网络 空引用;会造成异常;空引用的异常
For example, you may get a NullReferenceException on a line that calls the internal design-time assemblies, which you can´t debug, so you´re left wondering which service failed where.
例如,您可能在调用内部设计时程序集的行中得到NullReferenceException,而您无法调试该错误,因此您只能纳闷哪个服务在哪个地方失败了。