搜索具有上次修改时间的 EWS 日历项目

Question

我正在使用 Exchange Web 服务搜索CalendarItems。在 MSDN 文档中，有一个名为 LastModifiedTime 的字段。

如何使用 Exchange Server 绑定按 LastModifiedTime 查询 CalendarItems？

Answer 1

我找到了一种使用限制的方法

（但是通过搜索
如果 findItemRequest 对象的
findItemRequest.Item
findItemRequest.Restrictions 属性已定义
它给出组合错误...）

如果仅为 findItemRequest 对象定义了 Item 或 Restrictions，则它可以工作

        List<CalendarInfo> calendarEvents = new List<CalendarInfo>();

        ExchangeServiceBinding esb = EWS.Helper.ExchangeHelper.GetExchangeBinding(credentials);

        // Form the FindItem request.
        FindItemType findItemRequest = new FindItemType();


        CalendarViewType calendarView = new CalendarViewType();
        calendarView.StartDate = criteria.StartDateAndTime;
        calendarView.EndDate = criteria.EndDateAndTime;

        if (criteria.MaxItemsToReturn > 0)
        {
            calendarView.MaxEntriesReturned = criteria.MaxItemsToReturn;
            calendarView.MaxEntriesReturnedSpecified = true;
        }

        findItemRequest.Item = calendarView;

        //--
        PathToExtendedFieldType sySyncProp = new PathToExtendedFieldType();



        sySyncProp.PropertyTag = "0x3008";
        sySyncProp.PropertyType = MapiPropertyTypeType.SystemTime;
        // Define restrictions

        RestrictionType ffRestriction = new RestrictionType();
        IsGreaterThanOrEqualToType ieGreater = new IsGreaterThanOrEqualToType();

        ieGreater.FieldURIOrConstant =  new FieldURIOrConstantType();
        ieGreater.FieldURIOrConstant.Item = new ConstantValueType();
        (ieGreater.FieldURIOrConstant.Item as ConstantValueType).Value = DateTime.Now.AddDays(-1).ToUniversalTime().ToString("u");
        ieGreater.Item = sySyncProp;

        ffRestriction.Item = ieGreater;

       findItemRequest.Restriction = ffRestriction;

        //--
        // Define which item properties are returned in the response.
        ItemResponseShapeType itemProperties = new ItemResponseShapeType();

        // Use the Default shape for the response. 
        itemProperties.BaseShape = DefaultShapeNamesType.AllProperties;
        //insert last modified time value also to responses
        PathToExtendedFieldType[] ptufta = new PathToExtendedFieldType[1];
        ptufta[0] = new PathToExtendedFieldType();
        ptufta[0].PropertyTag = "0x3008"; //Property Tag for LastModifiedTime 
        ptufta[0].PropertyType = MapiPropertyTypeType.SystemTime;
        itemProperties.AdditionalProperties = ptufta;

        findItemRequest.ItemShape = itemProperties;

        DistinguishedFolderIdType[] folderIDArray = new DistinguishedFolderIdType[1];
        folderIDArray[0] = new DistinguishedFolderIdType();
        folderIDArray[0].Id = DistinguishedFolderIdNameType.calendar;

        if (!string.IsNullOrEmpty(criteria.EmailAddress))
        {
            folderIDArray[0].Mailbox = new EmailAddressType();
            folderIDArray[0].Mailbox.EmailAddress = criteria.EmailAddress.Trim();
        }

        findItemRequest.ParentFolderIds = folderIDArray;

        // Define the traversal type.
        findItemRequest.Traversal = ItemQueryTraversalType.Shallow;

        try
        {
            // Send the FindItem request and get the response.
            FindItemResponseType findItemResponse = esb.FindItem(findItemRequest);

            // Access the response message.
            ArrayOfResponseMessagesType responseMessages = findItemResponse.ResponseMessages;
            ResponseMessageType[] rmta = responseMessages.Items;

            int folderNumber = 0;

            foreach (ResponseMessageType rmt in rmta)
            {
                // One FindItemResponseMessageType per folder searched.
                FindItemResponseMessageType firmt = rmt as FindItemResponseMessageType;

                if (firmt.RootFolder == null)
                    continue;

                FindItemParentType fipt = firmt.RootFolder;
                object obj = fipt.Item;

                // FindItem contains an array of items.
                if (obj is ArrayOfRealItemsType)
                {
                    ArrayOfRealItemsType items = (obj as ArrayOfRealItemsType);
                    if (items.Items == null)
                    {
                        // Console.WriteLine("Folder {0}: No items in folder", folderNumber);
                        folderNumber++;
                    }
                    else
                    {
                        CalendarInfo ce;
                        CalendarItemType cal;
                        foreach (ItemType it in items.Items)
                        {

                            if (it is CalendarItemType)
                            {
                                cal = (CalendarItemType)it;
                                ce = GetCalendarInfo(esb, cal);
                                calendarEvents.Add(ce);
                            }
                            //Console.WriteLine("Folder {0}: Item identifier: {1}", folderNumber, it.ItemId.Id);

                        }

                        folderNumber++;
                    }
                }
            }

            //Console.ReadLine();
        }
        catch (Exception e)
        {
            throw;
        }


        return calendarEvents;