How to filter a sub list which is part of another list in C# -

i want filter list part of list.

consider,

class mainclass

  properties        string name        string mainaddress        list<subclass> extrainfo 

class subclass

  properties        string address        string city        string phoneno 

now have 10 items in list , each item in list has 2 extrainfo items list items.

now want filter list items condition city == "new york".

so, 10 items in main list (list) should have extrainfo (list) items based on filter condition.

i mean want filter sub list not main list.

thanks in advance!

sample data name mainaddress extrainfo address city phone no
1. vimal bangalore north street new york 654564646 --->sub item 1 north street california 464654565 --->sub item 2

1. hareesh chennai north street washington 546466466 --->sub item 1 tower b new york 464645465 --->sub item 2

after filter (condition city == "new york"), should output in main list

 name      mainaddress       extrainfo                                 address        city        phone no       

1. vimal bangalore north street new york 654564646 --->sub item 1

1. hareesh chennai tower b new york 464645465 --->sub item 1

hope helps!

you have filter each of sublists:

list<mainclass> mainlist = ... foreach(mainclass main in mainlist) {     icollectionview view = collectionviewsource.getdefaultview(main.extrainfo);     view.filter = extrainfofilter; }  bool extrainfofilter(object obj) {     extrainfo item = (extrainfo)obj;      return item.city == "new york"; }