private void metroTile3_Click(object sender, EventArgs e)
{
frmStudent f = frmStudent.Instacne();
//f.MdiParent = this;
f.Show();
f.Focus();
}
private void 学生信息ToolStripMenuItem_Click(object sender, EventArgs e)
{
frmStudent f = frmStudent.Instacne();
f.MdiParent = this;
f.Show();
f.Focus();
}
public static frmStudent Instacne()
{
if (_Instance == null)
{
_Instance = new frmStudent();
}
return(_Instance);
}