When reading a CSV file in DropBox using dotnet maui, the data becomes HTML instead of the contents of the CSV file.

Question

string fileUrl = "https://www.dropbox.com/scl/fi/sulYYYYYYYYY/XXXX.csv?dl=1";

string localPath = Path.Combine(FileSystem.Current.AppDataDirectory, "XXXX.csv");

System.Diagnostics.Debug.WriteLine($"Local file path: {localPath}");

try

{ // download of the file

var response = await client.GetAsync(fileUrl);

response.EnsureSuccessStatusCode();

//

var fileBytes = await response.Content.ReadAsByteArrayAsync();

//

await File.WriteAllBytesAsync(localPath, fileBytes);

Debug.WriteLine("The download was successful."); }

catch (Exception ex)

{

Debug.WriteLine("Download failed.");

Debug.WriteLine($"Error: {ex.Message}"); }

Answer 1

Hello,

If you need to read files from DropBox or NetDisk, you need to use the API provided by the NetDisk service provider to realize this function.

For Dropbox you can refer to the section on downloading files in the official .net API documentation provided by DropBox.

• Dropbox for .NET Developers

//To download a file:

async Task Download(DropboxClient dbx, string folder, string file)
{
    using (var response = await dbx.Files.DownloadAsync(folder + "/" + file))
    {
        Console.WriteLine(await response.GetContentAsStringAsync());
    }
}

Best Regards,

Alec Liu.

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Answer 2

I solved the problem.

1. Sign in to DropBox and create an app with a suitable app name (I named it 'CSVFileApp'). Check the app in the Dropbox developer console Dropbox Developers' https://www.dropbox.com/developers/apps', click to open the app, open Permission type Scoped App, check files.content.write, check files.content.read, check file_requests.write, check file_requests.read with a gray check, check contacts.write, check contacts.read with a gray check, and click Submit to set the scope of this app.

Go back to 'https://www.dropbox.com/developers/apps' and open the app you created again, generate an access token, and save it.

From here, use dotnet maui to upload the necessary CSV files to this app. I tried to do this process manually, but it meant that I couldn't download anything later.

However, the access token for downloading CSV from DropBox will change after 1-2 days and will no longer be usable, so I will withdraw from the free DropBox service.

Thank you.