使用SQL Server Compact在Windows Phone 8中的页面之间传递参数

我试图将参数从主页传递到另一页，但是我不知道应该输入什么变量。举个例子

NavigationService.Navigate(new Uri("/ToDoDetailPage.xaml?detail" + **variable** , UriKind.Relative)); 

我正在使用SQL Server compact 3.5，我想选择数据并将其传递到另一页。什么应该替换该变量，因为现在它只是一个空变量。这是我已完成的代码：

MainPage.xaml.cs

namespace PhoneApp
{
public partial class MainPage : PhoneApplicationPage
{
    // Constructor
    public MainPage()
    {
        InitializeComponent();

        // Set the data context of the LongListSelector control to the sample data
        DataContext = App.ViewModel;

        // Sample code to localize the ApplicationBar
        //BuildLocalizedApplicationBar();
    }

    // Load data for the ViewModel Items
    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        if (!App.ViewModel.IsDataLoaded)
        {
            App.ViewModel.LoadData();
        }

        using (DatabaseContext c = new DatabaseContext(DatabaseContext.ConnectionString))
        {
            c.CreateIfNotExists();
            c.LogDebug = true;
            //output todolist data from database
            MLongListSelector.ItemsSource = c.ToDoList.ToList();
        }
    }

    // Handle selection changed on LongListSelector
    private void MainLongListSelector_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        // If selected item is null (no selection) do nothing
        if (MLongListSelector.SelectedItem == null)
            return;

        // Navigate to the new page
        NavigationService.Navigate(new Uri("/ToDoDetailPage.xaml", UriKind.Relative));

        // Reset selected item to null (no selection)
        MLongListSelector.SelectedItem = null;
    }

   private void LongListSelector_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        var si = MainLongListSelector.SelectedItem as PhoneApp.ViewModels.ItemViewModel;

        if (MainLongListSelector.SelectedItem == null)
            return;

        if (si.LineOne.Equals("+ To Do List"))
            NavigationService.Navigate(new Uri("/todolistPage.xaml", UriKind.Relative));
        else if (si.LineOne.Equals("+ Reminder"))
            NavigationService.Navigate(new Uri("/reminderPage.xaml", UriKind.Relative));

        // Reset selected item to null (no selection)(//important)
        MainLongListSelector.SelectedItem = null;
    }

}
}

MainPage.xaml

<phone:Pivot Title="MY APPLICATION">
        <!--Pivot item one-->
        <phone:PivotItem Header="today">
            <!--Double line list with text wrapping-->
            <phone:LongListSelector x:Name="MLongListSelector" Margin="0,0,-12,0" SelectionChanged="MainLongListSelector_SelectionChanged">
                <phone:LongListSelector.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Margin="0,0,0,17">
                            <TextBlock Text="{Binding Title}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
                            <TextBlock Text="{Binding Description}" TextWrapping="Wrap" Margin="12,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}"/>
                        </StackPanel>
                    </DataTemplate>
                </phone:LongListSelector.ItemTemplate>
            </phone:LongListSelector>
        </phone:PivotItem>



        <!--Pivot item two-->
        <phone:PivotItem Header="activities">
            <phone:LongListSelector x:Name="MainLongListSelector" Margin="0,0,-12,0" ItemsSource="{Binding Items}" SelectionChanged="LongListSelector_SelectionChanged">
                <phone:LongListSelector.ItemTemplate>
                    <DataTemplate>
                        <StackPanel Margin="0,0,0,17">
                            <TextBlock Text="{Binding LineOne}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
                            <TextBlock Text="Hello" TextWrapping="Wrap" Margin="12,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}"/>
                        </StackPanel>
                    </DataTemplate>
                </phone:LongListSelector.ItemTemplate>
            </phone:LongListSelector>
        </phone:PivotItem>

    </phone:Pivot>

下面是断点的图像