我无法在Google云端硬盘Api中检索子文件夹值。它仍然给我文件夹为子的父文件夹的值。
Parent Folder=>OMS => 1)Insider(folder)
2)about1.jpeg(pic)
3)View Model(spreadsheet) Child=> Insider=> 1) Insider document(spreadsheet)
我的代码：
static void Main(string[] args)
{
//Create User Credentials
UserCredential credential= GetUserCredential();
// Create Drive API service.
var service = Service(credential);
public static void List_files(DriveService service) {
// Define parameters of request.
FilesResource.ListRequest listRequest = service.Files.List();
listRequest.Q = "('0B3n1HYsqkmgQd1FnUndXaDAwN1U' in parents)";
// listRequest.PageSize = 10;
// listRequest.Fields = "nextPageToken, files(id, name)";
// 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)
{
if (file.MimeType == "application/vnd.google - apps.folder")
{
Console.WriteLine("Its a folder {0} ({1})", file.Name, file.Id);
var folderobj = List_Folder_Files(service, file.Id);
foreach (var file_value in folderobj)
{
Console.WriteLine("Its a folder {0} ({1})", file_value.Name, file_value.Id);
}
}
else {
Console.WriteLine("{0} ({1})({2})", file.Name, file.Id, file.MimeType);
}
/*
if (file.MimeType== "application / vnd.google - apps.document") {
Console.WriteLine("{0}its a folder", file.Name);
} */
}
}
else
{
Console.WriteLine("No files found.");
}
Console.Read();
}
public static IList<Google.Apis.Drive.v3.Data.File> List_Folder_Files(DriveService service,string Folderid)
{
// Define parameters of request.
FilesResource.ListRequest listRequest = service.Files.List();
listRequest.Q = "('0B3n1HYsqkmgQcEVKNVloNG1WZmc' in parents)";
IList<Google.Apis.Drive.v3.Data.File> files = listRequest.Execute()
.Files;
return files;
}
我必须在这里讨论主要问题
对于返回的表格，返回类型是正确的.Q （查询）和List_Folder_Files方法。
在List_Folder_Files方法中，查询不会遍历我传递的子文件夹（Insider），而是给出了与查询父文件夹（OMS）时相同的结果。
答案 0 :(得分：2)
以下代码会将google驱动器上的所有文件列入树状视图。如你所见，我从我的Root目录开始，然后PrettyPrint将递归地运行获取其他记录。
var service = GoogleDriveFileListDirectoryStructure.AuthenticateOauth(clientId, secret, "x");
var allFiles = GoogleDriveFileListDirectoryStructure.ListAll(service, new GoogleDriveFileListDirectoryStructure.FilesListOptionalParms { Q = "('root' in parents)" ,PageSize = 1000});
GoogleDriveFileListDirectoryStructure.PrettyPrint(service, allFiles,"");
这是邮件类。
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.Linq;
using System.Threading;
namespace GoogleDriveSample
{
internal class GoogleDriveFileListDirectoryStructure
{
/// <summary>
/// Authenticate to Google Using Oauth2
/// Documentation https://developers.google.com/accounts/docs/OAuth2
/// Credentials are stored in System.Environment.SpecialFolder.Personal
/// </summary>
/// <param name="clientId">From Google Developer console https://console.developers.google.com</param>
/// <param name="clientSecret">From Google Developer console https://console.developers.google.com</param>
/// <param name="userName">Identifying string for the user who is being authentcated.</param>
/// <returns>SheetsService used to make requests against the Sheets API</returns>
public static DriveService AuthenticateOauth(string clientId, string clientSecret, string userName)
{
try
{
if (string.IsNullOrEmpty(clientId))
throw new ArgumentNullException("clientId");
if (string.IsNullOrEmpty(clientSecret))
throw new ArgumentNullException("clientSecret");
if (string.IsNullOrEmpty(userName))
throw new ArgumentNullException("userName");
// These are the scopes of permissions you need. It is best to request only what you need and not all of them
string[] scopes = new string[] { DriveService.Scope.DriveReadonly }; //View the files in your Google Drive
var credPath = System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal);
credPath = System.IO.Path.Combine(credPath, ".credentials/apiName");
// Requesting Authentication or loading previously stored authentication for userName
var credential = GoogleWebAuthorizationBroker.AuthorizeAsync(new ClientSecrets { ClientId = clientId, ClientSecret = clientSecret }
, scopes
, userName
, CancellationToken.None
, new FileDataStore(credPath, true)).Result;
// Returning the SheetsService
return new DriveService(new BaseClientService.Initializer()
{
HttpClientInitializer = credential,
ApplicationName = "Drive Oauth2 Authentication Sample"
});
}
catch (Exception ex)
{
Console.WriteLine("Create Oauth2 account DriveService failed" + ex.Message);
throw new Exception("CreateServiceAccountDriveFailed", ex);
}
}
public class FilesListOptionalParms
{
/// The source of files to list.
public string Corpus { get; set; }
/// A comma-separated list of sort keys. Valid keys are 'createdTime', 'folder', 'modifiedByMeTime', 'modifiedTime', 'name', 'quotaBytesUsed', 'recency', 'sharedWithMeTime', 'starred', and 'viewedByMeTime'. Each key sorts ascending by default, but may be reversed with the 'desc' modifier. Example usage: ?orderBy=folder,modifiedTime desc,name. Please note that there is a current limitation for users with approximately one million files in which the requested sort order is ignored.
public string OrderBy { get; set; }
/// The maximum number of files to return per page.
public int PageSize { get; set; }
/// The token for continuing a previous list request on the next page. This should be set to the value of 'nextPageToken' from the previous response.
public string PageToken { get; set; }
/// A query for filtering the file results. See the "Search for Files" guide for supported syntax.
public string Q { get; set; }
/// A comma-separated list of spaces to query within the corpus. Supported values are 'drive', 'appDataFolder' and 'photos'.
public string Spaces { get; set; }
}
/// <summary>
/// Lists or searches files.
/// Documentation https://developers.google.com/drive/v3/reference/files/list
/// Generation Note: This does not always build correctly. Google needs to standardize things I need to figure out which ones are wrong.
/// </summary>
/// <param name="service">Authenticated Drive service. </param>
/// <param name="optional">The optional parameters. </param>
/// <returns>FileListResponse</returns>
public static Google.Apis.Drive.v3.Data.FileList ListAll(DriveService service, FilesListOptionalParms optional = null)
{
try
{
// Initial validation.
if (service == null)
throw new ArgumentNullException("service");
// Building the initial request.
var request = service.Files.List();
// Applying optional parameters to the request.
request = (FilesResource.ListRequest)SampleHelpers.ApplyOptionalParms(request, optional);
var pageStreamer = new Google.Apis.Requests.PageStreamer<Google.Apis.Drive.v3.Data.File, FilesResource.ListRequest, Google.Apis.Drive.v3.Data.FileList, string>(
(req, token) => request.PageToken = token,
response => response.NextPageToken,
response => response.Files);
var allFiles = new Google.Apis.Drive.v3.Data.FileList();
allFiles.Files = new List<Google.Apis.Drive.v3.Data.File>();
foreach (var result in pageStreamer.Fetch(request))
{
allFiles.Files.Add(result);
}
return allFiles;
}
catch (Exception Ex)
{
throw new Exception("Request Files.List failed.", Ex);
}
}
public static void PrettyPrint(DriveService service, Google.Apis.Drive.v3.Data.FileList list, string indent)
{
foreach (var item in list.Files.OrderBy(a => a.Name))
{
Console.WriteLine(string.Format("{0}|-{1}", indent, item.Name));
if (item.MimeType == "application/vnd.google-apps.folder")
{
var ChildrenFiles = ListAll(service, new FilesListOptionalParms { Q = string.Format("('{0}' in parents)", item.Id), PageSize = 1000 });
PrettyPrint(service, ChildrenFiles, indent + " ");
}
}
}
}
public class SampleHelpers
{
/// <summary>
/// Using reflection to apply optional parameters to the request.
///
/// If the optonal parameters are null then we will just return the request as is.
/// </summary>
/// <param name="request">The request. </param>
/// <param name="optional">The optional parameters. </param>
/// <returns></returns>
public static object ApplyOptionalParms(object request, object optional)
{
if (optional == null)
return request;
System.Reflection.PropertyInfo[] optionalProperties = (optional.GetType()).GetProperties();
foreach (System.Reflection.PropertyInfo property in optionalProperties)
{
// Copy value from optional parms to the request. They should have the same names and datatypes.
System.Reflection.PropertyInfo piShared = (request.GetType()).GetProperty(property.Name);
piShared.SetValue(request, property.GetValue(optional, null), null);
}
return request;
}
}
}