C#•2w ago

✅ Content would exceed Content-Length

I have this code to add files to an HttpClient to send API requests to an external API.

c#
    public void AddFile(string filePath, string fileName) {
      // Open the file stream
      FileStream fileStream = new(filePath, FileMode.Open, FileAccess.Read);
      _fileStreams.Add(fileStream);

      // Create stream content and add it to the form data.
      StreamContent streamContent = new(fileStream);
      streamContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
      _formData.Add(streamContent, "file", fileName);
    }

c#
    public void AddFile(string filePath, string fileName) {
      // Open the file stream
      FileStream fileStream = new(filePath, FileMode.Open, FileAccess.Read);
      _fileStreams.Add(fileStream);

      // Create stream content and add it to the form data.
      StreamContent streamContent = new(fileStream);
      streamContent.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
      _formData.Add(streamContent, "file", fileName);
    }

The problem I have, is that I am getting the error Unable to write content to request stream; content would exceed Content-Length. Now, in some cases, the automated Content-Length value being set was incorrect. I have tried manually setting the content length with streamContent.Headers.ContentLength = fileStream.Length and while this does correctly set the size, I still get the same error that it would exceed the length. I'm not sure why that's occurring.

2 Replies

engineertdog•2w ago

Figured out my problem. I was clearing my _fileStreams, but I needed to also _formData.Dispose() and then create a new object.

MODiX•2w ago

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✅ Content would exceed Content-Length