What is the principle of this ILSpy? Can you say it simply or specifically?

[gallop1]

Remarks (备注：请问一下这个ILSpy的原理是什么？能简单或者具体说一说吗？)
Without looking at all the source code methods, please tell me the general principle and implementation process, so that I can better determine whether I understand the implementation process of this tool. Looking forward to the author's reply, as I personally feel that similar to China and the United States, Sino foreign cooperation is a good opportunity.
(备注：在没有查看所有源代码的方法情况下，请告诉我一下大概的原理实现流程，方便我更好确定是否我理解到位此工具的实现过程。期待作者的回复，因为个人感觉类似于中国美国一样，中外合作是一个很好的机会。)