Accumulating Statistical Information in the BusinessProcess

• Add several members at the class level, to collect the statistical information we want

public class GetOrderStatistics : BusinessProcessBase
{
    readonly Models.Order_Details Order_Details = new Models.Order_Details();

    public GetOrderStatistics()
    {
        From = Order_Details;
    }
    public void Run(Number OrderId)
    {
        Where.Add(Order_Details.OrderID.IsEqualTo(OrderId));
        Execute();
    }
    Number _count = 0;
    Number _quantity = 0;
    Number _totalAmount = 0;
} 

• Note that we prefix their name with an "_" (underscore), that is the standard naming convention we use for private members
• Add an override to the OnLeaveRow method

Number _count = 0;
Number _quantity = 0;
Number _totalAmount = 0;
protected override void OnLeaveRow()
{
} 

• Add the code which collects our statistics in the OnLeaveRow method that gets executed for each row

Number _count = 0;
Number _quantity = 0;
Number _totalAmount = 0;
protected override void OnLeaveRow()
{
    _count++;
    _quantity += Order_Details.Quantity;
    _totalAmount += Order_Details.Quantity * Order_Details.UnitPrice;
} 

• Add a "Break Point" in the OnLeaveRow method and review the values of _count, _quantity and _totalAmount in the "watch" window

• Exercise Accumulating Statistic

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