Qfyilyi

I have the following method in a netcore2.1 web app:

public static void Information(string message, [CallerFilePath] string filePath = "")

{

    var fileNameWithoutExtn = Path.GetFileNameWithoutExtension(filePath);

    . . .

}

When running on azure app service (windows host) it behaves as expected:

filePath =
C:websrcproductionMyWebsiteControllersChallengeController.cs

fileNameWithoutExtn = ChallengeController

But, when I run this on azure's linux container app service:

filePath =
C:websrcproductionMyWebsiteControllersChallengeController.cs

fileNameWithoutExtn =
C:websrcproductionMyWebsiteControllersChallengeController

And

Path.DirectorySeparatorChar = /

Path.AltDirectorySeparatorChar = /

Path.PathSeparator = :

Path.VolumeSeparatorChar = /

Why is CallerFilePath giving me a path which does not match with DirectorySeparatorChar or AltDirectorySeparatorChar ?

PS: I posted the same in msdn forum but did not get any response, hence posting here. I will update here if I hear there.

This is because:

a) Linux uses '' as directory separator, while Windows uses '/'

b) CallerFilePath returns the path on compile time. The code was compiled on Windows, not on Linux.

So you get filePath = C:websrcproductionMyWebsiteControllersChallengeController.cs

A workaround for this is write your own method to get file name, like:

    static void Main(string args)

    {

        char DirectorySeparatorChar='\';



        string path = @"C:websrcproductionMyWebsiteControllersChallengeController.cs";



        string fileName = GetFileNameWithoutExtension(path, DirectorySeparatorChar);



    }



    public static String GetFileName(String path,char DirectorySeparatorChar)

    {

        if (path != null)

        {

            int length = path.Length;

            for (int i = length; --i >= 0;)

            {

                char ch = path[i];

                if (ch == DirectorySeparatorChar )

                    return path.Substring(i + 1, length - i - 1);



            }

        }

        return path;

    }



    public static String GetFileNameWithoutExtension(String path, char DirectorySeparatorChar)

    {

        path = GetFileName(path, DirectorySeparatorChar);

        if (path != null)

        {

            int i;

            if ((i = path.LastIndexOf('.')) == -1)

                return path; 

            else

                return path.Substring(0, i);

        }

        return null;

    }`