Question

我在下载过程中遇到问题，它会下载，但下载的文件大小相同：108102字节;无论实际文件是小于还是大于此。

我能够成功上传PDF文件并设置其权限，以便链接https://drive.google.com/open?id=UNIQUE_ID_HERE的任何人都可以查看该文件。下面是我用来异步下载文件的函数：

    /// <summary>Downloads the media from the given URL.</summary>
    private async Task DownloadFile(DriveService service, string url)
    {
        var downloader = new MediaDownloader(service);
        downloader.ChunkSize = DownloadChunkSize;
        // add a delegate for the progress changed event for writing to console on changes
        downloader.ProgressChanged += Download_ProgressChanged;

        var fileName = DownloadDirectoryName + @"\cover_new.pdf";

        Console.WriteLine("Downloading file from link: {0}", url);

        using (var fileStream = new System.IO.FileStream(fileName, System.IO.FileMode.Create, System.IO.FileAccess.Write))
        {
            var progress = await downloader.DownloadAsync(url, fileStream);

            if (progress.Status == DownloadStatus.Completed)
            {
                Console.WriteLine(fileName + " was downloaded successfully: " + progress.BytesDownloaded);
            }
            else
            {
                Console.WriteLine("Download {0} was interrupted in the middle. Only {1} were downloaded. ", fileName, progress.BytesDownloaded);
            }
        }
    }

此外，我可以使用链接从其他浏览器成功打开此文件，而无需输入任何凭据。

Answer 1

我错误地尝试使用以下网址下载文件：https://drive.google.com/open?id=UNIQUE_ID_HERE。

我对方法所做的更改：

第二个参数url现在是file个对象。我正在传递网址，但我应该使用service.Files.Get()并使用其ID来获取文件。
为清晰起见，将第二个参数重命名为fileToDownload。
由于我现在有一个文件对象downloadfile用于我想要下载的文件，我可以调用它的DownloadAsync方法，向它发送我已经拥有的文件流。

以下新代码：

    private async Task DownloadFile(DriveService service, Google.Apis.Drive.v3.Data.File fileToDownload)
    {

        var downloader = new MediaDownloader(service);
        downloader.ChunkSize = DownloadChunkSize;
        // add a delegate for the progress changed event for writing to console on changes
        downloader.ProgressChanged += Download_ProgressChanged;

        var fileName = DownloadDirectoryName + @"\cover_new.pdf";

        var downloadfile = service.Files.Get(fileToDownload.Id);

        Console.WriteLine("Downloading file with id: {0}", fileToDownload);

        using (var fileStream = new System.IO.FileStream(fileName, System.IO.FileMode.Create, System.IO.FileAccess.Write))
        {
            var progress = await downloadfile.DownloadAsync(fileStream);

            if (progress.Status == DownloadStatus.Completed)
            {
                Console.WriteLine(fileName + " was downloaded successfully: " + progress.BytesDownloaded);
            }
            else
            {
                Console.WriteLine("Download {0} was interrupted in the middle. Only {1} were downloaded. ", fileName, progress.BytesDownloaded);
            }
        }
    }

我希望这可以帮助那些人。

从Google云端硬盘下载文件损坏

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