DotNetCore: cross platform version of GetInvalidFileNameChars?

In .NET Core, there is no direct equivalent to the GetInvalidFileNameChars method found in the System.IO.Path class in the full .NET Framework. However, you can achieve similar functionality using the System.IO.Path.GetInvalidFileNameChars property along with some additional checks and replacements to make it cross-platform.

Here's how you can create a cross-platform version of GetInvalidFileNameChars in .NET Core:

csharpCopy code
using System;

using System.IO;



public static class FileNameHelper

{

    public static char[] GetInvalidFileNameChars()

    {

        char[] invalidChars = Path.GetInvalidFileNameChars();



        // Additional checks and replacements for cross-platform compatibility

        if (Path.DirectorySeparatorChar != '/')

        {

            for (int i = 0; i < invalidChars.Length; i++)

            {

                if (invalidChars[i] == '/')

                {

                    invalidChars[i] = Path.DirectorySeparatorChar;

                }

            }

        }



        return invalidChars;

    }

}



class Program

{

    static void Main(string[] args)

    {

        char[] invalidChars = FileNameHelper.GetInvalidFileNameChars();

        Console.WriteLine("Invalid FileName Chars: " + new string(invalidChars));

    }

}

In the above example, the GetInvalidFileNameChars method retrieves the invalid filename characters using Path.GetInvalidFileNameChars(). Then, we perform additional checks to handle cross-platform differences. For example, if the directory separator character is not / (as on Unix-like systems), we replace / with the appropriate platform-specific directory separator character.

This approach should provide you with a more cross-platform-friendly version of GetInvalidFileNameChars for use in .NET Core applications.