How To Convert System.Drawing.Bitmap to Microsoft.UI.Xaml.Media.Imaging.BitmapImage

// get bitmapimage
var bitmapImage = await ConvertBitmapToBitmapImage(app.AppIcon);


// determine bitmapimage not null
if (bitmapImage != null) {
    // set app icon
    appItem.AppIcon = bitmapImage;
}

Add the Function 'ConvertBitmapToBitmapImage':

// convert bitmap to bitmapimage
public static async TaskBitmapImage> ConvertBitmapToBitmapImage(System.Drawing.Bitmap bitmap) {
    // determine bitmap not null
    if (bitmap == null)
        // return null
        return null;

    // create new bitmapimage
    Microsoft.UI.Xaml.Media.Imaging.BitmapImage bitmapImage = new();

    // create imagestream
    var imageStream = new MemoryStream();

    // using imagestream
    using (imageStream) {
        // save bitmap as jpeg
        bitmap.Save(imageStream, ImageFormat.Jpeg);
        imageStream.Position = 0;

        // convert stream to bytes array
        byte[] imageBytes = imageStream.ToArray();
                
        // get bitmapimage from bytes
        bitmapImage = await GetBitmapImageFromBitmapBytes(imageBytes);
    }

    // return bitmapimage
    return bitmapImage;
}

Add the Function 'GetBitmapImageFromBitmapBytes':

// get bitmapimage from bitmap bytes
public static async TaskBitmapImage> GetBitmapImageFromBitmapBytes(byte[] data) {
    // create new bitmapimage
    Microsoft.UI.Xaml.Media.Imaging.BitmapImage bitmapImage = new();

    // using memorystream
    using (var stream = new InMemoryRandomAccessStream()) {
        // using datawriter
        using (var writer = new DataWriter(stream)) {
            // write bytes
            writer.WriteBytes(data);
                    
            // store
            await writer.StoreAsync();

            // flush
            await writer.FlushAsync();

            // detach
            writer.DetachStream();
        }

        // set stream to 0
        stream.Seek(0);

        // set bitmapimage source from stream
        await bitmapImage.SetSourceAsync(stream);
    }

    // return bitmapimage
    return bitmapImage;
}

Tags: WinUI, C#, XAML, Visual Studio, Microsoft, Windows