After searching far and wide, and getting nowhere, I decided to ask.

I have a .NET 5.0 WPF project I am working on, and I have to bind an URL (of an online image) to the source of an image on my form.

I have tried the following:

CoverImage.Source = new BitmapImage("https://somesite..com/img.png");

as well as binding it via XAML:

///XAML:
<Image Name="CoverImage"
       Source="{Binding PreviewSource}"/>

///C#
public string PreviewSource { get; set; } = "https://somesite..com/img.png";

I have tried other solutions such as getting the image from a HrrpRequest and then creating it through a MemoryStream.

Using local images (that are on the pc) works without issues.

CodePudding user response：

new BitmapImage(new Uri("https://www.google.se/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png"))` 

and

<Image Name="CoverImage" Source="https://www.google.se/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png"/>

...works just as expected on .NET 5.

Make sure that your URL is valid and reachable from your client machine.

CodePudding user response：

Are you sure the datacontext is correct? It works for me in the app below.

Xaml Code

<Grid>
    <Image Name="CoverImage" Source="{Binding ImageSource}"/>
</Grid>

ViewModel

class MainWindowViewModel : ViewModelBase
{
    private BitmapImage _imageSource;

    public BitmapImage ImageSource
    {
        get => _imageSource;
        set => SetProperty(ref _imageSource, value);
    }

    public MainWindowViewModel()
    {
        ImageSource = new BitmapImage(new Uri("https://www.google.se/images/branding/googlelogo/2x/googlelogo_color_92x30dp.png"));
    }
}

ViewModelBase

public abstract class ViewModelBase : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    protected virtual bool SetProperty<T>(ref T member, T value, [CallerMemberName] string propertyName = null)
    {
        if (EqualityComparer<T>.Default.Equals(member, value))
        {
            return false;
        }

        member = value;
        OnPropertyChanged(propertyName);
        return true;
    }

    protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
        => PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
}

MainWindow.xaml.cs

public MainWindow()
    {
        DataContext = new MainWindowViewModel();
        InitializeComponent();
      
    }