[RESOLVED] Checking for an error before it happens [TcpListener]

Basically, in my Tcp Library I'm working on, whenever the system is told to "Stop", the OnClientConnected() Routine fires off, which is only raised under two circumstances:

1. When a Client connects (obviously)
2. When the server is told to shutdown

Now, the first one is handled just fine. But the second one is not. In fact, it has caused me a great deal of headache because it keeps throwing exceptions on this line in particular:

Code:

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Dim _tcpClient As System.Net.Sockets.TcpClient = _tcpListener.EndAcceptTcpClient(IR)

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When I hover over while debugging, I can see a few members that reveal exception data I could utilize; but unfortunately those members are private and I don't want to utilize reflection unless I have to since it could slow down performance where there may not be a real reason to.

I have thought of writing in a Boolean check to see if the server received a shutdown signal and that would indicate that it's time to not accept anything, but I want to avoid that if possible.

Is there any way to see if the TcpListener is no longer accepting connections and has had .Stop() called without reverting to catching the ObjectDisposedException that is raised? (because the Socket that is "accepted" is actually a disposed one)

The Active property is a protected member of the TcpListener class, and it gets set to false once Stop() is called. All you have to do is just inherit the TcpListener:

Code:

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Public Class TcpListenerEx
    Inherits TcpListener

    '//properties
    Public Shadows ReadOnly Property Active() As Boolean
        Get
            Return MyBase.Active
        End Get
    End Property

    '//constructors
    Public Sub New(ByVal localEP As IPEndPoint)
        MyBase.New(localEP)
    End Sub

    Public Sub New(ByVal localaddr As IPAddress, _
                  ByVal port As Integer)
        MyBase.New(localaddr, port)
    End Sub

End Class

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Quote:

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Originally Posted by ForumAccount

The Active property is a protected member of the TcpListener class, and it gets set to false once Stop() is called. All you have to do is just inherit the TcpListener:

Code:

---

Public Class TcpListenerEx
    Inherits TcpListener

    '//properties
    Public Shadows ReadOnly Property Active() As Boolean
        Get
            Return MyBase.Active
        End Get
    End Property

    '//constructors
    Public Sub New(ByVal localEP As IPEndPoint)
        MyBase.New(localEP)
    End Sub

    Public Sub New(ByVal localaddr As IPAddress, _
                  ByVal port As Integer)
        MyBase.New(localaddr, port)
    End Sub

End Class

---

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Two things I have to note:

1) When quoting your message, I am surrounded by a bunch of BBC code.
2) I thought about Inheritance, but now I'll have to rewrite everything to inherit off of this new one. I'll finagle around with it and see what happens.

EDIT: No I won't. But this will make things really easy actually. Let's see if this works!

@ #1 - Yeah I colorize my code. It's a personal OCD preference (has to match my IDE).

It works, thanks ForumAccount!