AX – D365FO – Loop through record from data source

///////////////////////////////////////////////
Using a while loop

SalesLine localSalesLine;
localSalesLine  = salesLine_ds.getFirst(true) as SalesLine;

if (localSalesLine)
{
    while (localSalesLine)
    {
        //Do your thing
         localSalesLine = salesLine_ds.getNext() as SalesLine;
    }
}

///////////////////////////////////////////////
Using a for loop

SalesLine localSalesLine;

for (localSalesLine = salesLine_ds.getFirst(true) ? salesLine_ds.getFirst(true) : salesLine_ds.cursor();
     localSalesLine;
     localSalesLine = salesLine_ds.getNext())
{       
     //Do your thing
}