Search filters not working when using AND operator on EWS?

Question

I am trying to filter through emails using two filters: emails sent TODAY and emails from a specific recipient. I tried the following approach:

DateTime searchdate = DateTime.Today;
SearchFilter greaterthanfilter = new SearchFilter.IsGreaterThanOrEqualTo(ItemSchema.DateTimeReceived, searchdate);
SearchFilter lessthanfilter = new SearchFilter.IsLessThan(ItemSchema.DateTimeReceived, searchdate.AddHours(24));
SearchFilter senderFilter = new SearchFilter.IsEqualTo(EmailMessageSchema.From, "some-email-here@keyman .com");
SearchFilter dateFilter = new SearchFilter.SearchFilterCollection(LogicalOperator.And, greaterthanfilter, lessthanfilter);
SearchFilter allFilters = new SearchFilter.SearchFilterCollection(LogicalOperator.And, dateFilter, senderFilter);
Folder folder = Folder.Bind(service, WellKnownFolderName.Inbox);
FindItemsResults<Item> results = folder.FindItems(allFilters, new ItemView(50));
foreach(Item i in results)
{
Console.WriteLine(i.Subject);
}
If I use the filters separately, everything works fine. I either get the emails filtered by the sender or the emails filtered by the received date. If I change the LogicalOperator to OR, everythings works great as well. For some reason, when I add the LogicalOperator.And, no emails are returned.

If you know a better way, please let me know!

Answer 1

When you use the LogicalOperator.And to combine multiple search filters, you are asking for items that satisfy all of the specified conditions simultaneously. In your case, you want to filter emails that are both sent today (DateTimeReceived falls within today's date range) and from a specific sender. It's possible that there are no emails that meet both criteria, which is why you're not getting any results.