Asp.net 空引用异常-即使存在新关键字

代码如下：

            Dim x As New Google.Apis.Calendar.v3.Data.EventAttendee
            x.Email = "xxccxxxxx@gmail.com"
            x.DisplayName = "xxxxx"
            x.ResponseStatus = "Aproveed"
            Dim y As New Google.Apis.Calendar.v3.Data.EventAttendee
            y.Email = "xxxxxxx@gmail.com"
            y.DisplayName = "suji"
            y.ResponseStatus = "Aproveed"
            Dim attndList As New List(Of EventAttendee)
            attndList.Add(x)
            attndList.Add(y)
            Dim googleCalendarEvent As New [Event]()
            googleCalendarEvent.Attendees.Add(y)'<--- throws exception here
            googleCalendarEvent.Attendees.Add(x)

它将错误显示为

无法强制转换类型为的对象 输入'Google.api.Calendar.v3.Data.EventAttendee' 'System.Collections.Generic.IList`1[Google.api.Calendar.v3.Data.EventAttendee]'

如果您想分配新列表，请执行以下操作

    Dim googleCalendarEvent As New Google.Apis.Calendar.v3.Data.[Event]()
    googleCalendarEvent.Attendees = New List(Of EventAttendee)
    googleCalendarEvent.Attendees.Add(y)
    googleCalendarEvent.Attendees.Add(x)

---

它将抛出以下错误：

无法将“Google.api.Calendar.v3.Data.EventAttendee”类型的对象强制转换为“System.Collections.Generic.IList”

1[Google.api.Calendar.v3.Data.EventAttendee]。`@Bjørn Roger Kringsjå：这是你的工作吗？检查你是否提供了我问题的答案？是的。副本是正确的。属性

Attenders

未实例化。您需要创建一个新实例

googleCalendarEvent.Attendes=新列表（EventAttendee）

 Dim x As New Google.Apis.Calendar.v3.Data.EventAttendee
            x.Email = "xxccxxxxx@gmail.com"
            x.DisplayName = "xxxxx"
            x.ResponseStatus = "Aproveed"
            Dim y As New Google.Apis.Calendar.v3.Data.EventAttendee
            y.Email = "xxxxxxx@gmail.com"
            y.DisplayName = "suji"
            y.ResponseStatus = "Aproveed"
            Dim attndList As New List(Of EventAttendee)
            attndList.Add(x)
            attndList.Add(y)
            Dim googleCalendarEvent As New [Event]()
            googleCalendarEvent.Attendees = attndList

    Dim googleCalendarEvent As New Google.Apis.Calendar.v3.Data.[Event]()
    googleCalendarEvent.Attendees = New List(Of EventAttendee)
    googleCalendarEvent.Attendees.Add(y)
    googleCalendarEvent.Attendees.Add(x)