private void button1_Click(object sender, EventArgs e)
{
Student_Select student_Select = new Student_Select(_StudentList.男生); //委託傳遞的方法(邏輯)，()裡 可以抽換邏輯，可以新增，不用修改
var result = _StudentList.Get_result(_StudentList.Get_newlist(), student_Select); //查詢結果(查詢清單，邏輯)
_StudentList.show(result);
}
//查詢
public List <Student> Get_result(List <Student> source, Student_Select student_Select)
{
List <Student> studentLists = new List <Student>();
foreach (var student in source)
{
if (student_Select.Invoke(student))
{
studentLists.Add(student);
}
}
return(studentLists);
}