EntLib 4.0:异常处理应用程序块

我真的要做什么

 try
 {
     //Do something with a DirectoryInfo object
 }
 catch(DirectoryNotFoundException ex)
 {
   bool rethrow = ExceptionPolicy.Handle(ex, _exceptionPolicyName);

   if(rethrow)
        throw;
 }

我想处理异常的任何地方?

还是我应该把顶层包起来

 try
 {
     //Entrypoint code
 }
 catch(Exception ex)
 {
   bool rethrow = ExceptionPolicy.Handle(ex, _exceptionPolicyName);

   if(rethrow)
        throw;
 }

我的印象是我可以用属性来表现这一点?