Generated self-contained executable file failed to run after I close Visual Studio

Question

I came across a problem when I run my generated self-contained executable file. The .exe file runs fine when I have Visual Studio open. However, it fails once I close Visual Studio. I think this is because my WCF service is not self-hosted, but how to do it? Can anyone tell me?

Results when I have Visual Studio open:

Uploading...
1
2
Upload Finished!

Result when I closed visual studio:

Uploading...
1

Unhandled Exception: System.AggregateException: One or more errors occurred. (No connection could be made because the target machine actively refused it) ---> System.ServiceModel.CommunicationException: No connection could be made because the target machine actively refused it ---> System.Net.Http.HttpRequestException: No connection could be made because the target machine actively refused it ---> System.Net.Sockets.SocketException: No connection could be made because the target machine actively refused it

at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
--- End of inner exception stack trace ---
at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
at System.Threading.Tasks.ValueTask 1.get_Result()
at System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Threading.Tasks.ValueTask 1.get_Result()
at System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Threading.Tasks.ValueTask 1.get_Result()
at System.Net.Http.HttpConnectionPool.CreateConnectionAsync(HttpRequestMessage request, CancellationToken cancellationToken)
at System.Threading.Tasks.ValueTask 1.get_Result()
at System.Net.Http.HttpConnectionPool.WaitForCreatedConnectionAsync(ValueTask 1 creationTask) at System.Threading.Tasks.ValueTask 1.get_Result() at System.Net.Http.HttpConnectionPool.SendWithRetryAsync(HttpRequestMessage request, Boolean doRequestAuth, CancellationToken cancellationToken) at System.Net.Http.AuthenticationHelper.SendWithAuthAsync(HttpRequestMessage request, Uri authUri, ICredentials credentials, Boolean preAuthenticate, Boolean isProxyAuth, Boolean doRequestAuth, HttpConnectionPool pool, CancellationToken cancellationToken) at System.Net.Http.RedirectHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) at System.Net.Http.DecompressionHandler.SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) at System.Net.Http.HttpClient.FinishSendAsyncUnbuffered(Task 1 sendTask, HttpRequestMessage request, CancellationTokenSource cts, Boolean disposeCts) at System.ServiceModel.Channels.HttpChannelFactory 1.HttpClientRequestChannel.H ttpClientChannelAsyncRequest.SendRequestAsync(Message message, TimeoutHelper timeoutHelper) --- End of inner exception stack trace --- at System.Runtime.AsyncResult.End[TAsyncResult](IAsyncResult result) at System.ServiceModel.Channels.ServiceChannel.SendAsyncResult.End(SendAsyncResult result) at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result) at System.ServiceModel.Channels.ServiceChannelProxy.TaskCreator.<>c__DisplayClass2_0.b__0(IAsyncResult asyncResult) --- End of inner exception stack trace --- at System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken) at System.Threading.Tasks.Task.Wait() at sharepoint.Program.Main() in C:\\Temp\\tmp\\fire\\SFFD\\sharepoint\\WebService\\sharepoint\\Program.cs:line 16

Here is my code:

using ServiceReference1;
using System;
using System.Threading.Tasks;
using System.ServiceModel;

    namespace sharepoint
    {
        class Program
        {
            static void Main()
            {

                using (ServiceHost host = new ServiceHost(typeof(WCFService2.Service)))
                {
                    host.open();
                    Console.WriteLine("Uploading...");
                    //ServiceReference1.ServiceClient ws = new ServiceReference1.ServiceClient();
                    ServiceClient client = new ServiceClient();
                    Console.WriteLine("1");
                    Task.Run(() => client.start_processAsync()).Wait();
                    Console.WriteLine("2");
                    Console.WriteLine("Upload Finished!");
                    Console.ReadLine();
                }
            }
        }
    }

For some reason, ServiceHost is not recognized.

Answer 1

Yes, buddy. We need to host the service before consuming it. The ServiceClient is the instance of the client proxy class. It is auto-generated by adding service reference.
https://docs.microsoft.com/en-us/dotnet/framework/wcf/accessing-services-using-a-wcf-client
In you project, the server and the client is on the same machine. We could separate the client-side into an individual project, generate the client proxy class by adding service reference.
On the server-side, you could refer to the below code. It also is self-hosted.

using (ServiceHost sh = new ServiceHost(typeof(MyService)))
            {
                sh.Open();
                Console.WriteLine("Service is ready....");

                Console.ReadLine();
                sh.Close();
            }

Before consuming the WCF service, we should start the server project at first.
Feel free to let me know if there is anything I can help with.