C# Active Directory连接失败

我需要一点帮助。我是active directory新手。我想用c连接我的active directory。下面是我编写的示例代码

public void GetConnection()
{
    var username = "xxxx";
    var domain = "xxxx";
    var password = "xxxx";
    var path = "LDAP://xxxx/CN=xx";

    DirectoryEntry de = new DirectoryEntry(sDomain + "/" + sDefaultOU, sUsername, sServicePassword, AuthenticationTypes.ServerBind);
    DirectorySearcher ds = new DirectorySearcher(de);        

    ds.Filter = "(&(objectClass=Users))";       

    var sr = ds.FindAll();

    if (sr != null)
    {
        MessageBox.Show("success");
    }
    else
    {
        MessageBox.Show("error");
    }
    }
}

附近有一个未处理的异常

错误是：

System.DirectoryServices.dll中发生类型为“System.Runtime.InteropServices.COMException”的未处理异常

附加信息：未指定的错误

能帮我解决这个问题吗？提前感谢

步骤1

**

步骤2 ** 在主函数中，你需要写下面的函数

 DirectorySearcher _searcher = null;

        SearchResult result_user = null;
            DirectoryEntry de = createDirectoryEntry();
            object o = de.SchemaEntry;
            _searcher = new DirectorySearcher(de, "(&(objectClass=user)(SAMAccountName=" + "user1" + "))");
            if (_searcher != null)
            {
                result_user = _searcher.FindOne();
                de.Close();
            }

---

你想干什么？获取用户列表？是。从所有用户（如电话号码）获取所有a值。为DirectoryEntry的构造函数构造的值是什么？你在斯多曼和斯多姆有什么？

 static DirectoryEntry createDirectoryEntry()
        {
            // create and return new LDAP connection with desired settings  
//This is for ssl secure port for non secure port just make 636 as 389 and //change Authentication as None
            DirectoryEntry ldapConnection = new DirectoryEntry("LDAP://mysystem.domain.com:636","Admin","Domain123",AuthenticationTypes.SecureSocketsLayer);

            return ldapConnection;
        }

 DirectorySearcher _searcher = null;

        SearchResult result_user = null;
            DirectoryEntry de = createDirectoryEntry();
            object o = de.SchemaEntry;
            _searcher = new DirectorySearcher(de, "(&(objectClass=user)(SAMAccountName=" + "user1" + "))");
            if (_searcher != null)
            {
                result_user = _searcher.FindOne();
                de.Close();
            }