如何在 C# 中列出来自 Google Drive API V3 的 1000 多条记录 [英] How to list of more than 1000 records from Google Drive API V3 in C#

问题描述

这是此 链接.

通过下面的代码，我可以获取 1000 条记录，但我的驱动器中总共有 6500++ 条记录.搜索谷歌但无法找到正确的解决方案.

Through the below code, I can able to fetch 1000 records but I have in total 6500++ records in my drive. Searching google but unable to find out the correct solution.

根据参考，参数pageSize"的描述值为每页返回的最大文件数.可接受的值为 1 到 1000，包括 1 到 1000.(默认值:100)".

As per reference, the description value of Parameter "pageSize" is "The maximum number of files to return per page. Acceptable values are 1 to 1000, inclusive. (Default: 100)".

所以这意味着，我们只能得到 1000 条记录，或者如果可能的话，那是什么方法.另外，我不明白参数pageToken"，nextPageToken"值的实时用途是什么.

So it means, we can get only 1000 records or if possible, then what's the way. Also, I don't understand about the Parameter "pageToken", what's the usage of 'nextPageToken' value in realtime.

代码:(https://developers.google.com/drive/v3/web/quickstart/dotnet)

namespace gDrive
{
    class Program
    {
        static string[] Scopes = { DriveService.Scope.DriveReadonly };
        static string ApplicationName = "Drive API .NET Quickstart";

    static void Main(string[] args)
    {
        UserCredential credential;
        gDriveTableAdapter gDrive = new gDriveTableAdapter();

        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 = 1000;
        listRequest.Fields = "nextPageToken, files(webViewLink, name)";

        // List files.
        IList<Google.Apis.Drive.v3.Data.File> files = listRequest.Execute()
            .Files;
        Console.WriteLine("Processing...\n");
        if (files != null && files.Count > 0)
        {
            foreach (var file in files)
            {
                gDrive.InsertQuery(file.Name, file.WebViewLink);
            }
            Console.WriteLine(files.Count + " records fetched.");
        }
        else
        {
            Console.WriteLine("No files found.");
        }
        Console.Read();
    }
  }
}

推荐答案

通过 Google Script 实现.感谢 mesgarpour(链接).

Achieved thru Google Script. Thanks to mesgarpour (link).

var folderId = "Enter the Folder Id here";

// Main function 1: List all folders, & write into the current sheet.
function listFolders(){
  getFolderTree(folderId, false);
};

// Main function 2: List all files & folders, & write into the current sheet.
function listAll(){
  getFolderTree(folderId, true); 
};

// =================
// Get Folder Tree
function getFolderTree(folderId, listAll) {
  try {
    // If you want to search from the top (root) folder
    var parentFolder = DriveApp.getRootFolder();

    // If you want a tree of any sub folder
    //var parentFolder = DriveApp.getFolderById(folderId);

    // Initialise the sheet
    var file, data, sheet = SpreadsheetApp.getActiveSheet();
    sheet.clear();
    sheet.appendRow(["Full Path", "Name", "Date", "URL", "Last Updated", "Description", "Size"]);

    // Get files and folders
    getChildFolders(parentFolder.getName(), parentFolder, data, sheet, listAll);

  } catch (e) {
    Logger.log(e.toString());
  }
};

// Get the list of files and folders and their metadata in recursive mode
function getChildFolders(parentName, parent, data, sheet, listAll) {
  var childFolders = parent.getFolders();

  // List folders inside the folder
  while (childFolders.hasNext()) {
    var childFolder = childFolders.next();
    // Logger.log("Folder Name: " + childFolder.getName());
    data = [ 
      parentName + "/" + childFolder.getName(),
      childFolder.getName(),
      childFolder.getDateCreated(),
      childFolder.getUrl(),
      childFolder.getLastUpdated(),
      childFolder.getDescription(),
      childFolder.getSize()
    ];
    // Write
    sheet.appendRow(data);

    // List files inside the folder
    var files = childFolder.getFiles();
    while (listAll & files.hasNext()) {
      var childFile = files.next();
      // Logger.log("File Name: " + childFile.getName());
      data = [ 
        parentName + "/" + childFolder.getName() + "/" + childFile.getName(),
        childFile.getName(),
        childFile.getDateCreated(),
        childFile.getUrl(),
        childFile.getLastUpdated(),
        childFile.getDescription(),
        childFile.getSize()
      ];
      // Write
      sheet.appendRow(data);
    }

    // Recursive call of the subfolder
    getChildFolders(parentName + "/" + childFolder.getName(), childFolder, data, sheet, listAll);  
  }
};

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