这个问题花了我很多时间解决。首先，错误消息看起来像个玩笑。其次，仅此消息便无所事事。

This question took me a lot of time to solve. First of all, the error message looks like a joke. Second, there is nothing more, just that message.

无论如何，我设法通过以下方式解决了该问题：

Anyway, I managed to fix it by:

1. 确保 userDn 包含整个路径（例如 LDAP：// server-address / CN = + userDn +，OU =可选，DC =您的域，DC = com 。如果您没有提供完整的信息，这实际上非常重要路径将引发HRESULT中的异常：0x80005000 。

1. Making sure that userDn contains the whole path (e.g., "LDAP://server-address/CN=" + userDn + ",OU=optional,DC=your-domain,DC=com". This is actually very important, if you don't supply the full path it will throw an Exception from HRESULT: 0x80005000.

替换 dirEntry.Properties [ member ] .Add（userDn）; 通过 entry.Invoke（ Add，new object [] {userDn}）;

然后我想删除一个用户，并且希望起作用。但是，仅当您使用小写的删除 时，此卑鄙的广告才有效，因此 entry.Invoke（ 删除，新对象[] {userDn}）; 为我工作。

Then I wanted to remove a user and I expected entry.Invoke("Remove", new object[] { userDn }); to work. However, this devilish AD will only work if you use lower case "remove", so entry.Invoke("remove", new object[] { userDn }); worked for me.