public static string ChangeRoot(string file, string oldRootDir, string newRootDir = null)
{
if (oldRootDir != null)
{
oldRootDir = StringTools.PathFltr(oldRootDir + '\\');
if (StringTools.StartsWith(file, oldRootDir, true) == false)
{
throw new Exception("Wrong oldRootDir: " + oldRootDir + ", " + file);
}
file = file.Substring(oldRootDir.Length);
}
if (newRootDir != null)
{
file = StringTools.Combine(newRootDir, file);
}
return(file);
}
