按类别搜索 Exchange Server EWS

Question

我需要获取所有具有特定类别名称的电子邮件，我该怎么做？

现在我有这个：

var col = new List<SearchFilter>();
col.Add(new SearchFilter.ContainsSubstring(ItemSchema.Categories, "Processed"));
var filter = new SearchFilter.SearchFilterCollection(LogicalOperator.Or, col.ToArray());

FindItemsResults<Item> findResults = service.FindItems(
    WellKnownFolderName.Inbox,
    filter,
    new ItemView(10)
);

但这给了我一个Microsoft.Exchange.WebServices.Data.ServiceResponseException，上面写着{"The Contains filter can only be used for string properties."}

我该怎么做？

Answer 1

AFAIK 自 Exchange 2010 起，类别是一个多值字段，因此它不适用于搜索过滤器。但是，您可以使用AQS 搜索类别。下面的代码应该可以解决问题。

ExchangeService service = GetService(); 

var iv = new ItemView(1000);
string aqs = "System.Category:Processed";
FindItemsResults<Item> searchResult = null;
do
{
    searchResult = service.FindItems(WellKnownFolderName.Inbox, aqs, iv);
    foreach (var item in searchResult.Items)
    {
        Console.WriteLine(item.Subject);
    }
    iv.Offset += searchResult.Items.Count;
} while (searchResult.MoreAvailable == true);