我正在开发一个小游戏类型的应用程序,当用户赢得游戏时,他将获得弹出窗口作为胜利,我编写了以下代码。
public void stoptimer()
{
if ((Convert.ToString(b1.Content) == "1") && (Convert.ToString(b2.Content) == "2") && (Convert.ToString(b3.Content) == "3") && (Convert.ToString(b4.Content) == "4") && (Convert.ToString(b5.Content) == "5") && (Convert.ToString(b6.Content) == "6") && (Convert.ToString(b7.Content) == "7") && (Convert.ToString(b8.Content) == "8") && (Convert.ToString(b9.Content) == "9") && (Convert.ToString(b10.Content) == "10") && (Convert.ToString(b11.Content) == "11") && (Convert.ToString(b12.Content) == "12") && (Convert.ToString(b13.Content) == "13") && (Convert.ToString(b14.Content) == "14") )
{
newTimer.Stop();
time = txtClock.Text;
//textBox2.Text = txtClock.Text;
Popup buyNowScreen;
buyNowScreen = new Popup();
buyNowScreen.Child =
new popupscreen
();
buyNowScreen.IsOpen = true;
buyNowScreen.VerticalOffset = 100;
buyNowScreen.HorizontalOffset = 25;
}
}
我编写了以下代码,用于从弹出页面导航到其他页面,但是它无法获取NullReferenceException。
private void button3_Click(object sender, RoutedEventArgs e)
{
ClosePopup();
NavigationService.Navigate(new Uri("/Menu.xaml", UriKind.Relative));
}
private void button1_Click(object sender, RoutedEventArgs e)
{
ClosePopup();
NavigationService.Navigate(new Uri("/NumericEasy.xaml", UriKind.Relative));
}
private void ClosePopup()
{
Popup buyPop = this.Parent as Popup;
if (buyPop.IsOpen)
{
buyPop.IsOpen = false;
}
}
答案 0 :(得分:1)
导航服务在页面之间起作用,你不能使用如此简单的弹出窗口。该服务无法找到,使用哪个页面,这就是它抛出异常的原因。
要解决您的问题,您应该这样做:
弹出类
1)在你的弹出构造函数中,你应该得到PhoneApplicationPage对象。
private PhoneApplicationPage _page;
public SomePopup(PhoneApplicationPage page)
{
_page = page;
2)您应该为点击事件创建一个新类型。
public delegate void NavigateHandler(object sender, EventArgs e, PhoneApplicationPage page);
public event NavigateHandler NavigateFromPopup;
3)在你的button_click事件中你应该调用它:
public void ButtonX_Click(object sender, RoutedEventArgs e)
{
if (NavigateFromPopup!= null)
NavigateFromPopup(this, EventArgs.Empty, _page);
}
您的网页课程
4)在您的页面上,当您创建弹出窗口时,您应该添加此eventHandler:
SomePopup p = new SomePopup(this);
p.NavigateFromPopup +=new SomePopup.NavigateHandler(p_NavigateFromPopup);
5)最后,在你的页面上你应该记下这个事件:
private void p_NavigateFromPopup(object sender, EventArgs e, PhoneApplicationPage page)
{
page.NavigationService.Navigate(new Uri("...", UriKind.RelativeOrAbsolute));
}
这应该有效。
答案 1 :(得分:1)
以下是为弹出页面控件提供事件的过程。
Popup buyNowScreen=new Popup();
popupscreen popup1=new popscreen();
buyNowScreen.Child =popup1;
buyNowScreen.isOpen=true;
popup1.button1.click+= new RoutedEventHandler(btn_playagain_click);
private void btn_playagain_click(object sender, EventArgs e)
{
p.IsOpen = false;
NavigationService.Navigate(new Uri("/NumericEasy.xaml?Refresh=true", UriKind.Relative));
}