily at runtime. The reason is, of
course, that the instances of the
attribute classes that are created are
perfectly normal objects and can be
used without restriction. For example,
we can get the object:

ASCII[] attrs1=(ASCII[])
    typeof(MyClass).GetCustomAttributes(typeof(ASCII), false);

…change the value of its public variable and show that it has changed:

attrs1[0].MyData="A New String";
MessageBox.Show(attrs1[0].MyData);

…and finally create another instance
and show that its value is unchanged:

ASCII[] attrs3=(ASCII[])
    typeof(MyClass).GetCustomAttributes(typeof(ASCII), false);
 MessageBox.Show(attrs3[0].MyData);

http://www.vsj.co.uk/articles/display.asp?id=713

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