Read XML metadata from ExifTool in C#

Question

This is my C# code that calls Exiftool to obtain the XML metadata of a file:

...
try
{
    // exiftool output in UTF8, use chcp 65001 in console
    string args = String.Format("-X "{0}"", file);
    ProcessStartInfo pi = new ProcessStartInfo("exiftool.exe", args)
    {
        StandardOutputEncoding = Encoding.UTF8,
        StandardErrorEncoding = Encoding.UTF8,
        RedirectStandardOutput = true,
        RedirectStandardError = true,
        UseShellExecute = false,
        CreateNoWindow = true
    };
    using (Process proc = new Process())
    {
        proc.StartInfo = pi;
        // read output and error in async mode
        proc.OutputDataReceived += (sender, e) => stdout += e.Data;
        proc.ErrorDataReceived += (sender, e) => stderr += e.Data;
        proc.Start();
        proc.BeginOutputReadLine();
        proc.BeginErrorReadLine();
        if (proc.WaitForExit(10000))
        {
            if (proc.ExitCode == 0)
            {
                xml.LoadXml(stdout); // can raise error!!!
            }
            else
            {
                stderr = proc.StandardError.ReadToEnd();
                throw new Exception(stderr);
            }
            proc.Close();
        }
        else
        {
            proc.Kill();
            throw new Exception("timeout");
        }
    }
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
}

It can process more than a thousand files a day correctly and yet in some it produces this error indicating that the XML is not correctly closed.

ERROR. Unexpected end of file has occurred. The following elements are not closed: rdf:Description, rdf:RDF. Line 1, position 7948.

Is there any other way to extract the metadata from a file in XML?