Question

因此，我在C＃中关注Google Drive API Rest Google´s step-by-step。我基本上想从我的控制台C＃应用程序中列出我的Google云端硬盘中的文件。

我创建了Oauth2凭据，下载了json文件，导入到我的Visual Studio项目中，使用NuGet管理器安装了Google Drive API v3，复制并粘贴了C＃代码（如下）。但是我在GoogleWebAuthorizationBroker.AuthorizeAsync（）方法中不断收到错误{“访问被拒绝”}（在innerException中）。有人可以帮帮我吗？

我的C＃代码：

using Google.Apis.Auth.OAuth2;
using Google.Apis.Drive.v3;
using Google.Apis.Drive.v3.Data;
using Google.Apis.Services;
using Google.Apis.Util.Store;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace Drive_API_Quickstart__2nd_attempt_
{
    class Program
    {
        // If modifying these scopes, delete your previously saved credentials
        // at ~/.credentials/drive-dotnet-quickstart.json
        static string[] Scopes = { DriveService.Scope.DriveReadonly };
        static string ApplicationName = "Drive API .NET Quickstart";

        static void Main(string[] args)
        {
            UserCredential credential;

            using (var stream =
                new FileStream("client_secret.json", FileMode.Open, FileAccess.Read))
            {
                string credPath = System.Environment.GetFolderPath(
                    System.Environment.SpecialFolder.Personal);
                credPath = Path.Combine(credPath, ".credentials/drive-dotnet-quickstart.json");

                credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
                    GoogleClientSecrets.Load(stream).Secrets,
                    Scopes,
                    "user",
                    CancellationToken.None,
                    new FileDataStore(credPath, true)).Result;
                Console.WriteLine("Credential file saved to: " + credPath);
            }

            // Create Drive API service.
            var service = new DriveService(new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = ApplicationName,
            });

            // Define parameters of request.
            FilesResource.ListRequest listRequest = service.Files.List();
            listRequest.PageSize = 10;
            listRequest.Fields = "nextPageToken, files(id, name)";

            // List files.
            IList<Google.Apis.Drive.v3.Data.File> files = listRequest.Execute()
                .Files;
            Console.WriteLine("Files:");
            if (files != null && files.Count > 0)
            {
                foreach (var file in files)
                {
                    Console.WriteLine("{0} ({1})", file.Name, file.Id);
                }
            }
            else
            {
                Console.WriteLine("No files found.");
            }
            Console.Read();

        }
    }
}

调试错误：

System.AggregateException was unhandled
  HResult=-2146233088
  Message=One or more errors occurred.
  Source=mscorlib
  StackTrace:
       at System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
       at System.Threading.Tasks.Task`1.GetResultCore(Boolean waitCompletionNotification)
       at System.Threading.Tasks.Task`1.get_Result()
       at Drive_API_Quickstart__2nd_attempt_.Program.Main(String[] args) in W:\Adriano\Visual Studio\Google Drive\Drive API Quickstart (2nd attempt)\Drive API Quickstart (2nd attempt)\Program.cs:line 34
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
  InnerException: 
       ErrorCode=5
       HResult=-2147467259
       Message=Access is denied
       NativeErrorCode=5
       Source=System
       StackTrace:
            at System.Net.HttpListener.AddAllPrefixes()
            at System.Net.HttpListener.Start()
            at Google.Apis.Auth.OAuth2.LocalServerCodeReceiver.StartListener()
            at Google.Apis.Auth.OAuth2.LocalServerCodeReceiver.<ReceiveCodeAsync>d__8.MoveNext()
         --- End of stack trace from previous location where exception was thrown ---
            at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
            at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
            at Google.Apis.Auth.OAuth2.AuthorizationCodeInstalledApp.<AuthorizeAsync>d__8.MoveNext()
         --- End of stack trace from previous location where exception was thrown ---
            at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
            at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
            at Google.Apis.Auth.OAuth2.GoogleWebAuthorizationBroker.<AuthorizeAsync>d__4.MoveNext()
         --- End of stack trace from previous location where exception was thrown ---
            at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
            at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
            at Google.Apis.Auth.OAuth2.GoogleWebAuthorizationBroker.<AuthorizeAsync>d__1.MoveNext()
       InnerException:

Answer 1

您是否正确尝试过此实施授权？

您提到的document quickstart有关于身份验证的一些注意事项：

注释

授权信息存储在文件系统中，因此随后   执行不会提示授权。授权流程   在此示例中，它是为命令行应用程序设计的。对于   有关如何在Web应用程序中执行授权的信息，请参阅   图书馆OAuth 2.0指南的web applications section。

另外，请按照document about OAuth：

的步骤进行操作

要查找OAuth 2.0凭据的重定向URI，请执行以下操作：   以下内容：

1。）在API控制台中打开“凭据”页面。

2.如果您尚未这样做，请点击创建凭据＆gt;创建您的OAuth 2.0凭据。 OAuth客户端ID。

3.。）创建凭据后，通过单击OAuth 2.0中的客户端ID（对于Web应用程序）来查看或编辑重定向URL   客户ID部分。

您可能会错过这些步骤。您也可能拥有 client_secrets.json 的错误文件。请问您是如何实际下载该文件的？

Answer 2

我遇到了与Windows桌面程序相同的问题。当我从调试器中搜索它时它没有工作。然后我使用＆＃34;以管理员身份运行＆＃34; 选项解决了问题。它弹出了谷歌帐户选择窗口。这是我的代码。确保正确选择验证密钥。

void GoogleThread()
    {
        try
        {
            //Scopes for use with the Google Drive API
            string[] scopes = new string[] { 
                             DriveService.Scope.DriveFile};
            var clientId = "Create auth0 Id and copy here";      // From https://console.developers.google.com
            var clientSecret = "";          // From https://console.developers.google.com

            // here is where we Request the user to give us access, or use the Refresh Token that was previously stored in %AppData%
            GoogleWebAuthorizationBroker.Folder = "Drive.Sample";
            var credential = GoogleWebAuthorizationBroker.AuthorizeAsync(new ClientSecrets
            {
                ClientId = clientId,
                ClientSecret = clientSecret
            },

            scopes,
            "Admin",
            CancellationToken.None,
            new FileDataStore("Daimto.GoogleDrive.Auth.Store")).Result;

            var service = new DriveService(new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = "Drive API Sample",
            });

            uploadFile(service, "d:\\bmjo\\EastManTemp.xml", "0B1HV_LVO8x0zSWFrRkE2LVFUQ2c");

        }
        catch (Exception exp)
        {
            MessageBox.Show(exp.Message, "Error");
        }
    }
    // tries to figure out the mime type of the file.
    private static string GetMimeType(string fileName)
    {
        string mimeType = "application/unknown";
        string ext = System.IO.Path.GetExtension(fileName).ToLower();
        Microsoft.Win32.RegistryKey regKey = Microsoft.Win32.Registry.ClassesRoot.OpenSubKey(ext);
        if (regKey != null && regKey.GetValue("Content Type") != null)
            mimeType = regKey.GetValue("Content Type").ToString();
        return mimeType;
    }
    public static File uploadFile(DriveService _service, string _uploadFile, string _parent)
    {

        if (System.IO.File.Exists(_uploadFile))
        {
            File body = new File();

            body.Title = System.IO.Path.GetFileName(_uploadFile);
            body.Description = "File uploaded by Diamto Drive Sample";
            body.MimeType = GetMimeType(_uploadFile);
            body.Parents = new List<ParentReference>();// { new ParentReference() { Id = _parent } };
            body.Parents.Add(new ParentReference() { Id = _parent });
            // File's content.
            byte[] byteArray = System.IO.File.ReadAllBytes(_uploadFile);
            System.IO.MemoryStream stream = new System.IO.MemoryStream(byteArray);
            try
            {
                FilesResource.InsertMediaUpload request = _service.Files.Insert(body, stream, GetMimeType(_uploadFile));
                request.Upload();
                return request.ResponseBody;
            }
            catch (Exception e)
            {
                Console.WriteLine("An error occurred: " + e.Message);
                return null;
            }
        }
        else
        {
            Console.WriteLine("File does not exist: " + _uploadFile);
            return null;
        }

    }
    private void button1_Click(object sender, EventArgs e)
    {
        Thread thread = new Thread(new ThreadStart(GoogleThread));
        thread.Start();

    }

使用Google Drive API的C＃：{“访问被拒绝”}

2 个答案: