winform子窗口关闭后，父窗口重新打开

父窗口   Main

//学生档案管理
        private void button1_Click(object sender, EventArgs e)
        {
            this.Enabled = false;//当前窗体不可用

            StudentInfo si = new StudentInfo(this);//初始化要打开的窗体，Form1为要打开的窗体的类名。

            si.ShowDialog();//显示新的窗体。

        }

 

子窗口StudentInfo

public partial class StudentInfo : Form
    {
        Main main;

        public StudentInfo(Main main)
        {
            InitializeComponent();

            this.main = main;
        }
    private void StudentInfo_FormClosed(object sender, FormClosedEventArgs e)
        {
            main.Enabled = true;
        }

       
    }