c# - Neat way of gettings position of my Object in linq collections -

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• how index using linq? [duplicate] 7 answers

i have object called week. week part of season object. season can contain many weeks. want find position of week (is first week in season (so #1) or second (so #2).

int = 0;         foreach ( var w in season.weeks.orderby(w => w.weekstarts)){             if(w.id == id){                 return i;             }             i+=1;         } 

at moment have. order weeks in second there start date make sure in correct order. , cycle through them until find week matches week looking at. , return int have been counting up..

i feel there should easier linq way feels pretty messy!

if prefer not write findindex extension method or load sorted items array / list, use overload of select provides index of item:

 return season.weeks               .orderby(w => w.weekstarts)               .select((week, index) => new { week = week, index = index })               .first(a => a.week.id == id)               .index; 

if there's no guarantee specified id exist, use firstordefault instead:

var weekindextuple = season.weeks                            .orderby(w => w.weekstarts)                            .select((week, index) =>                                      new { week = week, index = index })                            .firstordefault(a => a.week.id == id);  if(weekindextuple != null) {     return weekindextuple.index; } else {    // i'm not sure how want continue in case.    ...       }