//主界面点击到达stuMainHomework界面的点击事件
private void btnStuMainHomework_Click(object sender, RoutedEventArgs e)
{
Button mf = (Button)sender;
StuMainHomework smh = new StuMainHomework(account, name, (String)mf.Tag, pngfile); //调用构造函数进行界面创建，真实课堂号
smh.pngfile = this.pngfile; //给下一个界面头像传值
smh.Show(); //下一个界面的展示
this.Visibility = Visibility.Hidden; //上一个界面的隐藏
}
private void btnReturn_Click(object sender, RoutedEventArgs e)
{
if (true)//里面是验证函数
{
// 打开子窗体
StuMainHomework smh = new StuMainHomework(account, name, classId, pngfile);
smh.pngfile = this.pngfile;
smh.Show();
// 隐藏自己(父窗体)
this.Visibility = System.Windows.Visibility.Hidden;
}
}