设置参考CRM 2011插件时出错

Question

我使用下面的代码。一切都很好，直到我想在"var workReportItem"的最后一行的workReportItem上设置客户(帐户)的引用。代码是:

private static void AddWRItoServiceActivity(IOrganizationService service, Guid id)
    {
        using (var crm = new XrmServiceContext(service))
        {
            var serviceactivity = crm.ServiceAppointmentSet.Where(c => c.Id == id).First();
            var serviceitem = crm.brd_serviceitemSet.Where( c => c.brd_RegardingServiceId.Id == serviceactivity.ServiceId.Id);
            foreach (var S in serviceitem)
            {
                var workReportItem = new brd_workreportitem
                   {
                       brd_name = S.brd_name,
                       brd_serviceappointment_brd_workreportitem = serviceactivity,
                       brd_brd_serviceitem_brd_workreportitem_ServiceItem = S,
                       brd_brd_servicereportitem_brd_workreportitem_ServiceReportItem = S.brd_brd_servicereportitem_brd_serviceitem_ServiceReportItem,
                       brd_Customer = serviceactivity.Customers.First().ToEntityReference(),
                    };
                // Setting the optionset value "type"
                OptionSetValue myOptionSet = new OptionSetValue();
                myOptionSet.Value = S.brd_brd_servicereportitem_brd_serviceitem_ServiceReportItem.brd_Type.Value;
                workReportItem.Attributes["brd_type"] = myOptionSet;
                crm.AddObject(workReportItem);
                crm.SaveChanges();
            }
        }
    }

错误是:Value不能为空。参数名称:source。如果有人能帮忙，我将不胜感激。

Answer 1

Looks like Customers为空。您必须对客户集执行另一个查询，以便为服务活动拉回客户。

Answer 2

我使用了下面的代码来设置派对列表上的引用:

ActivityParty activityParty = new ActivityParty { PartyId = new EntityReference(MissionAccount.LogicalName, MissionAccount.Id) };
var customer = new List<ActivityParty>();
customer.Add(activityParty);
serviceactivity.Customers = customer;