Microsoft Exchange Folders.findItems 結果限制為 1000

Question

我正在嘗試從 Microsoft Exchange 的聯系人文件夾中獲取聯系人列表。
即使文件夾中有更多項目，結果也只返回 1000 個項目。
這是我的代碼。

FindFoldersResults r = service.FindFolders(new FolderId(WellKnownFolderName.PublicFoldersRoot), new FolderView(10));
     Folder folder = getFolder("test", r.Folders);
     ContactsFolder contactsfolder = ContactsFolder.Bind(service, new FolderId(folder.Id.ToString()), new PropertySet(BasePropertySet.IdOnly, FolderSchema.TotalCount));        
     FindItemsResults<Item> items = folder.FindItems(new ItemView(contactsfolder.TotalCount));   

我怎樣才能讓它退回所有物品？

Answer 1

正如 Jason 引用的文章所暗示的那樣，分頁是關鍵。 這是我在 Office365 Exchange Server 上使用的代碼，用於獲取給定文件夾中所有電子郵件的列表（超過 20,000 封電子郵件，頁面大小為 100 時運行速度非常快）：

            // via https://msdn.microsoft.com/en-us/library/office/dn592093(v=exchg.150).aspx
            int pageSize = 100;
            int offset = 0;
            ItemView view = new ItemView(pageSize + 1, offset);
            view.PropertySet = new PropertySet(ItemSchema.Subject, ItemSchema.DateTimeSent);
            view.OrderBy.Add(ItemSchema.DateTimeReceived, SortDirection.Descending);
            view.Traversal = ItemTraversal.Shallow;

            bool moreItems = true;
            ItemId anchorId = null;

            while (moreItems)
            {
                FindItemsResults<Item> results = service.FindItems(buildsFolderId, view);
                moreItems = results.MoreAvailable;
                if (moreItems && anchorId != null)
                {
                    // Check the first result to make sure it matches
                    // the last result (anchor) from the previous page.
                    // If it doesn't, that means that something was added
                    // or deleted since you started the search.
                    if (results.Items.First<Item>().Id != anchorId)
                    {
                        Console.Error.WriteLine("The collection has changed while paging. Some results may be missed.");
                    }
                }

                if (moreItems)
                {
                    view.Offset += pageSize;
                }

                anchorId = results.Items.Last<Item>().Id;

                // Because you’re including an additional item on the end of your results
                // as an anchor, you don't want to display it.
                // Set the number to loop as the smaller value between
                // the number of items in the collection and the page size.
                int displayCount = results.Items.Count > pageSize ? pageSize : results.Items.Count;

                for (int i = 0; i < displayCount; i++)
                {
                    Item item = results.Items[i];

                    Console.WriteLine("[" + item.DateTimeSent + "] " + item.Subject);
                }

                Console.Error.WriteLine("Current offset: {0}/{1}", view.Offset, folder.TotalCount);
            }

Answer 2

我發現這篇文章描述了 EWSFindCountLimit 設置，該設置可能導致限制為 1000 個項目。

這似乎僅適用於 Exchange Server 2010。

限制策略和 EWSFindCountLimit

從New-ThrottlingPolicy ，

Set-ThrottlingPolicy -Identity <ThrottlingPolicyIdParameter> [-EWSFindCountLimit <UInt32>] 

Answer 3

這是相同答案的 PowerShell 版本：

$allItems = @()

$pageSize = 1000
$offset = 0
$ItemView = New-Object Microsoft.Exchange.WebServices.Data.ItemView -ArgumentList ($pageSize + 1), $offset
$ItemView.PropertySet = New-Object Microsoft.Exchange.WebServices.Data.PropertySet ([Microsoft.Exchange.WebServices.Data.BasePropertySet]::FirstClassProperties,[Microsoft.Exchange.WebServices.Data.EmailMessageSchema]::DateTimeReceived)
$ItemView.OrderBy.Add([Microsoft.Exchange.WebServices.Data.EmailMessageSchema]::DateTimeReceived, 'Descending')
$SearchQuery = "sent:>=1/23/2020 AND sent:<=1/24/2020" 
$Folder = 'SentItems'

do
{
    $items = $exchangeService.FindItems($Folder, $SearchQuery, $ItemView)
    Write-Host "Items Count: $($items.Items.Count), offset: $($ItemView.Offset)"

    if ($items.MoreAvailable)
    {
        $ItemView.Offset += $pageSize
    }

    $items.Items | ForEach-Object {
        $allItems += $PSItem
    }
}
while ($items.MoreAvailable)

$allItems.Count