c# - How do I write a Dynamic LINQ query and have Orderby [Sort Direction] -

i write linq query similar sql query:

select id, title, description, date sometable

and add 'orderby' , 'ascending/descending' dynamically.

i need add sort functionality on gridview, datasource linq query.

you write own sortby extension method takes sortdirection.

public enum sortdirection { ascending, descending }  public static class extensions {     public static ienumerable<tsource> sortby<tsource, tkey>(         ienumerable<tsource> source,         sortdirection sortdirection,         func<tsource, tkey> keyselector)     {         switch (sortdirection)         {             case sortdirection.ascending:                 return source.orderby(keyselector);             case sortdirection.descending:                 return source.orderbydescending(keyselector);             default:                 throw new argumentoutofrangeexception();         } } 

usage

var sortdirection = sort.descending; // set dynamically @ runtime var sorted = new[] { 1, 2, 3 }.sortby(sortdirection.descending, x => x);