c# - Get maximum value from Dictionary -

i have dictionary of type

dictionary<int, gvalue>  

where gvalue object contains 2 double values p1 , p2

how can max p1 , p2 dictionary?

i have tried far

c.calculategraphmetrics(nodexlcontrol1.graph).max(s => s.value.p1); 

it gives me no error, result shows on debug

expression cannot contain lambda expressions 

re. getting key corresponding maximum value: see lot of complicated implementations of maxby when can use 1 of overloads of aggregate similar effect:

var keyformaxp1 = dict.keys.aggregate((i, j) => dict[i].p1 >= dict[j].p1 ? : j); var keyformaxp2 = dict.keys.aggregate((i, j) => dict[i].p2 >= dict[j].p2 ? : j); 

edit: if want multiple maximum keys, you'll need like

var allmaxkeysforp1 = dict.keys.aggregate(     new { value = double.negativeinfinity, keys = new list<int>() },     (a, k) =>         {             if (a.value > dict[k].p1) return a;             if (a.value.equals(dict[k].p1))             {                 a.keys.add(k);                 return a;             }             return new { value = dict[k].p1, keys = new list<int> { k } };         },     => a.keys); 

at point might want consider implementing allmaxby method.