在UWP AppointmentManager中，Appointment.Invitees始终为空

Question

具有参与者的约会在查询是否使用appointment.Invitees属性时始终返回空集合。

这就是我要做的，

var calendarStore = await AppointmentManager.RequestStoreAsync(AppointmentStoreAccessType.AllCalendarsReadOnly);
var appointments = await calendarStore.FindAppointmentsAsync(DateTimeOffset.Now, TimeSpan.FromDays(30), new FindAppointmentsOptions() { IncludeHidden = true });
foreach (var appointment in appointments)
{
    // appointment.Invitees is always null, even for appointments that has some! 
    foreach (var invitee in appointment.Invitees)
    {
        // do something here...
    }
}

我尝试在约会之外添加联系人功能，但徒劳无功。有没有想过为什么会有这么奇怪的行为？

Answer 1

访问Invitees属性时，appointmentsSystem功能是必需的。

 <Package xmlns="http://schemas.microsoft.com/appx/manifest/foundation/windows10"
         xmlns:mp="http://schemas.microsoft.com/appx/2014/phone/manifest"
         xmlns:uap="http://schemas.microsoft.com/appx/manifest/uap/windows10"
         xmlns:rescap="http://schemas.microsoft.com/appx/manifest/foundation/windows10/restrictedcapabilities"
     IgnorableNamespaces="uap mp rescap">

<Capabilities>
    <Capability Name="internetClient"/>
    <uap:Capability Name="appointments" />
    <uap:Capability Name="contacts" />
    <rescap:Capability Name="appointmentsSystem" />   
 </Capabilities>

任何人都不能请求访问此功能以提交商店

请注意，appointmentsSystem在商店应用程序中是无用的。