Calling an attribute method before calling a method with that attribute

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Hallo,

I need to make an Attribute, which checks the minimal authorization
(authorization is specific for application) for calling class method. It
can looks like this:

[Authorization(Rights.Read)]
void SomeMethodRequiresTheReadAccess()
{.....}

But in this case no method of AuthorizationAttribute is called. I add
only attribute to method's collection of attributes and I must tested
the authorization inside the method (respects the attribute value).

Does anybody help me?

George