使用.NET SDK检索的文件谷歌驱动器列表 [英] Retrieve list of files google drive using .net sdk

问题描述

我试图来从谷歌驱动的文件列表，我使用他们提供的，因为它的例子是：

 公共静态列表＆LT;文件＆gt; RetrieveAllFiles（DriveService服务）
    {
        名单＆LT;文件＆gt;结果=新名单，其中，文件＆gt;（）;
        FilesResource.ListRequest请求= service.Files.List（）;

        做
        {
            尝试
            {
                文件列表文件= request.Fetch（）;

                result.AddRange（files.Items）;
                request.PageToken = files.NextPageToken;
            }
            赶上（例外五）
            {
                Console.WriteLine（发生错误：+ e.Message）;
                request.PageToken = NULL;
            }
        }而（String.IsNullOrEmpty（request.PageToken）！）;
        返回结果;
    }
 

它总是返回文件计数= 0 而我pretty的确认登录的帐户有许多文件！是否有其他需要的东西吗？

编辑： 对于身份验证：

 公共静态IAuthenticator GetCredentials（字符串授权code，字符串州）
    {
        字符串EMAILADDRESS =;
        尝试
        {
            IAuthorizationState凭证=兑换code（授权code）;
            用户信息用户信息= GetUserInfo（凭证）;
            字符串userid = userInfo.Id;
            EMAILADDRESS = userInfo.Email;
            如果（！String.IsNullOrEmpty（credentials.RefreshToken））
            {
                StoreCredentials（用户标识，证书）;
                返回GetAuthenticatorFromState（凭证）;
            }
            其他
            {
                凭据= GetStoredCredentials（用户ID）;
                如果（凭证= NULL和放大器;！＆安培;！String.IsNullOrEmpty（credentials.RefreshToken））
                {
                    返回GetAuthenticatorFromState（凭证）;
                }
            }
        }
        赶上（codeExchangeException E）
        {
            Console.WriteLine（在code交换时发生错误。）;
            //硬盘应用应尽量以检索用户和凭据当前
            //会话。
            //如果没有可用的，将用户重定向到授权的URL。
            e.AuthorizationUrl = GetAuthorizationUrl（EMAILADDRESS，状态）;
            扔ê;
        }
        赶上（NoUserIdException）
        {
            Console.WriteLine（无用户ID可以检索。）;
        }
        //没有刷新令牌已被检索。
        字符串authorizationUrl = GetAuthorizationUrl（EMAILADDRESS，状态）;
        抛出新NoRefreshTokenException（authorizationUrl）;
    }

     内部静态Google.Apis.Drive.v2.DriveService编译服务（IAuthenticator凭证）
    {
        返回新Google.Apis.Drive.v2.DriveService（凭证）;
    }
 

在控制器

 公众的ActionResult指数（字符串状态，串code）
    {
        尝试
        {
            名单＆LT;文件＆gt;文件=新的名单，其中，文件＆gt;（）;
            IAuthenticator身份验证= Utils.GetCredentials（code，状态）;
            //存储认证和会话的授权服务
            会话[身份验证] =身份验证;
            DriveService服务= Utils.BuildService（验证）;

            如果（验证= NULL和放大器;！＆安培;服务！= NULL）
            {
                文件= GoogleDriveHelper.RetrieveAllFiles（服务）;
                返回查看（文件）;
            }
        }
        赶上（codeExchangeException）
        {
            如果（会话[服务] == NULL ||会话[身份验证] == NULL）
            {
                的Response.Redirect（Utils.GetAuthorizationUrl（，状态））;
            }
        }
        赶上（NoRefreshTokenException E）
        {
            的Response.Redirect（e.AuthorizationUrl）;
        }
     返回查看（）;
   }
 

解决方案

您必须使用该文件夹id来获取文件。我用它来获取文件夹中的文件：

 字符串folderid = FindFolder（服务，rootFolder，CreatedFolder.Title）;
名单＆LT; ChildReference＆GT; listadoFiles = service.Children.List（folderid）.Fetch（）Items.ToList（）。

公共静态字符串FindFolder（DriveService服务，字符串parentfolderId，字符串文件夹名称）
{
    ChildrenResource.ListRequest请求= service.Children.List（parentfolderId）;
    request.Q =MIMETYPE ='应用程序/ vnd.google-apps.folder'和标题='+文件夹名+';
    做
    {
        尝试
        {
            的childList儿童= request.Fetch（）;

            如果（孩子= NULL和放大器;！＆安培; children.Items.Count大于0）
            {

                返回children.Items [0] .ID;
            }

            的foreach（ChildReference孩子在children.Items）
            {
                Console.WriteLine（文件ID：+ child.Id）;
            }
            request.PageToken = children.NextPageToken;
        }
        赶上（例外五）
        {
            Console.WriteLine（发生错误：+ e.Message）;
            request.PageToken = NULL;
        }
    }而（String.IsNullOrEmpty（request.PageToken）！）;

    返回的String.Empty;
}
 

I'm trying to fetch list of files from Google drive, I'm using the example they provide as it is:

public static List<File> RetrieveAllFiles(DriveService service)
    {
        List<File> result = new List<File>();
        FilesResource.ListRequest request = service.Files.List();

        do
        {
            try
            {
                FileList files = request.Fetch();

                result.AddRange(files.Items);
                request.PageToken = files.NextPageToken;
            }
            catch (Exception e)
            {
                Console.WriteLine("An error occurred: " + e.Message);
                request.PageToken = null;
            }
        } while (!String.IsNullOrEmpty(request.PageToken));
        return result;
    }

It always returns files count = 0 while I'm pretty sure the logged in account has many files! Is there something else required?

Edit: For authentication :

  public static IAuthenticator GetCredentials(String authorizationCode, String state)
    {
        String emailAddress = "";
        try
        {
            IAuthorizationState credentials = ExchangeCode(authorizationCode);
            Userinfo userInfo = GetUserInfo(credentials);
            String userId = userInfo.Id;
            emailAddress = userInfo.Email;
            if (!String.IsNullOrEmpty(credentials.RefreshToken))
            {
                StoreCredentials(userId, credentials);
                return GetAuthenticatorFromState(credentials);
            }
            else
            {
                credentials = GetStoredCredentials(userId);
                if (credentials != null && !String.IsNullOrEmpty(credentials.RefreshToken))
                {
                    return GetAuthenticatorFromState(credentials);
                }
            }
        }
        catch (CodeExchangeException e)
        {
            Console.WriteLine("An error occurred during code exchange.");
            // Drive apps should try to retrieve the user and credentials for the current
            // session.
            // If none is available, redirect the user to the authorization URL.
            e.AuthorizationUrl = GetAuthorizationUrl(emailAddress, state);
            throw e;
        }
        catch (NoUserIdException)
        {
            Console.WriteLine("No user ID could be retrieved.");
        }
        // No refresh token has been retrieved.
        String authorizationUrl = GetAuthorizationUrl(emailAddress, state);
        throw new NoRefreshTokenException(authorizationUrl);
    }

     internal static Google.Apis.Drive.v2.DriveService BuildService(IAuthenticator credentials)
    {
        return new Google.Apis.Drive.v2.DriveService(credentials);
    }

In Controller

  public ActionResult Index(string state, string code)
    {
        try
        {
            List<File> files = new List<File>();
            IAuthenticator authenticator = Utils.GetCredentials(code, state);
            // Store the authenticator and the authorized service in session
            Session["authenticator"] = authenticator;
            DriveService service = Utils.BuildService(authenticator);

            if (authenticator != null && service != null)
            {
                files = GoogleDriveHelper.RetrieveAllFiles(service);
                return View(files);
            }
        }
        catch (CodeExchangeException)
        {
            if (Session["service"] == null || Session["authenticator"] == null)
            {
                Response.Redirect(Utils.GetAuthorizationUrl("", state));
            }
        }
        catch (NoRefreshTokenException e)
        {
            Response.Redirect(e.AuthorizationUrl);
        }
     return View();
   }

解决方案

You have to use the folder id to get files. I use this to get folder files:

string folderid = FindFolder(service, rootFolder,CreatedFolder.Title);
List<ChildReference> listadoFiles = service.Children.List(folderid).Fetch().Items.ToList();

public static string FindFolder(DriveService service,String parentfolderId, string FolderName)
{
    ChildrenResource.ListRequest request = service.Children.List(parentfolderId);
    request.Q = "mimeType='application/vnd.google-apps.folder' and title='" + FolderName + "' ";
    do
    {
        try
        {
            ChildList children = request.Fetch();

            if (children != null && children.Items.Count > 0)
            {

                return children.Items[0].Id;
            }

            foreach (ChildReference child in children.Items)
            {
                Console.WriteLine("File Id: " + child.Id);
            }
            request.PageToken = children.NextPageToken;
        }
        catch (Exception e)
        {
            Console.WriteLine("An error occurred: " + e.Message);
            request.PageToken = null;
        }
    } while (!String.IsNullOrEmpty(request.PageToken));

    return string.Empty;
}

这篇关于使用.NET SDK检索的文件谷歌驱动器列表的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！