Xaml 滚动视图框架。导航为空
我正在尝试从ScrollViewer控件导航到页面:Xaml 滚动视图框架。导航为空,xaml,windows-8,microsoft-metro,Xaml,Windows 8,Microsoft Metro,我正在尝试从ScrollViewer控件导航到页面: <Button x:Name="btnViewMenu" Content="View Menu" Click="btnViewMenu_Click" Margin="0,20,0,0" CommandParameter="{Binding}" Grid.Row="3" /> private void btnViewMenu_Click(object sender, RoutedEventArgs e) {
<Button x:Name="btnViewMenu" Content="View Menu" Click="btnViewMenu_Click" Margin="0,20,0,0" CommandParameter="{Binding}" Grid.Row="3" />
private void btnViewMenu_Click(object sender, RoutedEventArgs e)
{
Button btn = (Button)sender;
RestaurantLocation loc = btn.CommandParameter as RestaurantLocation;
App.CurrentRestaurantLocation = loc;
this.Frame.Navigate(typeof(SearchFormPage));
}
私有无效btnViewMenu_单击(对象发送方,路由目标)
{
按钮btn=(按钮)发送器;
RestaurantLocation loc=btn.CommandParameter作为RestaurantLocation;
App.CurrentRestaurantLocation=loc;
this.Frame.Navigate(typeof(SearchFormPage));
}
在搜索表单页面上,我发现以下错误:
_pageKey不能为空:
/// <summary>
/// Invoked when this page will no longer be displayed in a Frame.
/// </summary>
/// <param name="e">Event data that describes how this page was reached. The Parameter
/// property provides the group to be displayed.</param>
protected override void OnNavigatedFrom(NavigationEventArgs e)
{
var frameState = SuspensionManager.SessionStateForFrame(this.Frame);
var pageState = new Dictionary<String, Object>();
this.SaveState(pageState);
frameState[_pageKey] = pageState;
}
//
///当此页面不再显示在框架中时调用。
///
///描述如何到达此页面的事件数据。参数
///属性提供要显示的组。
受保护的覆盖无效OnNavigatedFrom(NavigationEventArgs e)
{
var frameState=SuspensionManager.SessionStateForFrame(this.Frame);
var pageState=新字典();
这个.SaveState(pageState);
frameState[_pageKey]=页面状态;
}
我航行不正常吗?这只发生在scrollviewer中。谢谢。我必须调用基本方法:
protected override void OnNavigatedTo(NavigationEventArgs e)
{
base.OnNavigatedTo(e);
List<string> theResults = e.Parameter as List<string>;
city = theResults[0];
state = theResults[1];
category = theResults[2];
BindData();
}
受保护的覆盖无效OnNavigatedTo(NavigationEventArgs e)
{
基地。导航到(e);
列出结果=e.参数作为列表;
城市=结果[0];
状态=结果[1];
类别=结果[2];
BindData();
}
确保您有一个呼叫base.OnNavigatedTo(e)和base.OnNavigatedFrom(e)
在执行逻辑后的重写方法中这是否适用