如何使用C＃GData API通过密钥请求单个电子表格？

Question

我有一个认证程序，可以获取使用GData API的C＃实现版本3的所有电子表格的列表（它遵循文档中的the example）。我很难弄清楚如何通过它的文档键来获取单个资源。我可以在Google Documents List API中看到很多检索文档列表的例子，我可以看到如何通过exact name search将文档清零，但我试图生成一些代码，这些代码在重新命名的电子表格中生存。这里是我到目前为止已经编写的代码：

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

我没有测试这一点，但根据本https://developers.google.com/gdata/client-cs您可以通过使用其URL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，如果您在文档的关键，你也有URL（https://docs.google.com/spreadsheet/ccc?key=[insert这里的关键]） 你可以使用一个简单的

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]; 

而且您应该能够检索文档。 如果你想保存文档到硬盘驱动器，只需添加

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

我得罪了Google.Apis.Drive.v2客户端库NuGet包版本1.9.2.1890测试此。但是需要注意的是，您现在需要通过Google Developer's Console发现的here，向您的应用程序注册开发人员的帐户并使用Google API和设置API访问权限和凭据。

如果你只想用这个服务帐户又名不能代表用户，但对于自动化或内部工具访问文件，使用这样的：

（如果我没有记错的服务帐户仍需要由通过OAuth的浏览器弹出一个人一次性的OAuth认证的交互的应用程序添加到服务帐户授权的应用程序）

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); 
} 

要访问代表用户的文件，你会需要像这可以建立您的服务：

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; 
} 

老答案留给后人的缘故（老谷歌的GData API已被弃用，下面这点东西不再是相关的，不应该被预期工作）：

我有同样的问题找到文档密钥。我最终在AlternateUri中找到了它。这里是我做了什么（这已被编译并确认一个新的项目工作，并添加GData.Spreadsheets用的NuGet）：

//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(); 
} 

我应该指出，这需要LINQ（.NET Framework 3.5或更高版本），由于到.Cast<SpreadsheetEntry>().FirstOrDefault()一行。这可以在没有LINQ的情况下完成，您只需手动枚举电子表格并找到您正在查找的电子表格，而不是使用一行代码执行此操作。我只是想确保在他们开始报告它不起作用之前，每个人都知道。