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exchange-serverexchangewebservices

EWS - Can't load FirstDayOfWeek property of Appointment.Recurrence

I can successfully load the Recurrence property for an Appointment using EWS (connecting to an Office 365 server), but when I try to access the FirstDayOfWeek property of a WeeklyPattern I always get the following exception:

FirstDayOfWeek threw an exception of type 'Microsoft.Exchange.WebServices.Data.ServiceValidationException

All other properties of the WeeklyPattern seem to load happily (see below) except this.

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Is it possibly down to the requested server version I'm using when creating the ExchangeService object?

thisConnection = New ExchangeService(ExchangeVersion.Exchange2010)

I've checked the AppointmentSchema properties available when loading the Appointment, and other than AppointmentSchema.Recurrence (which I am obviously using) there doesn't seem to be anything else I'm missing there.

Solution

  • The FirstDayOfWeek property is not available in the exchange version you have referenced.

    The property was introduced in Exchange Server 2010 Service Pack 1 (SP1).

    See reference in the Remarks section of this article

    You would need to install that service pack and change your code to the below:

    thisConnection = New ExchangeService(ExchangeVersion.Exchange2010_SP1)