使用带有进度跟踪的 Dropbox .NET 库下载文件

这使用 Dropbox .NET SDK 将文件从远程 path 的 Dropbox API 下载到本地文件 Test，同时跟踪进度：

var response = await client.Files.DownloadAsync(path);
ulong fileSize = response.Response.Size;
const int bufferSize = 1024 * 1024;

var buffer = new byte[bufferSize];

using (var stream = await response.GetContentAsStreamAsync())
{
    using (var file = new FileStream("Test", FileMode.OpenOrCreate))
    {
        var length = stream.Read(buffer, 0, bufferSize);

        while (length > 0)
        {
            file.Write(buffer, 0, length);
            var percentage = 100 * (ulong)file.Length / fileSize;
            // Update progress bar with the percentage.
            // progressBar.Value = (int)percentage
            Console.WriteLine(percentage);

            length = stream.Read(buffer, 0, bufferSize);
        }
    }
}