Question

So I’ve been posting this week for help with an API that has asynchronous calls. You can view the CODE here: C# asynchronous event procedure does not fire

With a little more digging, I found out that the API is written in VB.NET and I created a VB.NET example and guess what . . . the asynchronous calls work like a charm.

So, now I need to find out why the calls are not firing in the C# code I have. The API being written in VB really shouldn’t matter, but again, the VB.NET code works and my C# does not. Is there a problem with the event handler and hows its being declared that causes it to not fire?

UPDATE VB Code added

Imports ClientSocketServices
Imports DHS_Commands
Imports DHS
Imports Utility
Imports SocketServices

Class Window1

    Public WithEvents AppServer As New ClientAppServer
    Public Token As LoginToken

    Private Sub login()

        Dim handler As New LoginHandler
        Token = handler.RequestLogin("admin", "admin", localPort:=12000, serverAddress:="127.0.0.1", serverLoginPort:=11000, clienttype:=LoginToken.eClientType.Client_Admin, timeoutInSeconds:=20)

        If Token.Authenticated Then
            AppServer = New ClientAppServer(Token, True)
            AppServer.RetrieveCollection(GetType(Gateways))
        End If

    End Sub

    Private Sub ReceiveMessage(ByVal rr As RemoteRequest) Handles AppServer.ReceiveRequest

        If TypeOf (rr.TransferObject) Is Gateways Then
            MsgBox("dd")
        End If

    End Sub

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.Windows.RoutedEventArgs) Handles Button1.Click
        login()
    End Sub
End Class

Answer 1

You’re VB code is quite different from your c# code.
Try converting your vb code to c#, but keep in mind that you don’t get WithEvents, so any time you
   AppServer = New ClientAppServer(Token, True);
you will need to
   AppServer.ReceiveRequest += ReceiveMessage;

EDIT: I converted your code using http://www.developerfusion.com/tools/convert/vb-to-csharp/ I also editted it by hand to make the events work. Keep in mind that I haven’t tested this; I apologize for any typos/etc.

I’m also wondering, is your button click actually happening? Where is the event handler added check that it actually is in your IntializeComponent?

using DHS;
using Utility;
using SocketServices;

class Window1
{
    
    public ClientAppServer AppServer = new ClientAppServer();
    public LoginToken Token;
    

    public Window1()
    {
      InitializeComponent();
    }

    private void login()
    {
        
        LoginHandler handler = new LoginHandler();
        Token = handler.RequestLogin("admin", "admin", localPort = 12000, serverAddress = "127.0.0.1", serverLoginPort = 11000, clienttype = LoginToken.eClientType.Client_Admin, timeoutInSeconds = 20);
        
        if (Token.Authenticated) {
            AppServer = new ClientAppServer(Token, true);
            AppServer.ReceiveRequest += ReceiveMessage;
            AppServer.RetrieveCollection(typeof(Gateways));
            
        }
    }
    
    private void ReceiveMessage(RemoteRequest rr)
    {
        
        if ((rr.TransferObject) is Gateways) {
            MessageBox.Show("dd");
            
        }
    }
    
    private void Button1_Click(System.Object sender, System.Windows.RoutedEventArgs e)
    {
        login();
    }
}