我希望能够发出警告,如果某一物体可能提出“Null Reference”例外,那么我就可以为这些例外撰写防御守则。
我看着Resharper,但看不出在这方面取得的成就。
《法典》合同可能是非开端合同;申请数量很大,在《法典》合同正式公布之前,在“NET”3.5中写成。
Resharper does in fact accomplish something like this. Possible NullReferenceExpections are highlighted in the IDE in blue, with tooltips when you hover over them.
然后,Resharper在自己的检查结果窗口上跟踪潜在的错误和警告(与视觉演播室的编辑错误和警告分开)。
一般说来,除非您具体提出反对, 至少就汇编者而言,它总是有可能放弃否定的参考。
为了检查提及物体是否可能无效,必须绕开你方案能够走的每一种可能途径,包括你可能使用的任何外部图书馆的道路。 即便是最简单的方案,这种算法也会杀害你的编辑。
我不反对在守则和每种方法中为每个领域盲目辩护的想法。
下面的帮助我决定,在什么地方制止无效价值:
1- Who will be invoking your methods?
If a method is private and you have control over how s it s being accessed, I don t see it makes sense to protect against null checks unless it s part of the method s logic to expect null values.
If a method is exposed to the public (Such as an API), then of course null checks should be a huge concern.
2- Software Design:
Image you have are calling method1(fromAnimalToString(animal)); and for some reason fromAnimalToString() never returns null (Though might return an empty string instead).
Then in such case, it wouldn t make sense to check animal != null in method1() s body
3- Testing:
In software engineering, it s almost impossible to test all possible scenarios that can ever execute. However, test normal and alternative scenarios and make sure the flow is as expected.
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