Exchage 2007 Client Application Functions（5） -- 如何设置邮件为已读

     public bool SetIsReadFlag(ItemIdType itemId)
        {
            SetItemFieldType setField = new SetItemFieldType();
            MessageType message = new MessageType();
            message.IsRead = true;
            message.IsReadSpecified = true;
            setField.Item1 = message;

            PathToUnindexedFieldType path = new PathToUnindexedFieldType();
            path.FieldURI = UnindexedFieldURIType.messageIsRead;
            setField.Item = path;


            ItemChangeType[] updatedItems = new ItemChangeType[1];
            updatedItems[0] = new ItemChangeType();
            updatedItems[0].Updates = new ItemChangeDescriptionType[1];
            updatedItems[0].Updates[0] = setField;

            ItemChangeDescriptionType[] updates = new ItemChangeDescriptionType[1];
            updates[0] = new ItemChangeDescriptionType();
            updates[0].Item = path;

            updatedItems[0].Item = new ItemIdType();
            ((ItemIdType)updatedItems[0].Item).Id = itemId.Id;
            ((ItemIdType)updatedItems[0].Item).ChangeKey = itemId.ChangeKey;


            UpdateItemType request = new UpdateItemType();
            request.ItemChanges = updatedItems;
            request.ConflictResolution = ConflictResolutionType.AutoResolve;
            request.MessageDisposition = MessageDispositionType.SaveOnly;
            request.MessageDispositionSpecified = true;
            request.SendMeetingInvitationsOrCancellations = CalendarItemUpdateOperationType.SendToChangedAndSaveCopy;
            request.SendMeetingInvitationsOrCancellationsSpecified = true;

            UpdateItemResponseType response = this.m_esb.UpdateItem(request);

            if (response.ResponseMessages.Items[0].ResponseClass != ResponseClassType.Success)
                return false;
            else
                return true;
        }