DirectoryEntry按物业部门过滤

Question

我有此代码，可以从用户，他的电子邮件和部门中检索信息，并向其传递用户名和密码。

string email;
string depa;

private bool AutenticatheUser(String userName, String password)
{
    bool ret = false;

    try
    {   
        DirectoryEntry de = new DirectoryEntry(GetCurrentDomainPath(), userName, password);

        DirectorySearcher dsearch = new DirectorySearcher(de);
        dsearch.Filter = "sAMAccountName=" + userName + "";

        SearchResult results = null;

        results = dsearch.FindOne();

        email = results.GetDirectoryEntry().Properties["mail"].Value.ToString();
        depa = results.GetDirectoryEntry().Properties["department"].Value.ToString();
        ret = true;
    }
    catch(Exception ex)
    {
        ret = false;
        MessageBox.Show(ex.Message,"Error",MessageBoxButtons.OK,MessageBoxIcon.Error);
    }

    return ret;
}  

数据返回示例：

email = juanitoRg@companny.com and depa = US-Oneonta

因此，使用以下代码，我尝试恢复所有US-Oneonta用户，但是在if（depa ==“ US-Oneonta”）之前（如果我拥有部门），我什么也不会恢复。具体来说。

private void GetAllUsers()
{
        SearchResult result;
        SearchResultCollection results;
        DirectorySearcher ds = null;
        DirectoryEntry de = new DirectoryEntry(GetCurrentDomainPath());

        ds = new DirectorySearcher(de);
        ds.PropertiesToLoad.Add("mail");
        ds.PropertiesToLoad.Add("department");
        ds.Filter = "(&(objectCategory=User)(objectClass=person))";

        results = ds.FindAll();

        int qty = 0;
        label1.Text = Convert.ToString(results.Count);

        foreach (SearchResult sr in results)
        {
            if (sr.Properties.Contains("mail") && sr.Properties.Contains("department"))
            {
                string depa = sr.Properties["department"][0].ToString();

                if (depa == "US-Oneonta")
                {
                    int file = dataGridView1.Rows.Add();
                    dataGridView1.Rows[file].Cells["Column1"].Value = sr.Properties["mail"][0].ToString();
                    dataGridView1.Rows[file].Cells["Column2"].Value = sr.GetDirectoryEntry().Properties["department"][0].ToString();
                }

                depa = string.Empty;
            }
        }
}  

如何恢复其部门具有US-Oneonta描述的所有用户？