c# - Order Dictionary from Keys from another Dictionary -

i have 2 dictionaries:

dictionary<string, tuple<t, t>> dict1 dictionary<enum, tuple<string, datetime, datetime>> dict2 

the string value in first item in tuple equal key in first dictionary. sort second dictionary enum value , sort first dictionary based on order dict2 has. how able while retaining other keys might in dict1? i'm able far sorting dictionary.

var positions = new dictionary<enum, string>(); //this foreach loop can simplified linq expression.                     foreach (var position in dict2)                     {                         var isfound = dict1.any(x => x.key == position.value.item1.value);                          if (isfound)                         {                             clubpositions.add(position.key, position.value.item1.value);                         }                     }                      var sortedpositions = positions.orderbydescending(x => x.key); 

the way understand question not sort first dictionary, able iterate elements in order defined second dictionary keys. if that's correct, following should trick:

var orderedkeys = new hashset<string>(dict2.orderby(e => e.key).select(e => e.value.item1)); var orderedentries = orderedkeys.where(dict1.containskey)     .select(key => new keyvaluepair<string, tuple<t, t>>(key, dict1[key]))     .concat(dict1.where(e => !orderedkeys.contains(e.key))); 

note put entries has no corresponding key last in order.