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How to:Determine the Discovery Version of a Probe Request

A discovery proxy may expose multiple discovery endpoints using different discovery versions. When a UDP multicast Probe request arrives at the proxy the proxy should respond with a multicast suppression message. In order to do this it would have to know the discovery version of the request.

To Determine the Discovery Version of a Probe Request

  • In the method that responds to a Probe request (for example OnBeginFind) use the static Current property to search for a DiscoveryOperationContextExtension as shown in the following code.

    DiscoveryOperationContextExtension doce = OperationContext.Current.Extensions.Find<DiscoveryOperationContextExtension>();
    // Access the discovery version from the DiscoveryOperationContextExtension
    doce.DiscoveryVersion;
    
    
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