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Is it safe to use _ in class names?
What's the best replacement for . in naming? (Currently I use _.)
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Usually an underscore is used in member variables so as to distinguish between member variables, static member variables & local variables. This way the scope of the variable is visible in the variable name itself.
Usually underscore before a member is used when the member is private. It is usefull in language that does not have a builtin way to declare members private, like python. Show activity on this post.
Naming Conventions: Underscores. The underscore character ('_') can be used in the following situations. When naming formal parameters, it should be used as the first character. In the DEL_ prefix.
A name prefixed with an underscore (e.g. _spam) should be treated as a non-public part of the API (whether it is a function, a method or a data member). It should be considered an implementation detail and subject to change without notice. Let’s instantiate the above class and try to access the name and _age attributes.
It's safe to do so for one underscore at a time, although you shouldn't use two consecutive underscores. From the C# language spec, section 2.4.2:
Identifiers containing two consecutive underscore characters (U+005F) are reserved for use by the implementation. For example, an implementation might provide extended keywords that begin with two underscores.
Personally I try to avoid type names with underscores anyway though... I'm not sure what you mean by "replacement for ." though. If you could give some context, that would help.
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As others have mentioned, it is safe. However, Microsoft's Class Naming Guidelines read:
Do not use the underscore character (_).
As Jon Skeet mentioned, a good alternative would be to replace . with Dot. For example, a class related to drive.google.com could be named DriveDotGoogle. (I think the DotCom portion could be omitted so as not to unnecessarily lengthen the name.)
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