I am trying to convert a Telerik map to Image.

Telerik has an ExportToImage method that works for a map created in View.

But in this case I create a map dynamically and not in View.

When I use PrintVisual I see the map perfectly,

But when I use all kinds of methods that convert FrameworkElement to Image,

including Telerik's ExportToImage, I only get a picture of the Layers inside the map.

private void LocationsToImage(ICollection<LocationType> locationCollection, Size size)
{
    var map = new RadMap
    {
        Language = XmlLanguage.GetLanguage(CultureInfo.DefaultThreadCurrentCulture.Name),
        Width = size.Width,
        Height = size.Height
    };
    var layer = new InformationLayer();
    map.Items.Add(layer);
    MapHelper.DrawLocations(map, layer, locationCollection);

    //print 
    map.Arrange(new Rect(size));
    map.Measure(size);
    map.Provider = MapProviderFactory.Create();

    var path = @"C:\Test.png";

    SaveToPng(map, path);
}

void SaveToPng(FrameworkElement visual, string fileName)
{
    var encoder = new PngBitmapEncoder();
    SaveUsingEncoder(visual, fileName, encoder);
}

void SaveUsingEncoder(FrameworkElement visual, string fileName, BitmapEncoder encoder)
{
    RenderTargetBitmap bitmap = new RenderTargetBitmap((int)visual.ActualWidth, (int)visual.ActualHeight, 96, 96, PixelFormats.Pbgra32);
    bitmap.Render(visual);
    BitmapFrame frame = BitmapFrame.Create(bitmap);
    encoder.Frames.Add(frame);

    using (var stream = File.Create(fileName))
    {
        encoder.Save(stream);
    }
}

And the result I get:

enter image description here

Instead of a normal map, like this:

enter image description here

Would appreciate help

CodePudding user response：

You probably have to wait for the map to load, try doing this:

map.Provider = MapProviderFactory.Create();
await Task.Run(async () => await Task.Delay(TimeSpan.FromSeconds(1)));

And then save to image