title: Override attribute applied on class
body: <p>I have been testing out Postsharp, specifically the OnMethodBoundaryAspect class, creating subclass (attribute) and implementing some of my own custom logging into a CSV file.</p>
  
  <p>All is working perfectly, and this may not be related to Postsharp at all</p>
  
  <p>I want to apply my subclass (called MethodTraceAttribute) to my main Form object, and then apply it to a method within the Form (with different parameters).</p>
  
  <p>Currently it is writing out two lines in the CSV file, one from the Form attribute, and one for the method attribute.</p>
  
  <p>I want the MethodTraceAttribute on the <strong>method</strong> to override the one been applied to the <strong>class</strong>.</p>
  
  <p>I'm pretty sure I've seen this in MVC3, but generally in .NET Is this possible? - I thought it might have something to do with the AttributeUsage attribute but have done some reading and nope.</p>
  
  <p>EDIT:</p>
  
  <p>For anyone interested, I discovered that Postsharp has an attribute similar to AttributeUsage called MulticastAttributeUsage - I have set this to MulticastTargets.Method | MulticastTargets.InstanceConstructor, AllowMultiple= false and it seems to now do what I want (no longer using the AttributeUsage attribute). I have left the question un-answered as I would like to find a .NET way of doing this</p>