Search based on a set of keywords

Question

I need to make a search based on a set of keywords, that return all the Ads related with those keywords. Then the result is a list of Categories with the Ads Count for each

Answer 1

this may not be the direct answer, but in such "multiple parameter search" situations i just forget about anything and do the simple thing, for ex: Search By Car Manufacturer, CategoryId, MillageMax, Price :

var searchResults = from c in carDb.Cars
where (c.Manufacturer.Contains(Manufacturer) || Manufacturer == null) &&
                 (c.CategoryId == CategoryId || CategoryId == null) &&
                    (c.Millage <= MillageMax || MillageMax== null) &&
                          (c.Price <= Price  || Price == null) 
select c

now if any of the parameters is null it cancels the containing line by making the whole expression in brackets True and so it does not take a part in search any more