我如何使用 c# 从谷歌驱动器 api 获取文件夹的完整路径

Question

我如何使用 google drive api c# 获取文件夹的完整路径。假设我想要一个 .net 列表，其中包含 Folder 类，而 Folder 是一个具有 2 个属性的类。URL 和文件夹名称。如果问题不好/愚蠢，我对此很陌生，所以很抱歉。在这一点上，任何事情都会有所帮助。

Answer 1

github.com/prasmussen/gdrive/上有一个很棒的命令行可用于使用 google drive

该代码库中存在用于从每个文件向上遍历目录树并构建完整路径的逻辑。

我遵循了.NET Quickstart说明，然后将相关的 go-lang 代码从path.go转换为下面的 C# 等效代码。

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

namespace DriveQuickstart
{
    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 DriveService service;
        static Dictionary<string, Google.Apis.Drive.v3.Data.File> files = new Dictionary<string, Google.Apis.Drive.v3.Data.File>();

        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.
            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, parents)";

            // 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)
                {
                    var absPath = AbsPath(file);
                    Console.WriteLine("{0} ({1})", absPath, file.Id);
                }
            }
            else
            {
                Console.WriteLine("No files found.");
            }
            Console.Read();

        }

        private static object AbsPath(Google.Apis.Drive.v3.Data.File file)
        {
            var name = file.Name;

            if (file.Parents.Count() == 0)
            {
                return name;
            }

            var path = new List<string>();

            while (true)
            {
                var parent = GetParent(file.Parents[0]);

                // Stop when we find the root dir
                if (parent.Parents == null || parent.Parents.Count() == 0)
                {
                    break;
                }

                path.Insert(0, parent.Name);
                file = parent;
            }
            path.Add(name);
            return path.Aggregate((current, next) => Path.Combine(current, next));
        }

        private static Google.Apis.Drive.v3.Data.File GetParent(string id)
        {
            // Check cache
            if (files.ContainsKey(id))
            {
                return files[id];
            }

            // Fetch file from drive
            var request = service.Files.Get(id);
            request.Fields = "name,parents";
            var parent = request.Execute();

            // Save in cache
            files[id] = parent;

            return parent;
        }
    }
}