private void button1_Click(object sender, EventArgs e)
{
double UnitPrice = double.Parse(textBox1.Text);
double Quantity = double.Parse(textBox2.Text);
string CalculateMethod = comboBox1.SelectedItem.ToString();
CashSuper cs = CashFactory.CreateCashFactory(CalculateMethod);
double TotalPrice = cs.AcceptCash(UnitPrice * Quantity);
string FinalResult;
FinalResult = String.Format("Unit Price = {0}, Quanity = {1}, Calculate Method = {2}, Total Price = {3}"
, UnitPrice
, Quantity
, CalculateMethod
, TotalPrice);
richTextBox1.AppendText(FinalResult);
richTextBox1.AppendText("\n");
}
public CashContext(string acceptStrategy)
{
//所有收费模式均继承自CashSuper类，重写抽象方法：acceptCash
switch (acceptStrategy)
{
case "正常收费":
cs = new CashNormal();
break;
case "满300返100":
cs = new CashReturn("300", "100");
break;
case "打八折":
cs = new CashRebate("8");
break;
case "打七折":
cs = new CashRebate("7");
break;
case "打五折":
cs = new CashRebate("5");
break;
}
}
public static CashSuper CreateCashFactory(string CalculateString)
{
CashSuper CashSuperBuffer = null;
switch (CalculateString)
{
case "Normal":
CashSuperBuffer = new CashNormal();
break;
case "10% off":
CashOFF co = new CashOFF("0.9");
CashSuperBuffer = co;
break;
case "20% off":
CashOFF co1 = new CashOFF("0.8");
CashSuperBuffer = co1;
break;
}
return(CashSuperBuffer);
}
