在实现接口时，是否需要处理文件化异常的引发问题

Question

I'm creating a custom C# collection by implementing ICollection in my class and have noticed some of the methods defined by the interface have exceptions documented ie http://msdn.microsoft.com/en-us/library/0efx51xw(v=vs.110).aspx

None of the examples or documentation I've seen for implementing interfaces seem to talk about needing to implement raising exceptions. Whenever the documentation for a method in an interface shows exceptions could be raised by the method should I be checking for each of these conditions and raising the exceptions within my implementation code?

Answer 1

When documenting an interface, it is common to include xml documentation to indicate the exceptions that may be thrown by implementations. This doesn't mean that implementations MUST be able to throw these, just that they MAY throw them.

See Liskov's Substitution Principle. Specifically "No new exceptions should be thrown by methods of the subtype, except where those exceptions are themselves subtypes of exceptions thrown by the methods of the supertype." - http://en.wikipedia.org/wiki/Liskov_substitution_principle