Multiple File Mask for WinSCP Session.EnumerateRemoteFiles

string FileMask = "*.csv; *.xlsx; *.xls";
 
var sessionOptions = new SessionOptions
{
    Protocol = Protocol.Sftp,
    HostName = ConfigurationManager.AppSettings["FtpHost"],
    UserName = ConfigurationManager.AppSettings["FtpUsr"],
    Password = ConfigurationManager.AppSettings["FtpPwd"],
    SshHostKeyFingerprint = ConfigurationManager.AppSettings["SshHostKeyFingerprint"]
};
 
using (Session session = new Session())
{
    session.Open(sessionOptions);
 
    List<string> files =
        session.EnumerateRemoteFiles("/", FileMask, EnumerationOptions.AllDirectories)
        .Select(fileInfo => fileInfo.FullName)
        .ToList();
 
    Console.WriteLine($"Found {files.Count} files");
}