/// <summary>
/// Get the next set of emails async.
/// </summary>
/// <returns>Task which returns all the pages for the next set of emails.</returns>
private async Task <IEnumerable <Email> > GetEmailsAsync()
{
try
{
await UpdatePages();
IList <Email> emails = new List <Email>();
ProcessMessages(ref emails);
while (_nextEmailPageRequest != null)
{
_curEmailPage = await _nextEmailPageRequest.GetAsync();
ProcessMessages(ref emails);
_nextEmailPageRequest = _curEmailPage.NextPageRequest;
}
return(emails);
}
catch (ServiceException ex)
{
Console.WriteLine("Error getting emails:");
Console.WriteLine(ex);
return(null);
}
}
/// <summary>
/// Get unread emails from a date.
/// </summary>
/// <param name="date">date to retrieve emails from.</param>
/// <returns>Task containing a list of emails from a date.</returns>
public async Task <IEnumerable <Email> > GetEmailsFromDate(DateTimeOffset date)
{
_nextEmailPageRequest = _graphClient.Me.MailFolders.Inbox.Messages
.Delta()
.Request()
.Select("sender,subject,receivedDateTime,body,isread")
.Filter($"ReceivedDateTime gt {date.UtcDateTime.ToString("O")}");
return(await GetEmailsAsync());
}
/// <summary>
/// Initializes the NextPageRequest property.
/// </summary>
public void InitializeNextPageRequest(IBaseClient client, string nextPageLinkString)
{
if (!string.IsNullOrEmpty(nextPageLinkString))
{
this.NextPageRequest = new MessageDeltaRequest(
nextPageLinkString,
client,
null);
}
}
/// <summary>
/// Get the latest emails. This uses the delta token obtained from the last batch.
/// </summary>
/// <returns>Task containing list of the latest emails.</returns>
public async Task <IEnumerable <Email> > GetLatestEmails()
{
_nextEmailPageRequest = DeltaRequest();
_nextEmailPageRequest.QueryOptions.Add(new QueryOption("$deltatoken", GetEmailDeltaToken()));
return(await GetEmailsAsync());
}
/// <summary>
/// Get all the unread emails (since Jam 2019) and mark them as read.
/// </summary>
/// <returns>Task which contains list of unread emails. </returns>
public async Task <IEnumerable <Email> > GetAllEmails()
{
_nextEmailPageRequest = DeltaRequest();
return(await GetEmailsAsync());
}
/// <summary>
/// Update to the next set of pages.
/// </summary>
/// <returns>Task containing the next set of pages.</returns>
private async Task UpdatePages()
{
_curEmailPage = await _nextEmailPageRequest.GetAsync();
_nextEmailPageRequest = _curEmailPage.NextPageRequest;
}