public static void T()
{
ISalary <PP> s = new BaseSalaryCounter <PP>();
ISalary <MM> t = new BaseSalaryCounter <MM>();
PrintSalary(s);
PrintSalary(t);
}
private void Form1_Load(object sender, EventArgs e)
{
//1. 讓代碼支持協變
ISalary <Programmer> s = new BaseSalaryCounter <Programmer>();
ISalary <Manage> t = new BaseSalaryCounter <Manage>();
PrintSalary(s);
PrintSalary(t);
//2. 為何IList可以用List 進行協變，是因為 => IEnumerable<out T> 本身就使用out T
IList <Programmer> iList = new List <Programmer>();
PrintPersonName(iList);
}
public void Test01()
{
ISalary <Programmer> p = new BaseSalaryCounter <Programmer>();
PrintSalary1(p);
}
