How do I get .NET's Path.Combine to convert forward slashes to backslashes?

I'm using Path.Combine like so:

Path.Combine("test1/test2", "test3\\test4");

The output I get is:

test1/test2\test3\test4

Notice how the forward slash doesn't get converted to a backslash. I know I can do string.Replace to change it, but is there a better way of doing this?

Solution 1:

As others have said, Path.Combine doesn't change the separator. However if you convert it to a full path:

Path.GetFullPath(Path.Combine("test1/test2", "test3\\test4"))

the resulting fully qualified path will use the standard directory separator (backslash for Windows).

Note that this works on Windows because both \ and / are legal path separators:

Path.DirectorySeparatorChar = \
Path.AltDirectorySeparatorChar = /

If you run on, say, .NET Core 2.0 on Linux, only the forward slash is a legal path separator:

Path.DirectorySeparatorChar = /
Path.AltDirectorySeparatorChar = /

and in this case it won't convert backslash to forward slash, because backslash is not a legal alternate path separator.

Solution 2:

Because your "test1/test2" is already a string literal, Path.Combine will not change the '/' for you to a '\'.

Path.Combine will only concat the 2 string literals with the appropriate path delimiter used by the OS, in this case Windows, which is '\', from there your output

test1/test2\test3\test4

Your best bet would be the string.Replace.