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Editorial Team
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Asked: 2026-05-25T17:58:03+00:00

I would like to add callbacks to my WCF service, so that my client

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I would like to add callbacks to my WCF service, so that
my client can receive notifications of certain server events.
I found a beginner’s guide to callbacks: http://idunno.org/archive/2008/05/29/wcf-callbacks-a-beginners-guide.aspx, but this seems to only apply to HTTP binding.

Any ideas?

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1 Answer

  1. Editorial Team

    Actually, it doesn’t apply to a regular HTTP binding (which is one-way), only wsDualHttpBinding, which is a special binding not typically supported on platforms other than .NET. Using callbacks with NetTCP is as easy as changing 

    <endpoint address ="" binding="wsDualHttpBinding" contract="WCFCallbacks.IMessage">

    to

    <endpoint address ="" binding="netTcpBinding" contract="WCFCallbacks.IMessage">

    and 

    <baseAddresses>
    <add baseAddress = "http://localhost:8731/Design_Time_Addresses/WCFCallbacks/Message/" />
</baseAddresses>

    to

    <baseAddresses>
    <add baseAddress = "net.tcp://localhost:8731/Design_Time_Addresses/WCFCallbacks/Message/" />
</baseAddresses>

    Just make sure whatever port you use isn’t already bound to by another process on your system, such as IIS (unless you plan to host your service inside IIS).

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