用Xamarin下载文件的正确方式？

public async Task DownloadFile(string url, string filePath)
{
    using (HttpClient client = new HttpClient())
    {
        using (HttpResponseMessage response = await client.GetAsync(url))
        {
            using (Stream stream = await response.Content.ReadAsStreamAsync())
            {
                using (FileStream fileStream = new FileStream(filePath, FileMode.Create))
                {
                    await stream.CopyToAsync(fileStream);
                }
            }
        }
    }
}

string url = "https://example.com/file.pdf";
string filePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal), "file.pdf");
await DownloadFile(url, filePath);