使用 EWS C# 检索未读电子邮件

Question

下面是我的工作代码片段，它从收件箱下的自定义文件夹名称中检索未读电子邮件。

foreach (Microsoft.Exchange.WebServices.Data.Folder folder in findFolderResults.Folders)
{
LogFile.AppendLog(folder.DisplayName + " folder found in Inbox.");
if (folder.DisplayName == folderName)
{
LogFile.AppendLog(folder.DisplayName + " matches " + folderName);
ItemView view = new ItemView(emailBatch);
do
{
LogFile.AppendLog("Checking for unread emails in folder " + folder.DisplayName);
emailItemList = service.FindItems(folder.Id, sf, view);
foreach (var emailItem in emailItemList.Items)
{
LogFile.AppendLog("Getting unread emails in folder " + folder.DisplayName);
EmailMessage email = EmailMessage.Bind(service, emailItem.Id);
retrievedEmailList.Add((EmailMessage)email);
}
if (!emailItemList.NextPageOffset.HasValue)
break;
}
while (emailItemList.MoreAvailable);
}
}

有一个变量emailBatch当前正配置为10。

我确实了解这意味着它只会一次性检查和检索10未读电子邮件。 但是，一旦10电子邮件被添加到列表中，它是否会继续检查未读电子邮件？

如果发生这种情况，我需要将所有未读电子邮件添加到retrievedEmailList，而不仅仅是 10 封电子邮件。

谢谢。

Answer 1

您需要实现分页搜索。您似乎已经部分尝试了此操作，但是您的代码缺少一些内容。我已经更新了您的代码，并在解释我添加的新代码时添加了注释。

// Set the offset for the paged search.
int offset = 0;
// Set the flag that indicates whether to continue iterating through additional pages.
bool MoreItems = true;
LogFile.AppendLog(folder.DisplayName + " folder found in Inbox.");
if (folder.DisplayName == folderName)
{
// Continue paging while there are more items to page.
while (MoreItems)
{
LogFile.AppendLog(folder.DisplayName + " matches " + folderName);
// Set the ItemView with the page size and offset.
ItemView view = new ItemView(emailBatch, offset, OffsetBasePoint.Beginning);
LogFile.AppendLog("Checking for unread emails in folder " + folder.DisplayName);
emailItemList = service.FindItems(folder.Id, sf, view);
foreach (var emailItem in emailItemList.Items)
{
LogFile.AppendLog("Getting unread emails in folder " + folder.DisplayName);
EmailMessage email = EmailMessage.Bind(service, emailItem.Id);
retrievedEmailList.Add((EmailMessage)email);
}
// Set the flag to discontinue paging.
if (!emailItemList.MoreAvailable)
MoreItems = false;
// Update the offset if there are more items to page.
if (MoreItems)
offset += pageSize;
}
}