static void Main(string[] args)
{
Invoice i1 = new Invoice();
for (int i = 0; i < 2; i++)
{
i1.DetailLines.Add(new InvoiceDetailLine(i + 1));
}
i1.PrintInvoice();
Invoice i2 = new Invoice();
for (int i = 0; i < 2; i++)
{
i2.DetailLines.Add(new InvoiceDetailLine(i + 1));
}
Invoice summaryInvoice = i1 + i2;
Console.WriteLine("*** Summary Invoice for Invoices 1 & 2 ***");
summaryInvoice.PrintInvoice();
Console.ReadLine();
}
public static Invoice operator +(Invoice invoice1, Invoice invoice2)
{
Invoice returnInvoice = new Invoice();
foreach (InvoiceDetailLine detailLine in invoice1.DetailLines)
{
returnInvoice.DetailLines.Add(detailLine);
}
foreach (InvoiceDetailLine detailLine in invoice2.DetailLines)
{
returnInvoice.DetailLines.Add(detailLine);
}
return returnInvoice;
}
