Htykuut

I'm going insane trying to understand why I can't write a new file. I've found some examples which say to write files following this like this:

public void WriteFile(string filename, IEnumerable<string> paragraphs)

{

    var docStream = new POIFSFileSystem(File.OpenRead("empty.doc"));

    var doc = new HWPFDocument(docStream);

    var range = doc.GetRange();

    foreach (var para in paragraphs)

    {

        range.InsertAfter(para);



    }



    DocumentSummaryInformation dsi = doc.DocumentSummaryInformation;

    var cp = dsi.CustomProperties;

    if (cp == null)

        cp = new NPOI.HPSF.CustomProperties();

    cp.Put("myProperty", "foo bar baz");



    doc.Write(File.OpenWrite(filename));



}

After the execution of that method I want to read all the bytes from a file and return the content to the browser which invoked all this (from ASP.NET CORE):

byte fileBytes = System.IO.File.ReadAllBytes(path);

var result = File(fileBytes, "application/msword", path);



//System.IO.File.Delete(path);



var retObj = Newtonsoft.Json.JsonConvert.SerializeObject(new {filePath = path});

return Task.FromResult(retObj);

The ReadAllBytes line as well as an attempt to open the file from Windows Explorer whilst debugging gives an error about the file being in use by another process. If I stop the website execution and try explorer again I'm told the file is corrupt! None of the NPOI classes are disposable here and the POIFSFileSystem.Close method from POI isn't implemented in NPOI so I have to assume it's closed implicitly.

Anyone know how to cleanly close and release the file?
Or can anyone recommend a 'good' library that isn't so mysterious to use for processing and creating MS Office documents?