我应该使用什么类型来表示参数是C＃中的文件名？

Question

My functions needs a file name so it can read and/or write to this file. I could use a simple string for this purpose

void myFunc(string filename)

but I'd rather have some more type-safety by requiring a more specialized type and not detect that "" is no valid filename within the method.

The class File doesn't work because it's static.

The class FileInfo could be used but I cannot remember that I've come across a filename argument of this type.

In personal projects I made up my own class that simply does some checking if the filename is well-formed etc. so eg an exception is thrown upon creation of the filename and not in the method itself.

Since the new project is of wider scope I'd thought it would be better to use a common standard to not confuse other users (or my future self in some weeks).

Answer 1

Your thinking about FileInfo was correct - its only constructor has a fileName argument, and it performs basic validation for you. From MSDN :

public FileInfo(string fileName)

Answer 2

If you are finding FileInfo insufficient for some reason, you may be dealing with the file name in a manner that more closely matches a System.Uri . A Uri is not necessarily always related to a file, but a file path can be an example of a Uri, and Microsoft's implementation supports this with the IsFile property. One could imagine a FileUri class which inherits from Uri and IsFile is forced.

It is probably worth mentioning that in most of the MSDN snippets I've been looking at, file paths and names are just passed as strings. This may just be for convenience though.