我如何（正确）从EWS继承类，例如约会？

Question

同样的问题： https ： //stackoverflow.com/questions/11294207/exchange-web-services-argumentexception-using-my-own-contact-class

我试图从Microsoft.Exchange.WebServices.Data.Appointment编写派生类。 但是，如果不抛出看似序列化错误的内容，则无法保存派生类。 即使我没有对派生类进行任何修改，也会发生这种情况。

这有效：

public void CreateTestAppointment() {
        Appointment appointment = new Appointment(Exchange) {
            ItemClass = "IPM.Appointment", //Exchange Specific. Dont touch unless you     know what this does. I sure as hell don't.
            Subject = string.Format("{0} Test", "Oliver")
        };
        appointment.RequiredAttendees.Add("okane@cottinghambutler.com");
        appointment.Body = new MessageBody {
            Text = "Meeting invite body text placeholder"
        };

        //Add item to the appropriate categories
        appointment.Categories.Add(string.Format("[C]{0}", "Arbitrary Client Group"));

        // Add calendar properties to the appointment.
        appointment.Start = DateTime.Now.AddMinutes(10);
        appointment.End = DateTime.Now.AddMinutes(30);

        appointment.Save(Hc360CallCalendarFolderId, SendInvitationsMode.SendOnlyToAll);
    }

但这不是：

 public void CreateTestAppointment() {
        InheritedAppointment appointment = new InheritedAppointment(Exchange) {
            ItemClass = "IPM.Appointment", //Exchange Specific. Dont touch unless you know what this does. I sure as hell don't.
            Subject = string.Format("{0} Test", "Oliver")
        };
        appointment.RequiredAttendees.Add("okane@cottinghambutler.com");
        appointment.Body = new MessageBody {
            Text = "Meeting invite body text placeholder"
        };

        //Add item to the appropriate categories
        appointment.Categories.Add(string.Format("[C]{0}", "Arbitrary Client Group"));

        // Add calendar properties to the appointment.
        appointment.Start = DateTime.Now.AddMinutes(10);
        appointment.End = DateTime.Now.AddMinutes(30);

        appointment.Save(Hc360CallCalendarFolderId, SendInvitationsMode.SendOnlyToAll);
    }

这很奇怪，因为我实际上并没有在派生类中做任何事情。

    public class InheritedAppointment : Microsoft.Exchange.WebServices.Data.Appointment {
    public InheritedAppointment(ExchangeService serivce)
        : base(serivce) {

    }}

它看起来像是被封装到XML，有些值是null，但我不能为我的生活弄清楚它是什么。 这是原始错误

测试名称：TestMeetingCreation测试FullName：Hc360LibTests.UnitTest1.TestMeetingCreation测试源：c：\\ Users \\ okane \\ Documents \\ Visual Studio 2012 \\ Projects \\ HealthCheck360OutlookCallScheduleHelper \\ Hc360LibTests \\ UnitTest1.cs：第15行测试结果：失败测试持续时间：0：00 ：00.5728502

结果消息：测试方法Hc360LibTests.UnitTest1.TestMeetingCreation引发异常：System.ArgumentException：空字符串''不是有效的本地名称。 结果StackTrace：位于Microsoft.Exchange.WebServices.Data.PropertyBag上的Microsoft.Exchange.WebServices.Data.EwsServiceXmlWriter.WriteStartElement（XmlNamespace xmlNamespace，String localName）中的System.Xml.XmlWellFormedWriter.WriteStartElement（String prefix，String localName，String ns）位于Microsoft.Exchange.WebServices.Data上的Microsoft.Exchange.WebServices.Data.CreateRequest 2.WriteElementsToXml(EwsServiceXmlWriter writer) at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.WriteBodyToXml(EwsServiceXmlWriter writer) at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.WriteToXml(EwsServiceXmlWriter writer) at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.EmitRequest(IEwsHttpWebRequest request) at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.BuildEwsHttpWebRequest() at Microsoft.Exchange.WebServices.Data.ServiceRequestBase.ValidateAndEmitRequest(IEwsHttpWebRequest& request) at Microsoft.Exchange.WebServices.Data.MultiResponseServiceRequest 1.Execute（）at Microsoft.Exchange.WebServices.Data.ExchangeService.InternalCreateItems（IEnumerable 1 items, FolderId parentFolderId, Nullable 1 messageDisposition，Nullable 1 sendInvitationsMode, ServiceErrorHandling errorHandling)
at Microsoft.Exchange.WebServices.Data.Item.InternalCreate(FolderId parentFolderId, Nullable 1 sendInvitationsMode, ServiceErrorHandling errorHandling)
at Microsoft.Exchange.WebServices.Data.Item.InternalCreate(FolderId parentFolderId, Nullable 1 sendInvitationsMode, ServiceErrorHandling errorHandling)
at Microsoft.Exchange.WebServices.Data.Item.InternalCreate(FolderId parentFolderId, Nullable 1 messageDisposition，Nullable`1 sendInvitationsMode）at Microsoft.Exchange.WebServices.Data.Appointment.Save（FolderId destinationFolderId，SendInvitationsMode sendInvitationsMode） （）位于c：\\ Users \\ okane \\ Documents \\ Visual Studio 2012 \\ Projects \\ HealthCheck360OutlookCallScheduleHelper \\ HealthCheck360ExchangeLib \\ CallSlotRepository.cs：第70行，位于c：\\ Users \\ okane \\ Documents \\ Visual Studio 2012中的Hc360LibTests.UnitTest1.TestMeetingCreation（） Projects \\ HealthCheck360OutlookCallScheduleHelper \\ Hc360LibTests \\ UnitTest1.cs：第17行

Answer 1

似乎无法保存继承的项目。

如果您在EWS托管API的代码中看得太深，您会发现序列化从ServiceObjectDefinitionAttribute或方法ServiceObject.GetXmlElementNameOverride确定XML中的元素名称。 Appointment类继承自Item，而Item又继承自ServiceObject。 Appointment类还具有ServiceObjectDefinitionAttribute，并使用XML元素名称“CalendarItem”进行序列化。

因此，要使用从Appointment继承的类，您需要在类上使用ServiceObjectDefintionAttribute，或者必须覆盖GetXmlElementNameOverride。 不幸的是ServiceObjectDefintionAttribute和GetXmlElementNameOverride是内部的，所以没有办法做到这一点。

问题是为什么要使用继承的类？ 您是否希望Exchange能够保存您班级的属性？ 在这种情况下，您可能需要查看ExtendedProperties 。

更新：

如果要将扩展属性公开为您自己类的真实属性，可以通过委派给约会对象来完成。 它并不完美，但它是一个选择：

public class ExtendedAppointment
{
    Appointment _appointment;

    public ExtendedAppointment(Appointment appointment)
    {
        _appointment = appointment;
    }

    public Appointment Appointment { get { return _appointment; } }

    public object SomeExtendedProperty
    {
        get 
        { 
            return _appointment.ExtendedProperties[0].Value;
        }

        set
        {
            _appointment.ExtendedProperties[0].Value = value;
        }
    }
}