Question

I’m pretty new to programming, so bear with me if my question isn’t specific enough. Right now I’m trying to make a simple Client Logon to my server. So the server App knows which users are connected. When a client connects I want an event to fire on the server that update the userlist. But it doesn’t and I can’t figure out why. Hope you can help.

In the codes I have removed how the users should be displayed in the serverApp. Right now I just need the event to work.

In my Service Library:

INetworkService contract:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace NetworkLib
{
    [ServiceContract]
    public interface INetworkService
    {
        [OperationContract]
        void Logon(UserInfo userInfo);

        [OperationContract]
        void Logout();
    }
}

NetworkService Class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;

namespace NetworkLib
{
    public class NetworkService : INetworkService
    {
        public event EventHandler UserListChanged;

        public void Logon(UserInfo userInfo)
        {
            OnUserListChanged();
        }

        public void Logout()
        {
            OnUserListChanged();
        }

        private void OnUserListChanged()
        {
            var handler = UserListChanged;
            if (handler != null)
            {
                handler(this, EventArgs.Empty);
            }
        }
    }
}

UserInfo Class:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.Serialization;

namespace NetworkLib
{
    [DataContract]
    public class UserInfo
    {
        [DataMember]
        public string Name;
    }
}

In my ServerApp (WPF):

using System.ServiceModel;
using NetworkLib;

namespace ServerApp
{
    public partial class MainWindow : Window
    {

        NetworkService networkService;

        public MainWindow()
        {
            InitializeComponent();

            ServiceHost host = new ServiceHost(typeof(NetworkService));

            host.Open();

            networkService = new NetworkService();

            networkService.UserListChanged += networkService_UserListChanged;

        }

        private void networkService_UserListChanged(object sender, EventArgs e)
        {
            MessageBox.Show("It Works!");
        }
    }
}

In my ClientApp (WPF): (Have made a Service Reference to the Server)

namespace ClientApp
{

    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {
            ServiceReference.NetworkServiceClient proxy = new ServiceReference.NetworkServiceClient();

            ServiceReference.UserInfo userInfo = new ServiceReference.UserInfo();

            userInfo.Name = "Test";

            proxy.Logon(userInfo);

        }
    }
}

Answer 1

When creating your ServiceHost, you should provide NetworkService instance instead of typeof(NetworkService)

ServiceHost host = new ServiceHost(networkService);

You need to initialize it first, of course.