Lazy用法

    public class StudentInfo 
    {
        public static StudentInfo studentLazy = new Lazy<StudentInfo>(() => new StudentInfo()).Value;
        public int StudentID{ get; set; }

    }


    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void Button_Click(object sender, RoutedEventArgs e)
        {
            StudentInfo.studentLazy.StudentID = 999;
        }

        private void Button1_Click(object sender, RoutedEventArgs e)
        {
            var test = StudentInfo.studentLazy.StudentID;
        }
    }