using OpenSlideNET;

Console.WriteLine(OpenSlideImage.LibraryVersion);

string format = OpenSlideImage.DetectFormat(fileName);
Console.WriteLine(
        format == null ? 
        "File format not supported.":
        $"File format ({format}) supported.");

using (OpenSlideImage image = OpenSlideImage.Open(fileName))
{
    Console.WriteLine($"Width: {image.Width} Height: {image.Height}");
    Console.WriteLine($"Level count: {image.LevelCount}");
}

using (OpenSlideImage image = OpenSlideImage.Open(fileName))
{
    var dz = new DeepZoomGenerator(image, tileSize: 254, overlap: 1);
    // Generate dzi file.
    string dziFileContent = dz.GetDzi(format: "jpeg");
    // Get raw tile data.
    DeepZoomGenerator.TileInfo tileInfo;
    byte[] rawTileData = dz.GetTile(level: 0, locationX: 0, locationY: 0, out tileInfo);
    // rawTileData contains BGRA data for every pixel. rawTileData.Length == 4 * tileInfo.Width * tileInfo.Height
    if (tileInfo.ResizeNeeded)
    {
        // Code here to resize image from (tileInfo.Width, tileInfo.Height) to (tileInfo.TileWidth, tileInfo.TileHeight)
    }
    // Alternatively, use GetTileAsJpeg to directly get JPEG encoded data.
    byte[] someTile = dz.GetTileAsJpeg(level: 0, locationX: 0, locationY: 0, out tileInfo);
    // if you are using GetTileAsJpeg and friends, you do NOT need to manually resize image to (tileInfo.TileWidth, tileInfo.TileHeight) as GetTileAsJpeg does this for you.
}