Question

I would like a lambda expression to get all my posts with a PublishDate in a specific month / year range (like 10/2011).

public IEnumerable<Post> SearchPosts(string periode)
{
    // periode may be 10/2011 so I would like all posts from 10/01/2011 to 10/31/2011
    return m_PostRepository.GetPosts().Where(x => x.PublishDate...?
}

Answer 1

You can also try it like this (working with PublishDate as Nullable<DateTime>):

DateTime date;
if (DateTime.TryParseExact(value, "MM/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.None, out date))
{
    var result = m_PostRepository.GetPosts().Where(x => x.PublishDate.HasValue && 
        x.PublishDate.Value.Month == date.Month && 
        x.PublishDate.Value.Year == date.Year).ToList();
}