Question

我有一个程序可以验证并可以获取使用GData API的C＃实现版本3的所有电子表格列表（它遵循文档中的the example）。我正在弄清楚的是如何通过它的文档密钥获取单个资源。我可以在Google Documents List API中看到大量检索文档列表的示例，我可以看到如何通过exact name search将其归零到特定文档，但我正在尝试生成一些可以在电子表格中生存的代码被重命名。这是我到目前为止编写的代码：

using System;
using Google.GData.Client;
using Google.GData.Spreadsheets;
using Microsoft.VisualBasic;

namespace q14201622
{
  class Program
  {
    static void Main(string[] args)
    {
      //OAuth 2 Stuff
      var parameters = new OAuth2Parameters() {
        ClientId = CLIENT_ID,
        ClientSecret = CLIENT_SECRET,
        RedirectUri = REDIRECT_URI,
        Scope = SCOPE
      };
      Process.Start(OAuthUtil.CreateOAuth2AuthorizationUrl(parameters));
      var response = Interaction.InputBox("Enter oAuth Code:", "q14201622", "", 0, 0);
      parameters.AccessCode = response;
      OAuthUtil.GetAccessToken(parameters);
      var accessToken = parameters.AccessToken;

      //Fetch Documents
      var requestFactory = new GOAuth2RequestFactory(null, "q14201622-v1", parameters);
      var service = new SpreadsheetsService("q14201622-v1");
      var query = new SpreadsheetQuery();
      query.Title = "Exact Title";
      query.Exact = true;

      //Iterate over the results
      var feed = service.Query(query);
      foreach (var entry in feed.Entries)
      {
        Console.WriteLine(entry.Id + ":"+ entry.Title.Text);
      }
    }
  }
}

Answer 1

我没有对此进行测试，但根据此https://developers.google.com/gdata/client-cs，您可以使用其网址请求特定条目：

FeedQuery singleQuery = new FeedQuery();
singleQuery.Uri = new Uri(newEntry.SelfUri.ToString()); 
AtomFeed newFeed = service.Query(singleQuery);
AtomEntry retrievedEntry = newFeed.Entries[0];

现在，如果你有文档密钥，那么你也有URL（https://docs.google.com/spreadsheet/ccc?key=[insert key here））你可以用一个简单的

string docKey = "nice doc key";
string  gDocsURL = "https://docs.google.com/spreadsheet/ccc?key={0}";
string docURL = String.Format(gDocsURL,docKey);

然后

FeedQuery singleQuery = new FeedQuery();
singleQuery.Uri = new Uri(docURL); 
AtomFeed newFeed = service.Query(singleQuery);
AtomEntry retrievedEntry = newFeed.Entries[0];

您应该能够检索文档。如果要将文档保存到HDD，只需添加

即可

string docFormat ="xlsx";// or xls or csv or pdf etc.
string gDocsDownloadURL="https://spreadsheets.google.com/feeds/download/spreadsheets/Export?key={0}&exportFormat={1}"
string downloadUrl = String.format(gDocsDownloadURL,docKey,docFormat);
Stream stream = service.Query(new Uri(downloadUrl));

Answer 2

我已针对Google.Apis.Drive.v2客户端库nuget软件包版本1.9.2.1890对此进行了测试。但需要注意的一点是，您现在需要通过Google Developer's Console here向您的应用注册开发人员帐户，并为您的应用设置API访问和凭据。

如果您只想将此用于服务帐户，而不是代表用户访问文件，而是用于自动化或内部工具，请使用以下内容：

（如果我没记错，服务帐户仍然需要人工通过OAuth浏览器弹出窗口进行一次性OAuth批准互动，以将应用添加到服务帐户上的授权应用中）

private const string SERVICE_ACCOUNT_EMAIL = "YOUR_SERVICE_ACCOUNT_EMAIL_HERE"; //looks like XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX@developer.gserviceaccount.com;

static DriveService BuildServiceAccountService()
{
  var certificate = new X509Certificate2(PATH_TO_YOUR_X509_CERT,
      "notasecret", X509KeyStorageFlags.Exportable);
  var credential = new ServiceAccountCredential(
      new ServiceAccountCredential.Initializer(SERVICE_ACCOUNT_EMAIL)
      {
          Scopes = new[] { DriveService.Scope.Drive },
          User = "ACTUAL_EMAIL_ADDRESS" // this should be the normal xxxxxx@gmail account that has the google drive files
      }.FromCertificate(certificate));

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

  return service;
}

public static void DownloadSpreadsheetAsXlsx(string spreadsheetName, string filePath)
{
  var service = BuildServiceAccountService();
  var request = service.Files.List();
  request.Q = String.Format("title = '{0}'", spreadsheetName);
  var files = request.Execute();
  var file = files.Items.FirstOrDefault();

  var dlUrl = String.Format("https://docs.google.com/spreadsheets/d/{0}/export?format=xlsx&id={0}", file.Id);

  File.WriteAllBytes(filePath, service.HttpClient.GetByteArrayAsync(dlUrl).Result);
}

要代表用户访问文件，您需要使用以下内容来构建服务：

static DriveService BuildUserAccountService(string userEmail)
{
  UserCredential credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
  new ClientSecrets
  {
     ClientId = "YOUR_CLIENT_ID", // your client Id
     ClientSecret = "YOUR_CLIENT_SECRET", // Your client secret
  },
  new[] { DriveService.Scope.Drive },
  userEmail,
  CancellationToken.None).Result;

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

  return service;
}

旧的答案为了后人的缘故（旧的Google GData API已被弃用，此时的任何内容都不再相关，不应该发挥作用）：

我在查找文档密钥时遇到了同样的问题。我最终在AlternateUri找到了它。这就是我所做的（已经编译并确认在新项目中工作并使用NuGet添加GData.Spreadsheets）：

//Use your authentication method here:    
SpreadsheetsService service = new SpreadsheetsService("DownloadSpreadsheet");
service.setUserCredentials("your username", "your password");

SpreadsheetQuery query = new SpreadsheetQuery();
SpreadsheetFeed feed = service.Query(query);
SpreadsheetEntry fileEntry = feed.Entries.Cast<SpreadsheetEntry>().FirstOrDefault(entry => entry.Title.Text == "Name of spreadsheet");

//This is the good part
string key = fileEntry.AlternateUri.Content.Substring(fileEntry.AlternateUri.Content.IndexOf("?key="));
string dlUrl = "https://docs.google.com/feeds/download/spreadsheets/Export" + key + "&exportFormat=xlsx&format=xlsx";
Stream stream = service.Query(new Uri(dlUrl));
using (FileStream fstream = new FileStream("something.xlsx", FileMode.Create, FileAccess.ReadWrite, FileShare.ReadWrite))
{
    stream.CopyTo(fstream);
    fstream.Flush();
}

我应该提一下，由于.Cast<SpreadsheetEntry>().FirstOrDefault()行，这需要LINQ（.NET Framework 3.5或更高版本）。这可以在没有LINQ的情况下完成，您只需要手动枚举电子表格并找到您要查找的电子表格，而不是使用单行代码来完成它。我只是想确保每个人在开始报告之前都知道它不起作用。

如何通过Key使用C＃GData API请求单个电子表格？

2 个答案: