Uploading files on Dropbox using C# in ASP.NET - oauth-2.0

Question

RequestResult strReq = OAuthUtility.Put(
"https://content.dropboxapi.com/1/files_put/auto/",
new HttpParameterCollection {
{"access_token",MYAccessToken},
{"path",Path.Combine(this.CurrentPath, Path.GetFileName(#"C:\test\jj.kk\Downloads\1990480.jpg")).Replace("\\","/")},
{"overwrite","true"},
{"autorename","true"}
}
);
I am using above code for uploading file on Dropbox but giving following error:
The remote server returned an error: (400) Bad Request.
RequestResult : { "error": "Content-Type (application/x-www-form-urlencoded) may not be one of (\'application/x-www-form-urlencoded\', \'multipart/form-data\')" }
Httpheader :
{Transfer-Encoding: chunked
Connection: keep-alive
X-Dropbox-Request-Id: 4029d2ae041cf1f25d8f58d06d158b83
X-Robots-Tag: noindex, nofollow, noimageindex
Content-Type: application/json
Date: Fri, 07 Oct 2016 15:24:17 GMT
Server: nginx
}
Is there any other way of uploading files on Dropbox in ASP.NET?

Answer 1

The error message you're getting is indicating that the issue with your API request is that the Content-Type has an unexpected value. That is, you (via the library you're using, presumably) are sending application/x-www-form-urlencoded. That isn't an allowed format for the Dropbox API /1/files_put endpoint, which expects the raw file data in the body of the request.
To answer your actual question though, there is another way to upload to Dropbox in ASP.NET. You can use Dropbox API v2, instead of Dropbox API v1 as you have here. (And in fact you should, since Dropbox API v1 is deprecated.)
To do so, we highly recommend using the official SDK:
https://www.dropbox.com/developers/documentation/dotnet
Alternatively, you can use the HTTP endpoints directly, e.g.,:
https://www.dropbox.com/developers/documentation/http/documentation#files-upload