使用Microsoft Graph API创建非组织者活动

基础概念

Microsoft Graph API是微软提供的一套统一的RESTful API接口，用于访问Microsoft 365服务中的数据，包括Outlook日历、邮件、联系人等功能。

问题分析

默认情况下，当用户通过Microsoft Graph API创建日历事件时，该用户会自动成为该活动的组织者。要创建当前用户不是组织者的活动，需要特殊处理。

解决方案

方法一：使用代理发送模式

可以通过设置isOrganizer属性和使用代理发送模式来实现：

POST https://graph.microsoft.com/v1.0/me/calendar/events
Content-Type: application/json

{
    "subject": "Team Meeting",
    "start": {
        "dateTime": "2023-11-15T14:00:00",
        "timeZone": "Pacific Standard Time"
    },
    "end": {
        "dateTime": "2023-11-15T15:00:00",
        "timeZone": "Pacific Standard Time"
    },
    "attendees": [
        {
            "emailAddress": {
                "address": "realorganizer@example.com",
                "name": "Real Organizer"
            },
            "type": "required"
        }
    ],
    "isOrganizer": false,
    "organizer": {
        "emailAddress": {
            "address": "realorganizer@example.com",
            "name": "Real Organizer"
        }
    }
}

方法二：使用应用程序权限

首先确保你的应用有Calendars.ReadWrite应用程序权限（不是委托权限）
然后直接以目标组织者的身份创建事件：

POST https://graph.microsoft.com/v1.0/users/realorganizer@example.com/calendar/events
Authorization: Bearer [access-token]
Content-Type: application/json

{
    "subject": "Team Meeting",
    "start": {
        "dateTime": "2023-11-15T14:00:00",
        "timeZone": "Pacific Standard Time"
    },
    "end": {
        "dateTime": "2023-11-15T15:00:00",
        "timeZone": "Pacific Standard Time"
    }
}

方法三：使用Exchange Web Services (EWS)

如果Graph API限制太多，可以考虑使用更底层的EWS API：

// C#示例代码
Appointment appointment = new Appointment(service);
appointment.Subject = "Team Meeting";
appointment.Start = DateTime.Now.AddHours(1);
appointment.End = DateTime.Now.AddHours(2);
appointment.Organizer = new EmailAddress("realorganizer@example.com");
appointment.RequiredAttendees.Add(new Attendee("currentuser@example.com"));
appointment.Save();