<C#>Google Drive APIs

第一步，激活Drive API

首先，注册Google帐号；其次，登录Google Developers Console；接着，建立工程和程序；紧接，激活APIs & auth；最后，选择Credentials。

第二步，安装Google Client Library

安装一个NuGet包（Google.Apis.drive）。如在VS2012上，先选择Tools，再NuGet Package Manager，接着Package Manager Console。在PM>中输入Install-Package Google.Apis -Pre,Install-Package Google.Apis.Authentication -Pre,Install-Package Google.Apis.Drive.v2 -Pre。

第三步，编程

using System;
using System.Threading;
using System.Threading.Tasks;

using Google;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Drive.v2;
using Google.Apis.Drive.v2.Data;
using Google.Apis.Services;

namespace GoogleDriveSamples
{
    class DriveCommandLineSample
    {
        static void Main(string[] args)
        {
            UserCredential credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
                new ClientSecrets
                {
                    ClientId = "CLIENT_ID_HERE",
                    ClientSecret = "CLIENT_SECRET_HERE",
                },
                new[] { DriveService.Scope.Drive },
                "user",
                CancellationToken.None).Result;

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

            File body = new File();
            body.Title = "My document";
            body.Description = "A test document";
            body.MimeType = "text/plain";

            byte[] byteArray = System.IO.File.ReadAllBytes("document.txt");
            System.IO.MemoryStream stream = new System.IO.MemoryStream(byteArray);

            FilesResource.InsertMediaUpload request = service.Files.Insert(body, stream, "text/plain");
            request.Upload();

            File file = request.ResponseBody;
            Console.WriteLine("File id: " + file.Id);
            Console.WriteLine("Press Enter to end this process.");
            Console.ReadLine();
        }
    }
}

最后，验证
运行程序后(F5)，跳出APIs申请权限，点击“接受”，就运行OK。

摘自：https://developers.google.com/drive/web/quickstart/quickstart-cs