c# - Array-List not contains -

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i have list 2 attributs/objects. first int-array 2 ids.

i want add new object list, if value 12 and 21 (only in combination) not exist in ids-array of hole list. //if 1 single id found okay - combination of both ids needs jump else-case. :)

*12 , 21 vars later, no static values

i don't know why, isn't working...

if (id != destination.id && !(thisdistances.exists(x => x.ids.contains(12)) && thisdistances.exists(x => x.ids.contains(21)))) { ... }

public class distancedata {     public int[] ids;     public int distance; }  protected void makedistances(int id, double geolat, double geolon, int limit = 100) {     int = 0;     list<distancedata> thisdistances = new list<distancedata>();     foreach (var destination in destinations)     {         if (id != destination.id && !(thisdistances.exists(x => x.ids.contains(12)) && thisdistances.exists(x => x.ids.contains(21))))         {             thisdistances.add(new distancedata()             {                 ids = new int[2] { id, destination.id },                 distance = (int)math.round(6378388 * math.acos(math.sin(geolat) * math.sin(destination.geolat) + math.cos(geolat) * math.cos(destination.geolat) * math.cos(destination.geolon - geolon)), 0, midpointrounding.awayfromzero)             });             if (++i > 10) break;         }     }     thisdistances = thisdistances.orderby(x => x.distance).take(limit).tolist();     foreach (var thisdistance in thisdistances)     {         response.write("<i><b>" + thisdistance.distance + "</b> (" + thisdistance.ids[0] + "," + thisdistance.ids[1] + ")</i><br />");     } }

how can check, both ids not in ids-array of objectlist?

try one:

foreach (var destination in destinations) {     if (id != destination.id && (thisdistances.exists(x => x.ids.contains(12) && x.ids.contains(21)) == false))     {         thisdistances.add(new distancedata()         {             ids = new int[2] { id, destination.id },             distance = (int)math.round(6378388 * math.acos(math.sin(geolat) * math.sin(destination.geolat) + math.cos(geolat) * math.cos(destination.geolat) * math.cos(destination.geolon - geolon)), 0, midpointrounding.awayfromzero)         });         if (++i > 10) break;     } }

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