public int Generate()
{
if (Marks.Count == 0 &&
!File.Exists(Source) &&
!Directory.Exists(Target))
{
return(0);
}
foreach (var mark in Marks)
{
if (!CreateMarkedFile(mark, Source, Target))
{
var sourceName = Path.GetFileNameWithoutExtension(Source);
throw new Exception($"创建水印文件：\n{sourceName}_{mark.Text}\n到\n{Target}\n失败。");
}
}
return(Marks.Count());
}