带有回调的WS-发现

如何解决带有回调的WS-发现

我正在尝试通过回调功能实现ws-discovery，以便在局域网上发现我的IP摄像机

• 从

  生成的作为ServiceReference1的连接服务

  http://schemas.xmlsoap.org/ws/2005/04/discovery/ws-discovery.wsdl

我从来没有使用过带有双工绑定的服务，因此在网络上没有那么多东西，因此大部分代码是通过收集来自各个地方的难题来完成的。 这是代码：

           WSDualHttpBinding binding = new WSDualHttpBinding();
           binding.ClientBaseAddress = new Uri("http://localhost:8000/wsDicOct2020/Client");
          
           // var endPoint = new UdpDiscoveryEndpoint(DiscoveryVersion.WSDiscoveryApril2005);
           EndpointAddress endptadr = new EndpointAddress("http://239.255.255.250:3702");
           
           InstanceContext instanceContext = new InstanceContext(new CallbackHandler());
      
           TargetServiceClient targetServiceClient = new TargetServiceClient(instanceContext,binding,endptadr);
           ProbeType probeType = new ProbeType();
           probeType.Types = "NetworkVideoTransmitter";
           ScopesType scopesType = new ScopesType();
           scopesType.MatchBy = "http://www.onvif.org/ver10/network/wsdl";
           probeType.Scopes = scopesType;

           XmlElement[] xmlElementsAny = new XmlElement[10];
           XmlAttribute[] xmlElementsAnyAttr = new XmlAttribute[10];
           probeType.Any = xmlElementsAny;
           probeType.AnyAttr = xmlElementsAnyAttr;
         
           targetServiceClient.ProbeOp(probeType);
     

这是回调函数：

     ```
    public class CallbackHandler : ServiceReference1.TargetServiceCallback
    {
        public void ByeOp(ByeOp request)
        {
            throw new NotImplementedException();
        }


        public void HelloOp(HelloOp request)
        {
            throw new NotImplementedException();
        }

        public void ProbeMatchOp(ProbeMatchOp request)
        {
            throw new NotImplementedException();
        }

        public void ResolveMatchOp(ResolveMatchOp request)
        {
            throw new NotImplementedException();
        }
    }

I also did:

    netsh http add urlacl url=http://localhost:8000/wsDicOct2020/Client user=everyone

and started VisualStudio as administrator
When executing,I get the error:

**System.ServiceModel.EndpointNotFoundException: 'There was no endpoint listening at http://239.255.255.250:3702/** 

WHAT IS WRONG WITH THE CODE ABOVE?

I cannot find any sample with ws-discovery service. Is it possible to do it in this way

But,when using the sample code from:

https://stackoverflow.com/questions/13416193/how-to-discover-onvif-devices-in-c-sharp/13424887#13424887

everything works well and I see in wireshark that the following message was sent to 

239.255.255.250:3702

<s:Envelope xmlns:s="http://www.w3.org/2003/05/soap-envelope" xmlns:a="http://schemas.xmlsoap.org/ws/2004/08/addressing">
<s:Header>
<a:Action s:mustUnderstand="1">http://schemas.xmlsoap.org/ws/2005/04/discovery/Probe
</a:Action>
<a:MessageID>
urn:uuid:d191615b-37e7-49fe-bd90-0c4ea00be56a
</a:MessageID>
<a:ReplyTo>
<a:Address>
http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous
</a:Address>
</a:ReplyTo>
<a:To s:mustUnderstand="1">urn:schemas-xmlsoap-org:ws:2005:04:discovery
</a:To>
<ActivityId CorrelationId="8baaa049-f6a3-49fc-aa70-f0481abf23fa" xmlns="http://schemas.microsoft.com/2004/09/ServiceModel/Diagnostics">00000000-0000-0000-0000-000000000000
</ActivityId>
<VsDebuggerCausalityData xmlns="http://schemas.microsoft.com/vstudio/diagnostics/servicemodelsink">uIDPo/ars9V0Ok9Kt+U4hUOepSQAAAAAZqAS01r3gE2M3Eke3NbCnebPQ6pfzN9HooOqOfILEP0ACQAA
</VsDebuggerCausalityData>
</s:Header>
<s:Body>
<Probe xmlns="http://schemas.xmlsoap.org/ws/2005/04/discovery">
<d:Types xmlns:d="http://schemas.xmlsoap.org/ws/2005/04/discovery" xmlns:dp0="http://www.onvif.org/ver10/network/wsdl">
dp0:NetworkVideoTransmitter
</d:Types>
</Probe>
</s:Body>
</s:Envelope>

In my opinion using callback function will be an elegant way to get noticed about a new device or when a device leaves the LAN.
Thanks in advance