Object reference not set to an instance of an object.

Hi, I'm experiencing the issue that uploading Pdf to the box by API by C#.

While uploading I am getting an unexpected error that Object reference not set to an instance of an object.

I Want just to upload a Pdf and get a Sharable Link with download and view.

Thank you very much.

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Here is My Code

 var config = new BoxConfigBuilder(<Client_Id>, <Client_Secret>, new Uri("https://developer.box.com/auth/callback")).Build();
            var client = new BoxClient(config);
            BoxFile newFile;
            using (FileStream stream = new FileStream(@"C:\\Users\\Dhanraj Kumar\\Desktop\\Test.pdf", FileMode.Open))
            {
                BoxFileRequest req = new BoxFileRequest()
                {
                    Name = "Test.pdf",
                    Parent = new BoxRequestEntity() { Id = "0" }
                };
                newFile = await client.FilesManager.UploadAsync(req, stream);
                String Url = newFile.SharedLink.DownloadUrl;
            }

Peter Christensen

2022年03月04日 09:47

Hi Dhanraj

If you are trying to get the download URL from a shared link you need to create the shared link first. It is not created automatically when you upload a file.

See: https://github.com/box/box-windows-sdk-v2/blob/main/docs/files.md#create-a-shared-link - this will create a permanent shared link and a download URL as well

You can also use this to get the download URL as well https://github.com/box/box-windows-sdk-v2/blob/main/docs/files.md#get-a-files-download-url but this URL expires after approximately 15 minutes. See https://developer.box.com/guides/downloads/get-url/

So which you use depends on how you are using the download link further in your app

Best regards, Peter Christensen, Platform Solutions Engineer, Box

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