How to transfer data from the third-level class ?

Question

I need to transfer the data from HTTPServer toWinForm.
I use HTTPServer (https://github.com/jeske/SimpleHttpServer)

 

I transferred the project SimpleHttpServer (https://github.com/jeske/SimpleHttpServer/tree/master/SimpleHttpServer) in your project WinForm.
I run HTTPServer with the following code.
Code.

private void Form1_Load(object sender, EventArgs e)
{
    StartHttpServer();
}

static void StartHttpServer()
{
    try
    {
        var route_config = new List();
        HttpServer httpServer = new HttpServer(8080, route_config);

        Thread thread = new Thread(new ThreadStart(httpServer.Listen));
        thread.Start();
    }
    catch (Exception ex)
    {
        string s = ex.Message;
        string t = ex.StackTrace;
        // throw;
        MessageBox.Show(s + " \r\n " +
            t);
    }
}

If the server receives a POST request with JSON, then the request comes in the class HttpProcessor.cs method HandleClient.

 

Code

public void HandleClient(TcpClient tcpClient)
{
    Stream inputStream = GetInputStream(tcpClient);
    Stream outputStream = GetOutputStream(tcpClient);
    HttpRequest request = GetRequest(inputStream, outputStream);

    #region ??? ?????????.
    // string s = request.
    RequestContent?.Invoke(request);
    #endregion

    // ????????? ? ?????????? ??????... (route and handle the request...)
    HttpResponse response = RouteRequest(inputStream, outputStream, request);

    // *
    //    Console.WriteLine("{0} {1}",response.StatusCode,request.Url);
    // ????????? ????? ?? ????????? ??? ?????? (build a default response for errors)
    if (response.Content == null)
    {
        if (response.StatusCode != "200")
        {
            response.ContentAsUTF8 = string.Format("{0} {1} 
      {2}", response.StatusCode, request.Url, response.ReasonPhrase);
        }
    }

    WriteResponse(outputStream, response);

    outputStream.Flush();
    outputStream.Close();
    outputStream = null;

    inputStream.Close();
    inputStream = null;

}

To get JSON from the HttpProcessor.cs class method HandleClient.

I plan to use the public event Action RequestContent;.

 

Code

public event Action RequestContent;

public void HandleClient(TcpClient tcpClient)
{
    // ....
    RequestContent?.Invoke(request);
    // ....
}

Question

1. How to transfer data from the third-level class (the HttpProcessor.cs class) to the first-level class (the WinForm class)?

2. How are there other solutions to replace using the public event Action RequestContent;?