c# - How can I dynamically change the condition of where, depending on the parameter -


i need write single query. depending on parameter regionid must hold 1 of conditions if parameter greater 0 regionid if parameter involved in request if there not involved.

 var myregionid = 0;                 if (!string.isnullorempty(regionid))                 {                     myregionid = int.parse(regionid);                 }                  iorderedqueryable price;                 if (myregionid>0)                 {                      price = (from p in _db.prices                                   join in _db.goods on p.good_id equals good.id                                   join gname in _db.spr_goods_names on good.goods_name_id equals gname.id                                   ******p.region_id == myregionid &&** gname.name.tolower().contains(filtertext.tolower())****                                   group p new{ p.good_id} g                                   select new                                   {                                       goodid = g.key.good_id,                                       promotion = g.count(x => x.promotion != ""),                                       minprice = g.min(x => x.good_price),                                       distributorcount = g.count(x => x.distributor_id != null)                                   }                             ).orderbydescending(x => x.distributorcount).take(100).orderby(x => x.minprice);                 }else                 {                     price = (from p in _db.prices                              join in _db.goods on p.good_id equals good.id                              join gname in _db.spr_goods_names on good.goods_name_id equals gname.id                              **where gname.name.tolower().contains(filtertext.tolower())**                              group p new { p.good_id } g                              select new                              {                                  goodid = g.key.good_id,                                  promotion = g.count(x => x.promotion != ""),                                  minprice = g.min(x => x.good_price),                                  distributorcount = g.count(x => x.distributor_id != null)                              }                            ).orderbydescending(x => x.distributorcount).take(100).orderby(x => x.minprice);                 }

how this?

 price = (from p in _db.prices           join in _db.goods on p.good_id equals good.id           join gname in _db.spr_goods_names on good.goods_name_id equals gname.id           (myregionid <= 0 || p.region_id == myregionid) && gname.name.tolower().contains(filtertext.tolower())           group p new{ p.good_id} g           select new           {               goodid = g.key.good_id,               promotion = g.count(x => x.promotion != ""),               minprice = g.min(x => x.good_price),               distributorcount = g.count(x => x.distributor_id != null)           }).orderbydescending(x => x.distributorcount).take(100).orderby(x => x.minprice);

if myregionid <= 0, evaluates true , p.region_id == myregionid not evaluated , ignored.


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