private void ImportFileCallback(IAsyncResult result)
{
//import finished
ImportFinished?.Invoke();
domainsCount = domains.Count;
Log("文件导入完成，共导入了 " + domainsCount.ToString() + " 个域名...");
}
public void OnImportFinished(ImportEventArgs e)
{
ImportFinished?.Invoke(this, e);
}