NavigationService.Navigate is nothing

Question

Hi,

I am newbie of Silverlight.

I am try to navigate from Page1.xaml to Page2.xaml by statement

NavigationService.Navigate(New Uri("/Page2.xaml", UriKind.Relative))

it said NavigationService is nothing

Anyone Could help me?

Thank you!

Francis SZE

Answer 1

Hi ,

   If you want to use the Navigation service, you can use Frame to load the Page1 , and from then onwards, you will not have any problem  using NavigationService.  If you dont use a frame, then you get Object reference not set exception for the NavigationService.

Here is my Code anyway. 

SilverlightControl1.xaml

<UserControl x:Class="SilverlightApplication7.SilverlightControl1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400"
    xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk">
    
    <Grid x:Name="LayoutRoot" Background="White">
        <sdk:Frame Height="225" HorizontalAlignment="Left" Margin="25,43,0,0" Name="frame1" VerticalAlignment="Top" Width="338" />
    </Grid>
</UserControl>

SilverlightControl1.xaml.cs

namespace SilverlightApplication7
{
    public partial class SilverlightControl1 : UserControl
    {
        public SilverlightControl1()
        {
            InitializeComponent();
            frame1.Source = new Uri("/Page1.xaml", UriKind.RelativeOrAbsolute);
        }
    }
}

 

Page1.xaml

<navigation:Page x:Class="SilverlightApplication7.Page1" 
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="Page1 Page">
    <Grid x:Name="LayoutRoot">
        <Button Content="Button" Height="23" HorizontalAlignment="Left" Margin="191,134,0,0" Name="button1" VerticalAlignment="Top" Width="75" Click="button1_Click" />
    </Grid>
</navigation:Page>

 

Page1.xaml.cs

namespace SilverlightApplication7
{
    public partial class Page1 : Page
    {
        public Page1()
        {
            InitializeComponent();
        }

        // Executes when the user navigates to this page.
        protected override void OnNavigatedTo(NavigationEventArgs e)
        {
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            NavigationService.Refresh();
            NavigationService.Navigate(new Uri("/Page2.xaml", UriKind.RelativeOrAbsolute));
        }

    }
}

 

Page2.xaml

<navigation:Page x:Class="SilverlightApplication7.Page2" 
           xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
           xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
           xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
           xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
           mc:Ignorable="d"
           xmlns:navigation="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Navigation"
           d:DesignWidth="640" d:DesignHeight="480"
           Title="Page2 Page" xmlns:sdk="http://schemas.microsoft.com/winfx/2006/xaml/presentation/sdk">
    <Grid x:Name="LayoutRoot">
        <sdk:Label Height="28" HorizontalAlignment="Left" Content="This is page 2" Margin="156,129,0,0" Name="label1" VerticalAlignment="Top" Width="120" />
    </Grid>
</navigation:Page>

 It is working on my machine.    Hope it Helps  

Answer 2

Hi Phani Kiran Challa,

I don't want to use frame.

But goto page2.xaml by NavigationService.Navigate(New Uri("/Page2.xaml", UriKind.Relative)) on button_onclick event...

a way can do this?

Thank you!

Answer 3

Hi ,

Without using a Frame , you cant use NavigationService .  

Alternatively, instead of using NavigationService then,  you could just write    this.Content = new Page2();    in that button click event, which will also take you to your Page2. 

Hope it Helps