EWS(Exchange Web Service) 身份验证与 Exchange Server 2013

我是使用 c# 和 exchange Web 服务的新用户，遇到了问题。 我正在尝试做的是将约会添加到 Outlook 日历中。

    ExchangeService service = null;
    public WebService1()
    {
        service = new ExchangeService(ExchangeVersion.Exchange2013);
        service.UseDefaultCredentials = false;
        service.Credentials = new WebCredentials("user1@mydomain`enter code here`.com", "password");

        service.TraceEnabled = true;
        service.TraceFlags = TraceFlags.All;
        ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallBack;


        service.Url = new Uri("https://mydomain/EWS/Exchange.asmx");
        service.TraceListener = new TraceListener();
    // Optional flags to indicate the requests and responses to trace.
        service.TraceFlags = TraceFlags.All;
        service.TraceEnabled = true;
        service.TraceListener.Trace("begin", service.HttpHeaders.ToString());}
       [WebMethod]
        public string addMeeting(string userNameList, string subject, string content, string beginDate, string endDate, string location="", string optionalUserList="", string remindTime="")
    {
        try
        {
            Appointment meeting = Appointment.Bind(service, new ItemId("meeting"));
            if (userNameList == "")
            {
                return "FAIL: NO USER IS ADDED! PLEASE CHECK AGAIN!";
            }
            meeting.Subject = subject.Trim() == "" ? "未知主题" : subject;
            meeting.Body = content.Trim() == "" ? "未知内容" : content;
            meeting.Start = DateTime.Parse(beginDate);
            meeting.End = DateTime.Parse(endDate);
            meeting.Location = location == "" ? "未知地点" : location;
            string[] userListArr = userNameList.Split(new Char[] { ';', ',' });
            foreach (string s in userListArr)
            {
                if (s.Trim() != "")
                {
                    meeting.RequiredAttendees.Add(s);
                }
            }
            string[] opUserListArr = optionalUserList.Split(new Char[] { ';', ',' });
            foreach (string s in opUserListArr)
            {
                if (s.Trim() != "")
                {
                    meeting.OptionalAttendees.Add(s);
                }
            }
            remindTime = remindTime.Trim() == "" ? "60" : remindTime;
            meeting.ReminderMinutesBeforeStart = int.Parse(remindTime);
            meeting.Save(SendInvitationsMode.SendToAllAndSaveCopy);
            return "SUCCESS";
        }
        catch (Exception ex)
        {
            return ex.Message + "'n" + ex.StackTrace + "'n'n" + ex.Source +" 'n" + ex.ToString();
        }
    }

当我在 VISIO Studio 中调试它，然后将其放入 IIS 时，这效果很好，没有任何进展！我发现在交换服务器上的日志文件中，记录了错误代码 401。然后我发现ews的身份验证设置为"base，NTLM，Windows身份验证，Windows SharePoint安全，OAuth"。

我问如何更改我的代码以获得这些身份验证。谢谢！

原谅我糟糕的英语。