List <Person> person = new List <Person>();
Person p1 = new Person("張三", 26, Gender.Male, "看書");
Person p2 = new Person("張四", 55, Gender.Male, "釣魚");
List <Student> stu = new List <Student>();
Student s1 = new Student("李四", 26, Gender.Male, "電影", "S2T11");
Student s2 = new Student("李五", 20, Gender.Male, "電腦", "S2T11");
List <Teacher> tch = new List <Teacher>();
Teacher t1 = new Teacher("王五", 26, Gender.Male, "音樂", "S1,S2,Y2");
Teacher t2 = new Teacher("王六", 30, Gender.Male, "音樂", "S1,S2");
person.Add(p1);
person.Add(p2);
person.Add(s1);
person.Add(s2);
person.Add(t1);
person.Add(t2);
/////////////用for遍曆出Student類型和Teacher類型///////////////////
for (int i = 0; i < person.Count; i++)
{
if (person[i] is Student)
{
((Student)person[i]).SayHi();
}
else if (person[i] is Teacher)
{
((Teacher)person[i]).SayHi();
}
}
========================================
用foreach來遍曆出Student類型和Teacher類型 替換上面for的遍曆
========================================
基類 Person 子類 Student Teacher
static void Main(string[] args)
{
List <Person> person = new List <Person>();
Person p1 = new Person("張三", 26, Gender.Male, "看書");
Person p2 = new Person("張四", 55, Gender.Male, "釣魚");
Person s1 = new Student("李四", 26, Gender.Male, "電影", "S2T11");
Person s2 = new Student("李五", 20, Gender.Male, "電腦", "S2T11");
Person t1 = new Teacher("王五", 26, Gender.Male, "音樂", "S1,S2,Y2");
Person t2 = new Teacher("王六", 30, Gender.Male, "音樂", "S1,S2");
person.Add(p1);
person.Add(p2);
person.Add(s1);
person.Add(s2);
person.Add(t1);
person.Add(t2);
//for (int i = 0; i < person.Count; i++)
//{
// if (person[i] is Student)
// {
// ((Student)person[i]).SayHi();
// }
// else if (person[i] is Teacher)
// {
// ((Teacher)person[i]).SayHi();
// }
//}
foreach (Person p in person)
{
if (p is Student)
{
p.SayHi();
}
else if (p is Teacher)
{
p.SayHi();
}
}
Console.ReadLine();
}
或者:這樣。。。。。。。。。。
if (p is Student)
{
p.SayHi();
}
else if (p is Teacher)
{
p.SayHi();
}