List paging mode, generic paging Mode

List

   Protected  List  <  T  >  Listpager  <  T  >  (List  <  T  >  Datasource,  Int Currentpageindex,  Int  Pagesize,  String  Filterexpression,  Ref     Int  Count)
{
Count  =     0  ;
  If  (Datasource  =    Null     |  Datasource. Count  =     0  )
  Return  Datasource;
Count  =  Datasource. count;
  If  (  String . Isnullorempty (filterexpression ))
{
  Int  Startindex  =  Currentpageindex  *  Pagesize;
  If  (Startindex  +  Pagesize  >  Datasource. Count)
{
Pagesize  =  Datasource. Count -  Startindex;
}
  Return  Datasource. getrange (startindex, pagesize );
}
  Else  
{
Datatable dt  =  Kinglib. datahelper. listtodatatable  <  T  >  (Datasource );
Dataview dv  = DT. defaultview;
DV. rowfilter  =  Filterexpression;
List  <  T  >  Newdatasource  =  Kinglib. datahelper. datatabletolist  <  T  >  (DV. totable ());
Count  =  Newdatasource. count;
 Int  Startindex  =  Currentpageindex  *  Pagesize;
  If  (Startindex  +  Pagesize  >  Newdatasource. Count)
{
Pagesize  =  Newdatasource. Count  - Startindex;
}
  Return  Newdatasource. getrange (startindex, pagesize );
}
}