c# - Nerd Dinner pagginated list - how do I add a linq orderby clause dynamicaly? ANYONE? -

i have implemented nerd dinner method of paging- works great. want able dynamically able order certian fields.

how go implementing this. here code?

controller:

 paginatedlist<classifieds_ads> pageofclassifieds = new paginatedlist<classifieds_ads>(classifiedsrepositry.getclassifiedsincategory(category), paging, 20); 

repository:

    return classifieds in context.classifieds_ads.include("user")            (from catergory in context.classifieds_categories                   catergory.mvc_url == mvc_cat                    select catergory).contains(classifieds.classifieds_categories)             orderby classifieds.dateposted descending            select classifieds; 

as can see have orderby clause "hard coded" repository. don't know code implement dynamically?

anybody have ideas?

thanks,

you can use orderby(of tsource, tkey)-extensionmethod , pass custom function via keyselector-parameter. maybe little example may give idea how start:

    class     {         public string foo { get; set; }         public int32 bar { get; set; }         public override string tostring()         {             return foo + ":" + bar.tostring();         }     }      static void main(string[] args)     {         var x = new list<a> { new { foo = "abc", bar = 100 }, new a() { foo = "zzz", bar = 0 } };         func<a, string> order1 = (a) => a.foo;         func<a, int32> order2 = (a) => a.bar;          printquery(x, order1);         console.writeline();         printquery(x, order2);         console.readline();     }      static void printquery<t>(ienumerable<a> query, func<a, t> orderfunc)     {         foreach (var e in query.orderby(orderfunc))             console.writeline(e);     }