Axapta - Why sometimes MultiSelectionHelper and why sometimes traditional read?

That's the  traditional way to read selected records from a grid:

 c = CustTable_DS.getFirst(true);
 while (c.RecId != 0)
 {
      info(c.Name);
      c = CustTable_DS.getNext();
 }

But there's a problem with this way. If user just wants to process records at line instead of select a couple of records unfortunately that record will be missed. That's the workaround for this symptom:


c = CustTable_DS.getFirst(true);
noSelected = true;
while (c.RecId != 0)
{
     noSelected = false;
     info(c.Name);
     c = CustTable_DS.getNext();
}
if  (noSelected)
    info(CustTable.Name);

MultiSelectionHelper solves this problem:

 MultiSelectionHelper helper = MultiSelectionHelper::construct();
CustTable c;
;
helper.parmDatasource(CustTable_ds);

c = helper.getFirst();
while (c.RecId != 0)
{
      info(c.Name);
      c = helper.getNext();
}


But there is a disadvantage for MultiSelectionHelper class too. If user wants to sort records at grid and wants to process with this sorted list we have to use traditional way again  because unfortunately MultiSelectionHelper doesn't care about users sort.

Using MultiselectionHelper from a class:

public static void main(Args _args)
{
    SMAServiceOrderTable    serviceOrder;
    MultiSelectionHelper    helper;
    FormRun                 caller = _args.caller();
    FormDataSource          SMAServiceOrderTable_DS;
  
    SMAServiceOrderTable_DS = caller.dataSource();
    helper = MultiSelectionHelper::createFromCaller(caller);
    helper.createQueryRanges(SMAServiceOrderTable_DS.queryBuildDataSource(),fieldStr(SMAServiceOrderTable,RecId));
    
    serviceOrder = helper.getFirst();
    
    while(serviceOrder)
    {
        info(strFmt("%1",serviceOrder.RecId));
        serviceOrder = helper.getNext();
    }
}

AXAPTA - Lookup and sort

When creating lookup you will see lookup won't run with your selected sort field:

public void lookup()
{
    SysTableLookUp          sysTableLookUp = SysTableLookup::newParameters(tablenum(SMARepairStage),RepairStageId);
    Query                   query = new Query();
    QueryBuildDataSource    qbds = query.addDataSource(tablenum(SMARepairStage));
        qbds.addSortField(fieldnum(SMARepairStage,Name));
        qbds.orderMode(OrderMode::OrderBy);
    sysTableLookup.addLookupfield(fieldnum(SMARepairStage,RepairStageId));
    sysTableLookup.addLookupfield(fieldnum(SMARepairStage,Name));
    sysTableLookup.parmQuery(query);
    sysTableLookup.performFormLookup();
}

If you may do this change, you will see your lookup how  do you want to do:

public void lookup()
{
    SysTableLookUp          sysTableLookUp = SysTableLookup::newParameters(tablenum(SMARepairStage),RepairStageId);
    Query                   query = new Query();
    QueryBuildDataSource    qbds = query.addDataSource(tablenum(SMARepairStage));
        qbds.addSortField(fieldnum(SMARepairStage,Name));
        qbds.orderMode(OrderMode::OrderBy);
    sysTableLookup.addLookupfield(fieldnum(SMARepairStage,RepairStageId));
    sysTableLookup.addLookupfield(fieldnum(SMARepairStage,Name));
    sysTableLookup.parmQuery(query);
    sysTableLookup.parmUseLookupValue(false);
    sysTableLookup.performFormLookup();
}