Helper method for Windows.UI.Xaml.Media.Imaging.SvgImageSource

SvgImageHelper.cs

using System;
using System.Diagnostics;
using System.IO;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Xml.Linq;
using Windows.Storage;
using Windows.Storage.Streams;
using Windows.UI.Xaml.Media.Imaging;

public static class SvgImageHelper
{
    public static async Task<SvgImageSource> GetImageAsync(StorageFile file)
    {
        using IRandomAccessStream fs = await file.OpenAsync(FileAccessMode.Read);
        using StreamReader sr = new StreamReader(fs.AsStreamForRead(), Encoding.UTF8);

        string svgString = await sr.ReadToEndAsync();
        XDocument doc = XDocument.Parse(svgString);
        double originalWidth = GetValue(doc.Root.Attribute("width")?.Value);
        double originalHeight = GetValue(doc.Root.Attribute("height")?.Value);

        if (originalWidth == 0 || originalHeight == 0)
            return null;

        fs.Seek(0);

        Debug.WriteLine($"width:{originalWidth}, height:{originalHeight}");

        SvgImageSource svgImage = new SvgImageSource
        {
            RasterizePixelWidth = originalWidth,
            RasterizePixelHeight = originalHeight,
        };
        await svgImage.SetSourceAsync(fs);

        return svgImage;

        static double GetValue(in string source)
        {
            if (!string.IsNullOrEmpty(source))
            {
                Regex pattern = new Regex(@"(?<value>(\d|\.)+)");
                Match match = pattern.Match(source);
                if (match.Success && double.TryParse(match.Groups["value"].Value, out double value))
                    return value;
            }
            return 0;
        }
    }
}