//具体请求处理方法
public override void processRequest(PurchaseRequest request)
{
if (request.getAmount() < 500000)
{
Console.WriteLine("董事长" + this.name + "审批采购单：" + request.getNumber() + "，金额：" + request.getAmount() + "元，采购目的：" + request.getPurpose() + "。"); //处理请求
}
else
{
this.successor.processRequest(request); //转发请求
}
}
//具体请求处理方法
public override void processRequest(PurchaseRequest request)
{
Console.WriteLine("召开董事会审批采购单：" + request.getNumber() + "，金额：" + request.getAmount() + "元，采购目的：" + request.getPurpose() + "。"); //处理请求
}