var downloadOpt = new DownloadConfiguration()

{

    ChunkCount = 8,

     ParallelDownload = true

};

var downloader = new DownloadService(downloadOpt);

// 開始下載時間

downloader.DownloadStarted += OnDownloadStarted;
//分塊下載進(jìn)度變化

downloader.ChunkDownloadProgressChanged += OnChunkDownloadProgressChanged;
//下載進(jìn)度變化

downloader.DownloadProgressChanged += OnDownloadProgressChanged;
//下載完成

downloader.DownloadFileCompleted += OnDownloadFileCompleted;

string file = @"d:\fileName.zip";

string url = @"https://xxx.com/fileName.zip";

await downloader.DownloadFileTaskAsync(url, file);