I try to use LINQ to filter the data, the data is from 3rd party API (JIRA Server), and ResolutionDateis DateTime type, I guess it use Nullable, anyway, I am pretty sure the value is null, but when I use LINQ, it just not work at all. The LINQ just can't do i.ResolutionDate == null, it always said there is no item match this condition. I'm pretty sure I have the issues their ResolutionDate is null.
https://developer.atlassian.com/server/jira/platform/database-issue-fields/
var foo = datas.Where(i =>
i.Created > date && i.Created <= date.AddDays(7) &&
i.ResolutionDate> date.AddDays(7) && i.ResolutionDate== null);