我正在構建一個WP7應用程序,該應用程序由第一頁中的一個列表框組成,以顯示多個任務的標識以及顯示每個任務(選定)的詳細信息的詳細信息頁面。ListBox的SelectionChanged事件。在頁面之間傳遞參數
我需要將任務ID從第一頁傳遞到第二頁。我知道它是由ListBox的SelectionChanged事件執行的。
這是我的XAML代碼:
<phone:PhoneApplicationPage
x:Class="TaskListAlpha03.MainPage"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="696"
FontFamily="{StaticResource PhoneFontFamilyNormal}"
FontSize="{StaticResource PhoneFontSizeNormal}"
Foreground="{StaticResource PhoneForegroundBrush}"
SupportedOrientations="Portrait" Orientation="Portrait"
shell:SystemTray.IsVisible="True"
xmlns:controls="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls">
<phone:PhoneApplicationPage.Resources>
<DataTemplate x:Key="TaskListListBoxTemplate">
<StackPanel Orientation="Vertical" Margin="0,0,0,20">
<TextBlock Text="{Binding Crm_object_id}" FontSize="32" FontFamily="Segoe WP Bold" Foreground="Gray"/>
<!--<TextBlock Text="{Binding Comment}" Margin="10,0,0,0"/> -->
</StackPanel>
</DataTemplate>
</phone:PhoneApplicationPage.Resources>
<!--LayoutRoot is the root grid where all page content is placed-->
<Grid x:Name="LayoutRoot" Background="Transparent">
<Grid.RowDefinitions>
<RowDefinition Height="Auto"/>
<RowDefinition Height="*"/>
</Grid.RowDefinitions>
<!--TitlePanel contains the name of the application and page title-->
<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,40">
<TextBlock x:Name="ApplicationTitle" Text="TASK LIST ALPHA" Style="{StaticResource PhoneTextNormalStyle}"/>
<TextBlock x:Name="PageTitle" Text="tasks" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
</StackPanel>
<!--ContentPanel - place additional content here-->
<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">
<ListBox
x:Name="allTaskListTasksListBox"
ItemsSource="{Binding AllTaskListTasks}"
ItemTemplate="{StaticResource TaskListListBoxTemplate}"
SelectionChanged="allTaskListTasksListBox_SelectionChanged" />
</Grid>
</Grid>
</phone:PhoneApplicationPage>
這是CS代碼:
private void allTaskListTasksListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
ListBoxItem lbi = ((sender as ListBox).SelectedItem as ListBoxItem);
NavigationService.Navigate(new Uri("/View/Details.xaml?msg=" + lbi.Content.ToString(), UriKind.RelativeOrAbsolute));
}
在第二頁我有這樣的示例代碼,檢查是否正常工作:
protected override void OnNavigatedTo
(System.Windows.Navigation.NavigationEventArgs e)
{
base.OnNavigatedTo(e);
string msg = "";
if (NavigationContext.QueryString.TryGetValue("msg", out msg))
PageTitle.Text = msg;
}
當我執行應用程序時,我有一個「NullReferenceException」。
對不起,我的英語:S和謝謝。
非常感謝你;) – javiazo 2012-03-13 16:33:43
我已經使用了你的第二個技巧和工作正常,坦克 – javiazo 2012-03-13 16:34:24