Error in a thread containing an infinite loop, how to solve?

A

Alexj0k2016-02-21 20:38:36

C++ / C#

Alexj0k, 2016-02-21 20:38:36

Hello, I can not figure out what the problem is, how can I solve this situation? An exception appears when connecting through a browser to this, so to speak, server.
Description of the exception:

Unhandled exception of type 'System.InvalidOperationException' in System.dll
Additional information: This operation could not be performed after the response was sent.

stack trace:

at System.Net.HttpListenerResponse.set_ContentLength64(Int64 value)
at WEB_Server.ChildThread.Connections(Boolean isListening, HttpListenerContext context) at E:\Visual Studio\Projects\WEB-Server\WEB-Server\Source Code\ChildThread.cs:string 38
in WEB_Server.Program.<>c.b__9_0() in E:\Visual Studio\Projects\WEB-Server\WEB-Server\Source Code\Program.cs:line 59
in System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext , ContextCallback callback, Object state, Boolean preserveSyncCtx)
to System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
to System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
at System.Threading.ThreadHelper.ThreadStart()

The creation of a separate thread is implemented in the following way:

_t = new Thread(()=> ChildThread.Connections(_server.IsListening, _server.GetContext()));
            _t.Start();

The class containing the cycle:

using System.Net;
using System.Text;

namespace WEB_Server
{
    internal class ChildThread : Program
    {
        internal static void Connections(bool isListening, HttpListenerContext context)
        {
            while (isListening)
            {
                if (!Flag)
                {
                    SwitchOff_Server();
                    break;
                }

                var request = context.Request;

                if (request.HttpMethod == "POST")
                {
                    FileIO.logHandler(request);
                    ShowRequestData(request);
                    if (!Flag) return;
                }

                const string responseString = @"<!DOCTYPE HTML>
                    <html><head></head><body>
                    <form method=""post"" action=""say"">
                    <p><b>Name: </b><br>
                    <input type=""text"" name=""myname"" size=""40""></p>
                    <p><input type=""submit"" value=""send""></p>
                    </form></body></html>";

                var response = context.Response;
                response.ContentType = "text/html; charset=UTF-8";
                var buffer = Encoding.UTF8.GetBytes(responseString);
                response.ContentLength64 = buffer.Length; // <=== в этом месте проявляется исключение при подключении через браузер

                using (var output = response.OutputStream)
                {
                    output.Write(buffer, 0, buffer.Length);
                }
            }
        }
    }
}

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1 answer(s)

A

Alexander Ananiev, 2016-02-22
@SaNNy32

Well, according to the ContentLength description , an InvalidOperationException occurs when "The response is already being sent." Those. when the data has already been sent, the ContentLength property cannot be set.