Returning a stream from Swagger generated c# server

[Dombat]

I put this on Stackoverflow yesterday, but this is probably a better place for it!

Swagger has generated a server from an API with a method like this:

[HttpGet]
    [Route("SomeRoute")]
    [SwaggerOperation("GetFile")]
    [SwaggerResponse(200, type: typeof(System.IO.Stream))]
    public virtual IActionResult GetFile()
    {
        string exampleJson = null;
        string text = "This could be the contents of a file";

        exampleJson = text;
        var example = exampleJson != null
        ? JsonConvert.DeserializeObject<System.IO.Stream>(exampleJson)
        : default(System.IO.Stream);
        return new ObjectResult(example);
    }

If I replace string text = "This could be the contents of a file" with lines of code such as:

var stream = new FileStream(@".\Files\test.txt", FileMode.Open, FileAccess.Read);
string text = new StreamReader(stream,Encoding.ASCII,true).ReadToEnd();

I get a JsonConvert exception saying "invalid characters" (because the string is the content of the file and not json!) If I try and return a stream (e.g. a fileStream) I get an exception too.

What is the correct way to return a stream from swagger generated code in C#?

[Dombat]

This seemed to work for me

            var stream = new FileStream(@".\Files\test.txt", FileMode.Open, FileAccess.Read);

            var reader = new StreamReader(stream, Encoding.ASCII, true);
           
            return new ObjectResult(reader.BaseStream);