gistfile1.cs

[AttributeUsage(System.AttributeTargets.All, AllowMultiple = true, Inherited = true)]
public class ಠ_ಠAttribute : Attribute
{
  public ILog Log { get; set; }

  public ಠ_ಠAttribute()
  {
    Log.Info("This code is bad and you should feel bad");
  }
}

[ಠ_ಠ]
public class SomeClass
{

}