由于我们需要使用 LDAPS 连接到 LDAP 服务器，因此我们必须使用 LdapConnection 而不是 DirectoryEntry。

这是源代码：

        SearchResponse response;
        using (LdapConnection con = new LdapConnection(new LdapDirectoryIdentifier(Host, Port)))
        {
            if (IsSSL)
            {
                con.SessionOptions.SecureSocketLayer = true;
                con.SessionOptions.VerifyServerCertificate =
                    (connection, certificate)
                    => true;
            }
            con.Credential = new NetworkCredential(_username, _password);
            con.AuthType = AuthType.Basic;
            con.Bind();

            if (logMessage != null)
                logMessage("Connected to LDAP");

            string sFilter = String.Format(
                "(&(objectcategory=person)(objectclass=user){0}(!(userAccountControl:1.2.840.113556.1.4.803:=2)))",
                filter
                );

            SearchRequest request = new SearchRequest("OU=Corp,DC=mydc,DC=com", sFilter, SearchScope.Subtree);
            request.Attributes.Add(Resources.objectguid);
            request.Attributes.Add(Resources.givenname);
            request.Attributes.Add(Resources.sn);
            request.Attributes.Add(Resources.initials);
            request.Attributes.Add(Resources.samaccountname);
            request.Attributes.Add(Resources.userprincipalname);
            request.Attributes.Add(Resources.mail);
            request.Attributes.Add(Resources.objectsid);
            request.Attributes.Add(Resources.department);
            request.Attributes.Add(Resources.company);
            request.SizeLimit = 10;

            response = (SearchResponse) con.SendRequest(request);
        }

执行源代码后（我们已经验证了凭据、主机、端口等 - 使用外部第 3 方软件），我们得到以下异常：

超出了大小限制

描述：执行当前 Web 请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其在代码中的来源的更多信息。

异常详细信息：System.DirectoryServices.Protocols.DirectoryOperationException：超出了大小限制

来源错误：

response = (SearchResponse) con.SendRequest(request);

[DirectoryOperationException: The size limit was exceeded]
   System.DirectoryServices.Protocols.LdapConnection.ConstructResponse(Int32

messageId、LdapOperation 操作、ResultAll 结果类型、TimeSpan requestTimeOut，布尔异常OnTimeOut）+2385 System.DirectoryServices.Protocols.LdapConnection.SendRequest（DirectoryRequest 请求，时间跨度请求超时）+499 System.DirectoryServices.Protocols.LdapConnection.SendRequest（DirectoryRequest 请求）+50 UserSearchProvider.ADUserSearchProvider.QueryStore（UserSearchCriteriaCollection 标准、行动1 logMessage) in c:\Users\stemarie\Documents\Visual Studio 2012\Projects\Idealink.Modules\UserSearchProvider\UserSearchProvider\ADUserSearchProvider.cs:298 UserSearchProvider.UserSearchProvider.QueryAndSort(UserSearchCriteriaCollection criterias, Action1 logMessage) 在 c:\Users\stemarie\Documents\Visual 中 工作室 2012\项目\Idealink.Modules\UserSearchProvider\UserSearchProvider\UserSearchProvider.cs:77 UserSearchProvider.UserSearchProvider.Search（UserSearchCriteriaCollection 标准、行动1 logMessage) in c:\Users\stemarie\Documents\Visual Studio 2012\Projects\Idealink.Modules\UserSearchProvider\UserSearchProvider\UserSearchProvider.cs:33 UserSearchProvider.UserSearchService.Search(UserSearchCriteriaCollection criterias, Action1 logMessage) 在 c:\Users\stemarie\Documents\Visual 中 工作室 2012\项目\Idealink.Modules\UserSearchProvider\UserSearchProvider\UserSearchService.cs:44 UserSearchProviderTest._Default.Page_Load（对象发送者，EventArgs e）位于 c:\Users\stemarie\Documents\Visual Studio 2012\项目\Idealink.Modules\UserSearchProvider\UserSearchProviderTest\Default.aspx.cs:28

让我困惑的部分是我们确实指定了最大大小限制，我们不想要超过 100 个条目 - 我们想要限制它。但即使我们将 SizeLimit 指定为 1，库仍然会抛出错误。

有人对这个问题有任何见解/建议吗？我们已经非常接近实现这一目标，只需要解决最后一个问题。

您应该在与此类似的函数中使用 cookie。 该函数返回 SearchResponse 对象的集合，调用者应该循环遍历该集合。

private List<SearchResponse> SearchDirectory(string distinguishedName, string searchFilter, System.DirectoryServices.Protocols.SearchScope searchScope, params string[] attributeList)
{
    List<SearchResponse> result = new List<SearchResponse>();
    SearchResponse response = null;
    int maxResultsToRequest = 100;
    try
    {
        PageResultRequestControl pageRequestControl = new PageResultRequestControl(maxResultsToRequest);

        // used to retrieve the cookie to send for the subsequent request
        PageResultResponseControl pageResponseControl;
        SearchRequest searchRequest = new SearchRequest(distinguishedName, searchFilter, searchScope, attributeList);
        searchRequest.Controls.Add(pageRequestControl);

        while (true)
        {
            response = (SearchResponse)connection.SendRequest(searchRequest);
            result.Add(response);
            pageResponseControl = (PageResultResponseControl)response.Controls[0];
            if (pageResponseControl.Cookie.Length == 0)
                break;
            pageRequestControl.Cookie = pageResponseControl.Cookie;
        }
    }
    catch (Exception e)
    {
        // do something with the error

    }
    return result;
}