小编Mik*_*uki的帖子

我收到了一个错误Object reference not set to an instance of an object.我想我不会初始化一些东西.

这是代码; 错误在线if (btn.Background.Equals(new SolidColorBrush(Color.FromArgb(0, 0, 0, 0)))):

private void vbOpenGuiaMaestro_Tapped(object sender, TappedRoutedEventArgs e)
{
    Button btn = default(Button);
    if (btn.Background.Equals(new SolidColorBrush(Color.FromArgb(0, 0, 0, 0))))
    {
         btn.Background = materiaColor;
         btn.Foreground = new SolidColorBrush(Color.FromArgb(255, 255, 255, 255));
         stckTeachersGuideClosed.Visibility = Visibility.Visible;
         stckTeachersGuideOpened.Visibility = Visibility.Collapsed;
    }
    else
    {
         btn.Background = new SolidColorBrush(Color.FromArgb(0, 0, 0, 0));
         btn.Foreground = new SolidColorBrush(Color.FromArgb(255, 140, 140, 140));
    }
 }

我需要验证用户需要设置最小值,1个上限,1个下限和1个特殊字符...我只是验证用户需要最少6个字母或更多...

try
{
    string actualPass = this.txtactualPass.Text;
    string newPass = this.txtnewPass.Text;
    string reEnterPass = this.txtReEnterPass.Text;

    if (actualPass == this.Session["password"].ToString())
    {
        if (newPass.Length >= 6)
        {