Xamarin navigate to page throws "Object reference not set to an instance of an object."

tim 200

I'm trying to navigate and pass data to an edit page when I select a row.

I select a row in the checklistpage and what to pass that rows data to the treeinfopage. (has two points of entry 1 from menu and 1 from ChecklistPage)

the page structures are as follows:

treeInfoPage.xaml

treeInfoPage.xaml.cs

treeInfoPageModel.cs

checklistpageModel.cs

    private INavigationService _navigationService;

// not sure if this should be ChecklistpageModel or Checklistpage or Treeinfo...

    public void TreeInfoPageModel(INavigationService navigationService)

    {

        _navigationService = navigationService;           

    }

    public async void OnEditCommandAction(object SelectedObj)

    {          

        var treeInfoPage = new TreeInfoPage();

        treeInfoPage.BindingContext = SelectedObj;

     // everything work till the here , then the Object reference not set is thrown.

        await _navigationService.NavigateToAsync<TreeInfoPageModel>();

       /*tried the following, which in debug mode, will execute the TreeInfoPageModel code and Sector get set with show that the data is being passed but If I select the TreeInfoPage from the menu, the fields are empty, I assume that from the menu the data is cleared and the navigation is what is needed */

       // var pd2pm = new TreeInfoPageModel((CheckListItem)SelectedObj);

        return;

    }

TreeInfoPageModel.cs

public TreeInfoPageModel(CheckListItem data)

    {

        StatusMsg = "Ready";

        WorkTreeLocationItems = new ObservableCollection<WorkTreeLocationItem>();

        SaveLocationDataModel = new ButtonModel("Save Data", OnSaveLocationDataAction);

        Close_App_Clicked = new ButtonModel("Close App", CloseAppAction);

// prevents field from filling with 0 when entry from menu.

        if (data.TreeNumber > 0)

        {

            StatusMsg = data.Sector.ToString();

            Sector = data.Sector.ToString();

Thanks

Tim

Accepted answer

Leon Lu (Shanghai Wicresoft Co,.Ltd.) 76,386 Microsoft Vendor

Hello,

Xamarin support will end on May 1, 2024, it's recommended that you migrate your Xamarin app to .NET MAUI. Please see Xamarin official support policy .

=============Update==================

You used Enterprise App Navigation, please refer to the following steps to make the navigation and fix errors.

Step 1: please open MenuPageModel.cs , remove other content, just keep one constructor like following code.

public class MenuPageModel : PageModelBase
{
     public MenuPageModel() {

     

     }  
}

Step 2: Open MenuPage.xaml remove all of BindingContext= yourModel like following code.

<?xml version="1.0" encoding="utf-8" ?>
<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"
            xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
            xmlns:d="http://xamarin.com/schemas/2014/forms/design"
            xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
            xmlns:android="clr-namespace:Xamarin.Forms.PlatformConfiguration.AndroidSpecific;assembly=Xamarin.Forms.Core"
            android:TabbedPage.ToolbarPlacement="Bottom"
            mc:Ignorable="d"
            xmlns:pages="clr-namespace:MapleSugar.Pages"
            x:Class="MapleSugar.Pages.MenuPage">
    <TabbedPage.Children>
        <NavigationPage Title="Collection">
            <x:Arguments>
                <pages:CollectionPage />
            </x:Arguments>
        </NavigationPage>
        <NavigationPage Title="Tree Location">
            <x:Arguments>
                <pages:TreeInfoPage />
            </x:Arguments>
        </NavigationPage>
       <NavigationPage Title="Check List">
            <x:Arguments>
                <pages:CheckListPage />
            </x:Arguments>
        </NavigationPage>
        <NavigationPage Title="Map Page">
            <x:Arguments>
                <pages:MapPage />
            </x:Arguments>
        </NavigationPage>       
      <!--  <NavigationPage Title="File Picker">
            <x:Arguments>
                <pages:FilePickerPage BindingContext="{Binding FilePickerPage}"/>
            </x:Arguments>
        </NavigationPage>
        -->
        <NavigationPage Title="File IO">
            <x:Arguments>
                <pages:FileSystemPage />
            </x:Arguments>
        </NavigationPage>


   </TabbedPage.Children>
</TabbedPage>

Step 3: Open CheckListPage.xaml, add CheckListPageModel in the ContentPage's xml. As Note, please add pageModel for other pages like FileSystemPage , CollectionPage , TreeInfoPage CheckListPage .

<ContentPage 
...
             add this content
             xmlns:local="clr-namespace:MapleSugar.PageModels"

...
             x:Class="MapleSugar.Pages.CheckListPage">

add page model here

    <ContentPage.BindingContext>
        <local:CheckListPageModel />
    </ContentPage.BindingContext>

Step 4: open CheckListPageModel.cs, remove navigationService in constructor like following code.

public CheckListPageModel()
  {

              

      WorkTreeLocationItems = new ObservableCollection<WorkTreeLocationItem>();

      Load_Button_Clicked = new ButtonModel("Load Data", LoadCheckListAction);

       OnEditCommand = new Command(OnEditCommandAction);

      Close_App_Clicked = new ButtonModel("Close App", CloseAppAction);           

  }

And use following code to make a Navigation and send data to TreeInfoPageModel

 public async void OnEditCommandAction(object SelectedObj)
  {
      CheckListItem checkListItem = SelectedObj as CheckListItem;
      // navigationService.PushAsync(new TreeInfoPage(checkListItem));      


     var navService = PageModelLocator.Resolve<INavigationService>();



     await navService.NavigateToAsync<TreeInfoPageModel>(checkListItem, true);
      return;
  }

Step 5: In this TreeInfoPageModel.cs, please chanage the TreeInfoPageModel's constructor like following code and override InitializeAsync, you can get the navigated data by object navigationData

/*  main code */
public TreeInfoPageModel( )
{
     StatusMsg = "Ready";
     WorkTreeLocationItems = new ObservableCollection<WorkTreeLocationItem>();
     SaveLocationDataModel = new ButtonModel("Save Data", OnSaveLocationDataAction);
     Close_App_Clicked = new ButtonModel("Close App", CloseAppAction);


}


public override Task InitializeAsync(object navigationData)
{
     if (navigationData is WorkCollectedItem)
     {
         WorkCollectedItem workCollectedItem = navigationData as WorkCollectedItem;
         //  for testing.


        TreeNumber = workCollectedItem.TreeNumber.ToString();
     }


    if (navigationData is CheckListItem)
     {
         CheckListItem workCollectedItem = navigationData as CheckListItem;

         //  for testing.


        TreeNumber = workCollectedItem.TreeNumber.ToString();
     }


     return base.InitializeAsync(navigationData);
}

Best Regards,

Leon Lu

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tim 200

I've added the code you suggested, I'm not able to compile, due to the following error.

Missing default constructor for "MapleSugar.Pages.TreeInfoPage" \MapleSugar\Pages\MenuPage.xaml 19

<pages:TreeInfoPage BindingContext="{Binding TreeInfoPageModel}"/>

<?xml version="1.0" encoding="utf-8" ?>

<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"

        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

        xmlns:d="http://xamarin.com/schemas/2014/forms/design"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        xmlns:android="clr-namespace:Xamarin.Forms.PlatformConfiguration.AndroidSpecific;assembly=Xamarin.Forms.Core"

        android:TabbedPage.ToolbarPlacement="Bottom"

        mc:Ignorable="d"

        xmlns:pages="clr-namespace:MapleSugar.Pages"

        x:Class="MapleSugar.Pages.MenuPage">

<TabbedPage.Children>

    <NavigationPage Title="Collection">

        <x:Arguments>

            <pages:CollectionPage BindingContext="{Binding CollectionPageModel}"/>

        </x:Arguments>

    </NavigationPage>

     <NavigationPage Title="Tree Location">

        <x:Arguments>

            **<pages:TreeInfoPage BindingContext="{Binding TreeInfoPageModel}"/>**

        </x:Arguments>

    </NavigationPage> 

    <NavigationPage Title="Check List">

        <x:Arguments>

            <pages:CheckListPage BindingContext="{Binding CheckListPageModel}"/>

        </x:Arguments>

    </NavigationPage>

    <NavigationPage Title="Map Page">

Am I missing something here?

using MapleSugar.Models;

using Xamarin.Forms;

using Xamarin.Forms.Xaml;

namespace MapleSugar.Pages

{

[XamlCompilation(XamlCompilationOptions.Compile)]

public partial class TreeInfoPage : ContentPage

{

    public TreeInfoPage(CheckListItem checkListItem)

    {

        InitializeComponent();

    }

}

}

Tim.

Leon Lu (Shanghai Wicresoft Co,.Ltd.) 76,386 Reputation points Microsoft Vendor

2024-04-12T03:16:51.9566667+00:00
Please keep the two constructors in the TreeInfoPage like following code.

public partial class TreeInfoPage : ContentPage { public TreeInfoPage() { InitializeComponent(); } public TreeInfoPage(CheckListItem checkListItem) { InitializeComponent(); } }

By the way, do you want to implement Enterprise App Navigation?
tim 200 Reputation points

2024-04-12T13:18:29.7233333+00:00
that code got me by the constructor error but now I get, not sure what to do for this.

TinyIoC.TinyIoCResolutionException

Message=Unable to resolve type: MapleSugar.PageModels.MenuPageModel

Source=mscorlib

StackTrace:

at TinyIoC.TinyIoCContainer+MultiInstanceFactory.GetObject (System.Type requestedType, TinyIoC.TinyIoCContainer container, TinyIoC.NamedParameterOverloads parameters, TinyIoC.ResolveOptions options) [0x0001d] in D:\Users\Antec\Documents\Visual_Studio_Projects\MapleSugar\MapleSugar\MapleSugar\TinyIoC\TinyIoC.cs:2889

at TinyIoC.TinyIoCContainer.ResolveInternal (TinyIoC.TinyIoCContainer+TypeRegistration registration, TinyIoC.NamedParameterOverloads parameters, TinyIoC.ResolveOptions options) [0x0002c] in D:\Users\Antec\Documents\Visual_Studio_Projects\MapleSugar\MapleSugar\MapleSugar\TinyIoC\TinyIoC.cs:3844

at TinyIoC.TinyIoCContainer.Resolve (System.Type resolveType) [0x00001] in D:\Users\Antec\Documents\Visual_Studio_Projects\MapleSugar\MapleSugar\MapleSugar\TinyIoC\TinyIoC.cs:1854

at MapleSugar.PageModels.Base.PageModelLocator.CreatePageFor (System.Type pageModelType) [0x00019] in D:\Users\Antec\Documents\Visual_Studio_Projects\MapleSugar\MapleSugar\MapleSugar\PageModels\Base\PageModelLocator.cs:42

Tim

at MapleSugar.Services.Navigation.NavigationService.NavigateToAsync[TPageModelBase] (System.Object navigationData, System.Boolean setRoot) [0x0001d] in D:\Users\Antec\Documents\Visual_Studio_Projects\MapleSugar\MapleSugar\MapleSugar\Services\Navigation\NavigationService.cs:18

at MapleSugar.PageModels.SplashPageModel.OnSplashPageAction (System.Object ogj) [0x00027] in D:\Users\Antec\Documents\Visual_Studio_Projects\MapleSugar\MapleSugar\MapleSugar\PageModels\SplashPageModel.cs:27

at System.Runtime.CompilerServices.AsyncMethodBuilderCore+<>c.<ThrowAsync>b__7_0 (System.Object state) [0x00000] in /Users/builder/jenkins/workspace/archive-mono/2020-02/android/release/mcs/class/referencesource/mscorlib/system/runtime/compilerservices/AsyncMethodBuilder.cs:1021

at Android.App.SyncContext+<>c__DisplayClass2_0.<Post>b__0 () [0x00000] in /Users/builder/azdo/_work/1/s/xamarin-android/src/Mono.Android/Android.App/SyncContext.cs:36

at Java.Lang.Thread+RunnableImplementor.Run () [0x00008] in /Users/builder/azdo/_work/1/s/xamarin-android/src/Mono.Android/Java.Lang/Thread.cs:36

at Java.Lang.IRunnableInvoker.n_Run (System.IntPtr jnienv, System.IntPtr native__this) [0x00008] in /Users/builder/azdo/_work/1/s/xamarin-android/src/Mono.Android/obj/Release/monoandroid10/android-29/mcw/Java.Lang.IRunnable.cs:84

at (wrapper dynamic-method) Android.Runtime.DynamicMethodNameCounter.25(intptr,intptr)

Line 3844 is the throw code

private object ResolveInternal(TypeRegistration registration, NamedParameterOverloads parameters, ResolveOptions options)

{ ObjectFactoryBase factory; // Attempt container resolution if (_RegisteredTypes.TryGetValue(registration, out factory)) { try { return factory.GetObject(registration.Type, this, parameters, options); } catch (TinyIoCResolutionException) { **throw;** } catch (Exception ex) { throw new TinyIoCResolutionException(registration.Type, ex); } }

tim 200

It appears that the error is caused by (INavigation navigationService) in the following

public CheckListPageModel(INavigation navigationService)

if I change it to

public CheckListPageModel()

the error does not occur but I'll get the following error

Object reference not set to an instance of an object.'

when navigationService.PushAsync(new TreeInfoPage(checkListItem));

returns from executing

public TreeInfoPage(CheckListItem checkListItem)

{

    InitializeComponent();

}

    **{**

        **InitializeComponent();**

    **}**
```**CheckListPageModel code ( the major parts)**

namespace MapleSugar.PageModels

{

```powershell
public class CheckListPageModel : PageModelBase

{

    public ICommand OnEditCommand { get; set; }

    public List<WorkCheckListItem> WorkCheckListItems { get; set; }

    ObservableCollection<WorkTreeLocationItem> _workTreeLocationItem;

    public ObservableCollection<WorkTreeLocationItem> WorkTreeLocationItems

    {

        get => _workTreeLocationItem;

        set => SetProperty(ref _workTreeLocationItem, value);

    }
``` public ObservableCollection<Grouping<string, CheckListItem>> MyItems { get; set; } = new ObservableCollection<Grouping<string, CheckListItem>>();

```typescript
    INavigation navigationService;

    public CheckListPageModel(INavigation navigationService)

    {

       this.navigationService = navigationService;

        WorkTreeLocationItems = new ObservableCollection<WorkTreeLocationItem>();

        Load_Button_Clicked = new ButtonModel("Load Data", LoadCheckListAction);

        OnEditCommand = new Command(OnEditCommandAction);

        Close_App_Clicked = new ButtonModel("Close App", CloseAppAction);           

    }
```Object reference not set to an instance of an object.'

```vba
   public void OnEditCommandAction(object SelectedObj)

    {

        CheckListItem checkListItem = SelectedObj as CheckListItem;

        navigationService.PushAsync(new TreeInfoPage(checkListItem));      

        return;

    }
```Tim

Leon Lu (Shanghai Wicresoft Co,.Ltd.) 76,386 Reputation points Microsoft Vendor

2024-04-15T07:39:37.55+00:00

I cannot reproduce this issue in my side. Could you share a mini demo with us in private message, I sent a private message to you, please check it.

tim 200

splash page

<?xml version="1.0" encoding="utf-8" ?>

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"

        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

        xmlns:d="http://xamarin.com/schemas/2014/forms/design"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        mc:Ignorable="d" 

         Title="Tree Location and Collection App"

         x:Class="MapleSugar.Pages.SplashPage">

<ContentPage.Content>

    <StackLayout>

        <Label Text=" "

            HorizontalOptions="CenterAndExpand" />

        <Button Text=" Menu Page" Command="{Binding SplashScreenCommand}" /> 

    </StackLayout>

</ContentPage.Content>

</ContentPage>

using Xamarin.Forms;

using Xamarin.Forms.Xaml;

namespace MapleSugar.Pages

{

[XamlCompilation(XamlCompilationOptions.Compile)]

public partial class SplashPage : ContentPage

{

    public SplashPage()

    {

        InitializeComponent();

    }

 

}

}

using MapleSugar.PageModels.Base;

using MapleSugar.Services.Navigation;

using System.Windows.Input;

using Xamarin.Forms;

namespace MapleSugar.PageModels

{

public class SplashPageModel : PageModelBase

{

    private ICommand _splashScreenCommand;

    public ICommand SplashScreenCommand

    {

        get => _splashScreenCommand;

        set => SetProperty(ref _splashScreenCommand, value);

    }

    private INavigationService _navigationService;

    public SplashPageModel(INavigationService navigationService)

    {

        _navigationService = navigationService;

        SplashScreenCommand = new Command(OnSplashPageAction);

    }

    private async void OnSplashPageAction(object ogj)

    {

        await _navigationService.NavigateToAsync<MenuPageModel>();            

    }

}

}

Menu page

<?xml version="1.0" encoding="utf-8" ?>

<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"

        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

        xmlns:d="http://xamarin.com/schemas/2014/forms/design"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        xmlns:android="clr-namespace:Xamarin.Forms.PlatformConfiguration.AndroidSpecific;assembly=Xamarin.Forms.Core"

        android:TabbedPage.ToolbarPlacement="Bottom"

        mc:Ignorable="d"

        xmlns:pages="clr-namespace:MapleSugar.Pages"

        x:Class="MapleSugar.Pages.MenuPage">

<TabbedPage.Children>

    <NavigationPage Title="Collection">

        <x:Arguments>

            <pages:CollectionPage BindingContext="{Binding CollectionPageModel}"/>

        </x:Arguments>

    </NavigationPage>

    <NavigationPage Title="Tree Location">

        <x:Arguments>

            <pages:TreeInfoPage BindingContext="{Binding TreeInfoPageModel}"/>

        </x:Arguments>

    </NavigationPage>

   <NavigationPage Title="Check List">

        <x:Arguments>

            <pages:CheckListPage BindingContext="{Binding CheckListPageModel}"/>

        </x:Arguments>

    </NavigationPage>

    <NavigationPage Title="Map Page">

        <x:Arguments>

            <pages:MapPage BindingContext="{Binding MapePage}"/>

        </x:Arguments>

    </NavigationPage>

    <NavigationPage Title="File IO">

        <x:Arguments>

            <pages:FileSystemPage BindingContext="{Binding FileSystemPage}"/>

        </x:Arguments>

    </NavigationPage>

</TabbedPage.Children>

</TabbedPage>

using Xamarin.Forms;

using Xamarin.Forms.Xaml;

namespace MapleSugar.Pages

{

[XamlCompilation(XamlCompilationOptions.Compile)]

public partial class MenuPage : TabbedPage

{

    public MenuPage()

    {

        InitializeComponent();

    }

}

}

using MapleSugar.PageModels.Base;

using System.Threading.Tasks;

namespace MapleSugar.PageModels

{

public class MenuPageModel : PageModelBase

{ 

    /// <summary>

    /// 

    /// </summary>

    private CheckListPageModel _checklistPM;

    public CheckListPageModel CheckListPageModel

    {

        get => _checklistPM;

        set => SetProperty(ref _checklistPM, value);

    }

    /// <summary>

    /// 

    /// </summary>

    private CollectionPageModel _collectionPM;

    public CollectionPageModel CollectionPageModel

    {

        get => _collectionPM;

        set => SetProperty(ref _collectionPM, value);

    }

            

    /// <summary>

    /// 

    /// </summary>

    private TreeInfoPageModel _treeinfoPM;

    public TreeInfoPageModel TreeInfoPageModel

    {

        get => _treeinfoPM;

        set => SetProperty(ref _treeinfoPM, value);

    }

    /// <summary>

    /// 

    /// </summary>

    /// <param name="checklistPM"></param>

    /// <param name="collectionPM"></param>

    /// <param name="treeinfoPM"></param>

    public MenuPageModel(

        

        CollectionPageModel collectionPM,           

        TreeInfoPageModel treeinfoPM,

        CheckListPageModel checklistPM)

    {

        CollectionPageModel = collectionPM;

        TreeInfoPageModel = treeinfoPM;

        CheckListPageModel = checklistPM;

    }

    public override Task InitializeAsync(object navigationData)

    {

        return Task.WhenAny(base.InitializeAsync(navigationData),

            

            TreeInfoPageModel.InitializeAsync(null),

            CollectionPageModel.InitializeAsync(null),

            CheckListPageModel.InitializeAsync(null));

    }

}

}

tim 200 Reputation points

2024-04-16T13:08:13.3266667+00:00

Thanks for looking at this issue

tim 200

xaml code

splash page

<?xml version="1.0" encoding="utf-8" ?>

<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"

        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

        xmlns:d="http://xamarin.com/schemas/2014/forms/design"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        mc:Ignorable="d" 

         Title="Tree Location and Collection App"

         x:Class="MapleSugar.Pages.SplashPage">

<ContentPage.Content>

    <StackLayout>

        <Label Text=" "

            HorizontalOptions="CenterAndExpand" />

        <Button Text=" Menu Page" Command="{Binding SplashScreenCommand}" /> 

    </StackLayout>

</ContentPage.Content>

</ContentPage>

menu page

<?xml version="1.0" encoding="utf-8" ?>

<TabbedPage xmlns="http://xamarin.com/schemas/2014/forms"

        xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"

        xmlns:d="http://xamarin.com/schemas/2014/forms/design"

        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"

        xmlns:android="clr-namespace:Xamarin.Forms.PlatformConfiguration.AndroidSpecific;assembly=Xamarin.Forms.Core"

        android:TabbedPage.ToolbarPlacement="Bottom"

        mc:Ignorable="d"

        xmlns:pages="clr-namespace:MapleSugar.Pages"

        x:Class="MapleSugar.Pages.MenuPage">

<TabbedPage.Children>

    <NavigationPage Title="Collection">

        <x:Arguments>

            <pages:CollectionPage BindingContext="{Binding CollectionPageModel}"/>

        </x:Arguments>

    </NavigationPage>

    <NavigationPage Title="Tree Location">

        <x:Arguments>

            <pages:TreeInfoPage BindingContext="{Binding TreeInfoPageModel}"/>

        </x:Arguments>

    </NavigationPage>

   <NavigationPage Title="Check List">

        <x:Arguments>

            <pages:CheckListPage BindingContext="{Binding CheckListPageModel}"/>

        </x:Arguments>

    </NavigationPage>

    <NavigationPage Title="Map Page">

        <x:Arguments>

            <pages:MapPage BindingContext="{Binding MapePage}"/>

        </x:Arguments>

    </NavigationPage>

    <NavigationPage Title="File IO">

        <x:Arguments>

            <pages:FileSystemPage BindingContext="{Binding FileSystemPage}"/>

        </x:Arguments>

    </NavigationPage>

</TabbedPage.Children>

</TabbedPage>

tim 200 Reputation points

2024-04-18T22:35:48.6133333+00:00

Leon,

I'm not sure what is happening to the private messages , I can not see any of the text in them. so I don't know what you wrote from the 16th on.

Tim
Leon Lu (Shanghai Wicresoft Co,.Ltd.) 76,386 Reputation points Microsoft Vendor

2024-04-19T00:40:40.87+00:00

Please see my updated answer. I move this part to answer.
tim 200 Reputation points

2024-04-19T21:35:43.31+00:00

Leon,

Thanks for Helping me with this Issue, I really appreciate your taking the time to look into my project.

Again Thanks.

Tim
Leon Lu (Shanghai Wicresoft Co,.Ltd.) 76,386 Reputation points Microsoft Vendor

2024-04-22T00:47:00.55+00:00

tim You are welcome. Happy coding!

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Muhammad Nomann 0 Reputation points

2024-04-17T08:02:13.5166667+00:00

I was having the same issue but you described it pretty well. Thanks alot!
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tim 200 Reputation points

2024-04-18T12:26:06.87+00:00

Leon,

I'm not sure what is happening to the private messages , I can not see any of the text in them. so I don't know what you wrote from the 16th on.

Tim
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Xamarin navigate to page throws "Object reference not set to an instance of an object."

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