Null response creating file using Google Drive .NET API

Question

I am trying to upload a file onto my Drive using Google Drive .NET API v3. My code is below

static string[] Scopes = { DriveService.Scope.Drive,
                         


        

Answer 1

Have a look at what request.Upload() returns. For me when I was having this issue it returned:

Insufficient Permission Errors [Message[Insufficient Permission] Location[ - ]

I changed my scope from DriveService.Scope.DriveReadonly to DriveService.Scope.Drive and I was in business.

Answer 2

Try to visit this post from ASP.NET forum.

The same idea as what you want to do in your app, since you are dealing with uploading a file in Google Drive using .net.

You may try to call rest api directly to achieve your requirement :

The quickstart from .net will help you to make requests from/to the Drive API.

Upload Files:

The Drive API allows you to upload file data when create or updating a File resource.

You can send upload requests in any of the following ways:

• Simple upload: uploadType=media. For quick transfer of a small file (5 MB or less). To perform a simple upload, refer to Performing a Simple Upload.
• Multipart upload: uploadType=multipart. For quick transfer of a small file (5 MB or less) and metadata describing the file, all in a single request. To perform a multipart upload, refer to Performing a Multipart Upload.
• Resumable upload: uploadType=resumable. For more reliable transfer, especially important with large files. Resumable uploads are a good choice for most applications, since they also work for small files at the cost of one additional HTTP request per upload. To perform a resumable upload, refer to Performing a Resumable Upload.

You may try this code from the documentation on uploading sample file.

var fileMetadata = new File()
{
    Name = "photo.jpg"
};
FilesResource.CreateMediaUpload request;
using (var stream = new System.IO.FileStream("files/photo.jpg",
                        System.IO.FileMode.Open))
{
    request = driveService.Files.Create(
        fileMetadata, stream, "image/jpeg");
    request.Fields = "id";
    request.Upload();
}
var file = request.ResponseBody;
Console.WriteLine("File ID: " + file.Id);

You may check the errors you may encounter in this documentation.

Answer 3

    string[] Scopes = { DriveService.Scope.Drive };

• Change the Drive scope then delete the file token.json
• in vs2017 you can see token.json file in token.json folder when client_secret.json file present.

Answer 4

Change static string[] Scopes = { DriveService.Scope.DriveReadonly }; to static string[] Scopes = { DriveService.Scope.Drive };.

After changes, take a look into token.json file and check does it change its scope from DriveReadonly to Drive.

If you are seeing DriveReadonly then delete the token.json file and run the application again.