Question

我正在尝试从谷歌驱动器下载文件，这是我的代码

private static IAuthenticator CreateAuthenticator()
{
    var provider = new NativeApplicationClient(GoogleAuthenticationServer.Description);
    provider.ClientIdentifier = ClientCredentials.CLIENT_ID;
    provider.ClientSecret = ClientCredentials.CLIENT_SECRET;
    return new OAuth2Authenticator<NativeApplicationClient>(provider, GetAuthorization);
}


public static System.IO.Stream DownloadFile(
        IAuthenticator authenticator, Google.Apis.Drive.v2.Data.File file)
    {

        if (!String.IsNullOrEmpty(file.DownloadUrl))
        {
            try
            {
                HttpWebRequest request = (HttpWebRequest)WebRequest.Create(
                    new Uri(file.DownloadUrl));
                authenticator.ApplyAuthenticationToRequest(request);
                HttpWebResponse response = (HttpWebResponse)request.GetResponse();
                if (response.StatusCode == HttpStatusCode.OK)
                {

                    return response.GetResponseStream();
                }
                else
                {
                    Console.WriteLine(
                        "An error occurred: " + response.StatusDescription);
                    return null;
                }
            }
            catch (Exception e)
            {
                Console.WriteLine("An error occurred: " + e.Message);
                return null;
            }
        }
        else
        {
            // The file doesn't have any content stored on Drive.
            return null;
        }
    }

在.aspx页面代码中 { System.IO.Stream stream = Utilities.DownloadFile（CreateAuthenticator（），FIle）;

            //Convert the stream to an array of bytes.
            System.IO.BinaryReader br = new System.IO.BinaryReader(stream);
            Byte[] byteArray = br.ReadBytes((int)stream.Length);

显示此流不支持搜索操作。

哪里是错误谢谢你....

Answer 1

如果您只是想下载文件，则无需搜索该文件。你应该做的只是阅读流，即通过DownloadFile API方法，并将其传递给浏览器。我已通过以下代码启用它：

public FileResult DownloadFile(string fileId)
    {
        DriveService service = Session["service"] as DriveService;
        Google.Apis.Drive.v2.Data.File file = service.Files.Get(fileId).Fetch(); 
        System.IO.Stream data = new GDriveRepository(Utils.ReturnIAuth((GoogleAuthenticator)Session["Gauthenticator"])).DownloadFile(file.DownloadUrl);

        return File(data, System.Net.Mime.MediaTypeNames.Application.Octet, file.Title);
    }

如何从Google Drive asp.net下载文件

1 个答案: