private string CheckFileName(string fileName)
{
if (string.IsNullOrEmpty(fileName))
{
fileName = RandomName();
}
if (Path.IsPathRooted(fileName) || fileName.StartsWith("../", StringComparison.Ordinal))
{
throw SpecFailure.TemporaryDirectoryFileNameRooted("fileName");
}
return(Path.Combine(_basePath, fileName));
}
