Question

I am trying to write a LINQ statement with some optional where clauses. This is for a search. The user can select a specific site to search or search against all sites:

var query =
    _db.STEWARDSHIP
       .OrderBy(r => r.SITE.SITE_NAME)
       .Where(r => r.SITE_ID == SiteId)
       .Where(r => r.VISIT_TYPE_VAL.VISIT_TYPE_ID == VisitTypeId)
       .Select(r => new
       {
           id = r.STEWARDSHIP_ID,
           name = r.SITE.SITE_NAME,
           visit_type = r.VISIT_TYPE_VAL.VISIT_TYPE_DESC,
           visit_date = r.VISIT_DATE
       });
return query;  

So when the method gets SiteId = 14, for instance, no problem. However, when it gets SiteId = null, then that where clause should not be considered.

Thanks
Eric

Answer 1

Can’t you just edit the where clause to something like

 .Where(r=>SiteId == null || r.SiteId == SiteId)