Media Plugin not displaying an image after capture MVVM - xamarin.forms

Question

I am using Media Plugin and everything worked fine until i have decided to move my logic to ViewModel.
This is my Xaml
<Frame BackgroundColor="LightGray" HasShadow="True">
<Image
x:Name="Photo"
Grid.Row="2"
HeightRequest="100"
Source="{Binding postViewModel.SelectedPhoto}"
VerticalOptions="Start"/>
</Frame>
My Binding to MasterViewModel
MasterPostsViewModel ViewModel;
protected override void OnAppearing()
{
base.OnAppearing();
BindingContext = ViewModel = new MasterPostsViewModel(Navigation);
}
My Master
class MasterPostsViewModel : BaseViewModel
{
public PostViewModel postViewModel { get; set; }
public CategoriesViewModel categoriesViewModel { get; set; }
public MasterPostsViewModel(INavigation navigation)
{
postViewModel = new PostViewModel();
categoriesViewModel = new CategoriesViewModel();
postViewModel = new PostViewModel(navigation);
}
}
Taking Picture in View Model
private MediaFile _selectedPhoto;
public MediaFile SelectedPhoto { get => _selectedPhoto; set => SetValue(ref
_selectedPhoto, value); }
private async Task TakePicture()
{
await Permission();
var imageSource = await DependencyService.Get<IMessage>().ShowActionSheet(AppResources.AlertPhoto, AppResources.AlertNewPhoto, AppResources.AlertGallery);
if (imageSource == AppResources.AlertNewPhoto)
{
var imageFileName = await CrossMedia.Current.TakePhotoAsync(new StoreCameraMediaOptions()
{
Name = $"{DateTime.UtcNow}.jpg",
DefaultCamera = Plugin.Media.Abstractions.CameraDevice.Rear,
PhotoSize = PhotoSize.Medium,
SaveToAlbum = true
});
if (imageFileName == null) return;
else
{
SelectedPhoto = imageFileName;
}
}
}
I can see tthe adress of the picture however the picture doesnt display on my xaml. I have tried to follow this
Bind Plugin.Media fromViewModel
But still didnt work. Please some suggestion on what am i doing wrong

Answer 1

I use you code and write a demo with binding a string, it works well. You can have a look at the code and may get some idea from it.
Code in xaml:
<StackLayout>
<!-- Place new controls here -->
<Label Text="{Binding postViewModel.SelectedPhoto}"
HorizontalOptions="Center"
VerticalOptions="CenterAndExpand" />
<Button Text="click me" Command ="{Binding postViewModel.NewCommand}"/>
</StackLayout>
Code behind:
public partial class MainPage : ContentPage
{
public MainPage()
{
InitializeComponent();
}
MasterPostsViewModel ViewModel;
protected override void OnAppearing()
{
base.OnAppearing();
BindingContext = ViewModel = new MasterPostsViewModel(Navigation);
}
}
class MasterPostsViewModel
{
public PostViewModel postViewModel { get; set; }
public MasterPostsViewModel(INavigation navigation)
{
postViewModel = new PostViewModel();
}
}
class PostViewModel : INotifyPropertyChanged
{
string _selectedPhoto;
public ICommand NewCommand { private set; get; }
public event PropertyChangedEventHandler PropertyChanged;
public PostViewModel()
{
SelectedPhoto = "default text";
NewCommand = new Command(TakePicture);
}
private void TakePicture()
{
SelectedPhoto = "test text After click button";
}
public string SelectedPhoto
{
set
{
if (_selectedPhoto != value)
{
_selectedPhoto = value;
if (PropertyChanged != null)
{
PropertyChanged(this, new PropertyChangedEventArgs("SelectedPhoto"));
}
}
}
get
{
return _selectedPhoto;
}
}
}
Sample project has been uploaded here.