Generic column filter dataTableJquery server side

i am trying to implement a generic column filter based on the link (https://www.echosteg.com/jquery-datatables-asp.net-mvc5-server-side")

for exemple in the controller we would like to filter i have this method

  public Dictionary<string,string> ColumnRequestAangifte()
    {

        var _IDCOLUMN = Request.Form.GetValues("columns[0][search][value]").FirstOrDefault();


        columnName.Add("_IDCOLUMN", _IDCOLUMN);
        var VAL_IDCOLUMN = Request.Form.GetValues("columns[1][search][value]").FirstOrDefault();
        columnName.Add("VAL_IDCOLUMN", EVAL_IDCOLUMN);



    }

used to give parmeter to the filter controller dictColumns my problems how to i know the miscellenous property of p as p is coming from v and v is Generic list

public class FilterController : Controller
    {
        // GET: Filter

        public IQueryable<T> FilterList<T>(Dictionary<string,string> dictColumns)
        {
            List<T> v = new List<T>();
            var search = Request.Form.GetValues("search[value]").FirstOrDefault();
            int count = 0;
            var results = v.AsQueryable();
            foreach (KeyValuePair<string,string> item in dictColumns)
            {
                var t = item.Key;
                t = Request.Form.GetValues("columns["+count+"][search][value]").FirstOrDefault();
                count++;
                results = results.Where
             (
                    //p.? this is where i ma struggling 
               p => (search == null || (p. != 0 && p..ToString().ToLower().Contains(search.ToLower())))
                && (t == null || (p. != 0 && p..ToString().ToLower().Contains(t.ToLower())))
                );

            }

            return results;
        }
    }
}