Building the list of classes requires gathering information from your application while it runs, or using a utility that can determine which classes your application will load.
构建类列表需要在应用程序运行时从其中收集信息，或者使用一个实用工具来确定应用程序将加载哪些类。
2
If you implement the quick and easy approach I've described, you can make your Web applicationload drop-down list items just once for the duration of the application's runtime.