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我使用 EWS 托管 API 在我的 c# 项目和我们的 Exchange 2010 服务器之间进行通信。从现在到三天后，我使用此代码获取收件箱中的所有邮件。

    var ews = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
    ews.Credentials = new NetworkCredential(usr, psw, dmn);
    ews.AutodiscoverUrl(url);

    PropertySet itempropertyset = new PropertySet(BasePropertySet.FirstClassProperties);
    itempropertyset.RequestedBodyType = BodyType.Text;

    ItemView view = new ItemView(int.MaxValue);
    FindItemsResults<Item> findResults;
    view.PropertySet = itempropertyset;

    do
    {
        findResults = ews.FindItems(WellKnownFolderName.Inbox, view);

        foreach (Item item in findResults.Items)
        {
            if (item.DateTimeCreated < DateTime.Now.AddDays(-3)) continue;

            item.Load(itempropertyset);

            var message = EmailMessage.Bind(ews, item.Id,
                new PropertySet(BasePropertySet.FirstClassProperties, ItemSchema.Attachments));

            string to = message.ToRecipients[0].Address.ToLower();
            string body = item.Body;
        }

        view.Offset += findResults.TotalCount;
    } while (findResults.MoreAvailable);

现在的问题。我想改进这条线 if (item.DateTimeCreated < DateTime.Now.AddDays(-3)) continue;，因为当我使用它时，api会从收件箱中获取所有消息，如果它超过三天就继续。我想在代码的前面指定这个过滤器，所以 api 不必处理所有消息。

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1 回答 1

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If I understand the problem correctly, this should work. You can see all search filters available here: EWS Search Filters

ItemView view = new ItemView(int.MaxValue);
FindItemsResults<Item> findResults;
view.PropertySet = itempropertyset;

SearchFilter searchFilter = 
   new SearchFilter.IsGreaterThan(ItemSchema.DateTimeReceived, DateTime.Now.AddDays(-3));

findResults = service.FindItems(WellKnownFolderName.Inbox, searchFilter, view);
于 2013-03-21T21:49:01.950 回答