用户没有时,问题查询Active Directory的电子邮件

时间:2011-09-06 20:00:48

标签: c# active-directory

我使用以下代码查询Active Directory:

            using (DirectorySearcher search = new DirectorySearcher(de))
            {
                search.PropertiesToLoad.Add("cn");
                search.PropertiesToLoad.Add("employeeid");
                search.PropertiesToLoad.Add("employeenumber");
                search.PropertiesToLoad.Add("distinguishedname");
                search.PropertiesToLoad.Add("mail");
                search.Filter = @"(&(objectClass=user)(employeeid=*)(employeenumber=*))";
                search.PageSize = 3000;

                SearchResultCollection src = search.FindAll();
                foreach (SearchResult rec in src)
                {
                    yield return new ADUser()
                    {
                        Name = rec.Properties["cn"][0].ToString(),
                        Path = rec.Properties["distinguishedname"][0].ToString(),
                        Acctno = rec.Properties["employeeid"][0].ToString(),
                        Personno = rec.Properties["employeenumber"][0].ToString(),
                        Email = rec.Properties["mail"][0].ToString()
                    };
                }

            }

正如您所看到的,我试图将结果转换为ADUser的IEnumerable列表(我自己的类定义如下):

    public class ADUser
    {
        public string Name { get; set; }
        public string Path { get; set; }
        public string Acctno { get; set; }
        public string Personno { get; set; }
        public string Email { get; set; }
    }

但是,当我遇到没有电子邮件条目的用户时,我的代码会崩溃。当用户没有电子邮件时,似乎SearchResult不包含邮件属性。有没有办法让结果返回属性为null或空值?

感谢您的帮助。

2 个答案:

答案 0 :(得分:1)

评论后编辑:

if (rec.Properties.Contains("mail") && rec.Properties["mail"] != null)
{
  Email = rec.Properties["mail"][0].ToString()
}
else
{
   Email = "No mail"; # or Email = ""; if you want no text returned 

}

答案 1 :(得分:-1)

你应该可以使用??使用电子邮件字符串“null coalescing”运算符。

string s1 = null; string s2 = s1 ?? "S1 was null." // Prints: s2 == "S1 was null."