The ThreadProc method creates an application domain, creates a TestClass object in the domain, and calls a method of TestClass that unloads the executing domain, causing an AppDomainUnloadedException.

• ThreadProc方法创建一个应用程序域,在该域中创建一个TestClass对象,并调用卸载正在执行的域的TestClass的方法,引发AppDomainUnloadedException异常。