Procedura: implementare un'applicazione client che usa il proxy di individuazione per cercare un servizioHow to: Implement a Client Application that Uses the Discovery Proxy to Find a Service

Quello che segue è il terzo di tre argomenti incentrato sull'implementazione di un proxy di individuazione.This topic is the third of three topics that discusses how to implement a discovery proxy. Nella sezione precedente procedura: implementare un servizio individuabile che esegue la registrazione al Proxy di individuazione, è implementato un servizio WCF che effettua la registrazione con il proxy di individuazione.In the previous topic, How to: Implement a Discoverable Service that Registers with the Discovery Proxy, you implemented a WCF service that registers itself with the discovery proxy. In questo argomento è creare un client WCF che usa il proxy di individuazione per trovare il servizio WCF.In this topic you create a WCF client that uses the discovery proxy to find the WCF service.

Implementare il clientImplement the client

  1. Aggiungere un nuovo progetto applicazione console denominato DiscoveryProxyExample alla soluzione Client.Add a new console application project to the DiscoveryProxyExample solution called Client.

  2. Aggiungere riferimenti agli assembly riportati di seguito:Add references to the following assemblies:

    1. System.ServiceModelSystem.ServiceModel

    2. System.ServiceModel.DiscoverySystem.ServiceModel.Discovery

  3. Aggiungere al progetto il file GeneratedClient.cs individuato nella parte inferiore di questo argomento.Add the GeneratedClient.cs found at the bottom of this topic to the project.

    Nota

    In genere, questo file viene generato utilizzando uno strumento come Svcutil.exe,This file is usually generated using a tool such as Svcutil.exe. fornito nel presente argomento per semplificare l'attività.It is provided in this topic to simplify the task.

  4. Aprire il file Program.cs e aggiungere il metodo seguente.Open the Program.cs file and add the following method. Questo metodo prende un indirizzo endpoint e lo utilizza per inizializzare il client del servizio (proxy).This method takes an endpoint address and uses it to initialize the service client (proxy).

    static void InvokeCalculatorService(EndpointAddress endpointAddress)  
            {  
                // Create a client  
                CalculatorServiceClient client = new CalculatorServiceClient(new NetTcpBinding(), endpointAddress);  
                Console.WriteLine("Invoking CalculatorService at {0}", endpointAddress.Uri);  
                Console.WriteLine();  
    
                double value1 = 100.00D;  
                double value2 = 15.99D;  
    
                // Call the Add service operation.  
                double result = client.Add(value1, value2);  
                Console.WriteLine("Add({0},{1}) = {2}", value1, value2, result);  
    
                // Call the Subtract service operation.  
                result = client.Subtract(value1, value2);  
                Console.WriteLine("Subtract({0},{1}) = {2}", value1, value2, result);  
    
                // Call the Multiply service operation.  
                result = client.Multiply(value1, value2);  
                Console.WriteLine("Multiply({0},{1}) = {2}", value1, value2, result);  
    
                // Call the Divide service operation.  
                result = client.Divide(value1, value2);  
                Console.WriteLine("Divide({0},{1}) = {2}", value1, value2, result);  
                Console.WriteLine();  
    
                // Closing the client gracefully closes the connection and cleans up resources  
                client.Close();  
            }  
    
  5. Aggiungere al metodo Main il seguente codice.Add the following code to the Main method.

    public static void Main()  
            {  
                // Create a DiscoveryEndpoint that points to the DiscoveryProxy  
                Uri probeEndpointAddress = new Uri("net.tcp://localhost:8001/Probe");  
                DiscoveryEndpoint discoveryEndpoint = new DiscoveryEndpoint(new NetTcpBinding(), new EndpointAddress(probeEndpointAddress));  
    
                // Create a DiscoveryClient passing in the discovery endpoint  
                DiscoveryClient discoveryClient = new DiscoveryClient(discoveryEndpoint);  
    
                Console.WriteLine("Finding ICalculatorService endpoints using the proxy at {0}", probeEndpointAddress);  
                Console.WriteLine();  
    
                try  
                {  
                    // Search for services that implement ICalculatorService              
                    FindResponse findResponse = discoveryClient.Find(new FindCriteria(typeof(ICalculatorService)));  
    
                    Console.WriteLine("Found {0} ICalculatorService endpoint(s).", findResponse.Endpoints.Count);  
                    Console.WriteLine();  
    
                    // Check to see if endpoints were found, if so then invoke the service.  
                    if (findResponse.Endpoints.Count > 0)  
                    {  
                        InvokeCalculatorService(findResponse.Endpoints[0].Address);  
                    }  
                }  
                catch (TargetInvocationException)  
                {  
                    Console.WriteLine("This client was unable to connect to and query the proxy. Ensure that the proxy is up and running.");  
                }  
    
                Console.WriteLine("Press <ENTER> to exit.");  
                Console.ReadLine();  
            }  
    

L'implementazione dell'applicazione client è stata completata.You have completed implementing the client application. Continuare a procedura: testare il Proxy di individuazione.Continue on to How to: Test the Discovery Proxy.

EsempioExample

Di seguito è riportato il codice completo per questo argomento.This is the full code listing for this topic.

// GeneratedClient.cs  
//----------------------------------------------------------------  
// Copyright (c) Microsoft Corporation.  All rights reserved.  
//----------------------------------------------------------------  
//------------------------------------------------------------------------------  
// <auto-generated>  
//     This code was generated by a tool.  
//     Runtime Version:2.0.50727.1434  
//  
//     Changes to this file may cause incorrect behavior and will be lost if  
//     the code is regenerated.  
// </auto-generated>  
//------------------------------------------------------------------------------  

namespace Microsoft.Samples.Discovery  
{  
    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]  
    [System.ServiceModel.ServiceContractAttribute(Namespace = "http://Microsoft.Samples.Discovery", ConfigurationName = "ICalculatorService")]  
    public interface ICalculatorService  
    {  

        [System.ServiceModel.OperationContractAttribute(ProtectionLevel = System.Net.Security.ProtectionLevel.EncryptAndSign, Action = "http://Microsoft.Samples.Discovery/ICalculatorService/Add", ReplyAction = "http://Microsoft.Samples.Discovery/ICalculatorService/AddResponse")]  
        double Add(double n1, double n2);  

        [System.ServiceModel.OperationContractAttribute(ProtectionLevel = System.Net.Security.ProtectionLevel.EncryptAndSign, Action = "http://Microsoft.Samples.Discovery/ICalculatorService/Subtract", ReplyAction = "http://Microsoft.Samples.Discovery/ICalculatorService/SubtractResponse")]  
        double Subtract(double n1, double n2);  

        [System.ServiceModel.OperationContractAttribute(ProtectionLevel = System.Net.Security.ProtectionLevel.EncryptAndSign, Action = "http://Microsoft.Samples.Discovery/ICalculatorService/Multiply", ReplyAction = "http://Microsoft.Samples.Discovery/ICalculatorService/MultiplyResponse")]  
        double Multiply(double n1, double n2);  

        [System.ServiceModel.OperationContractAttribute(ProtectionLevel = System.Net.Security.ProtectionLevel.EncryptAndSign, Action = "http://Microsoft.Samples.Discovery/ICalculatorService/Divide", ReplyAction = "http://Microsoft.Samples.Discovery/ICalculatorService/DivideResponse")]  
        double Divide(double n1, double n2);  
    }  

    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]  
    public interface ICalculatorServiceChannel : ICalculatorService, System.ServiceModel.IClientChannel  
    {  
    }  

    [System.Diagnostics.DebuggerStepThroughAttribute()]  
    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "4.0.0.0")]  
    public partial class CalculatorServiceClient : System.ServiceModel.ClientBase<ICalculatorService>, ICalculatorService  
    {  

        public CalculatorServiceClient()  
        {  
        }  

        public CalculatorServiceClient(string endpointConfigurationName) :  
            base(endpointConfigurationName)  
        {  
        }  

        public CalculatorServiceClient(string endpointConfigurationName, string remoteAddress) :  
            base(endpointConfigurationName, remoteAddress)  
        {  
        }  

        public CalculatorServiceClient(string endpointConfigurationName, System.ServiceModel.EndpointAddress remoteAddress) :  
            base(endpointConfigurationName, remoteAddress)  
        {  
        }  

        public CalculatorServiceClient(System.ServiceModel.Channels.Binding binding, System.ServiceModel.EndpointAddress remoteAddress) :  
            base(binding, remoteAddress)  
        {  
        }  

        public double Add(double n1, double n2)  
        {  
            return base.Channel.Add(n1, n2);  
        }  

        public double Subtract(double n1, double n2)  
        {  
            return base.Channel.Subtract(n1, n2);  
        }  

        public double Multiply(double n1, double n2)  
        {  
            return base.Channel.Multiply(n1, n2);  
        }  

        public double Divide(double n1, double n2)  
        {  
            return base.Channel.Divide(n1, n2);  
        }  
    }  
}  
// Program.cs  
//----------------------------------------------------------------  
// Copyright (c) Microsoft Corporation.  All rights reserved.  
//----------------------------------------------------------------  

using System;  
using System.Reflection;  
using System.ServiceModel;  
using System.ServiceModel.Discovery;  

namespace Microsoft.Samples.Discovery  
{  
    class Client  
    {  
        public static void Main()  
        {  
            // Create a DiscoveryEndpoint that points to the DiscoveryProxy  
            Uri probeEndpointAddress = new Uri("net.tcp://localhost:8001/Probe");  
            DiscoveryEndpoint discoveryEndpoint = new DiscoveryEndpoint(new NetTcpBinding(), new EndpointAddress(probeEndpointAddress));  

            DiscoveryClient discoveryClient = new DiscoveryClient(discoveryEndpoint);  

            Console.WriteLine("Finding ICalculatorService endpoints using the proxy at {0}", probeEndpointAddress);  
            Console.WriteLine();  

            try  
            {  
                // Find ICalculatorService endpoints              
                FindResponse findResponse = discoveryClient.Find(new FindCriteria(typeof(ICalculatorService)));  

                Console.WriteLine("Found {0} ICalculatorService endpoint(s).", findResponse.Endpoints.Count);  
                Console.WriteLine();  

                // Check to see if endpoints were found, if so then invoke the service.  
                if (findResponse.Endpoints.Count > 0)  
                {  
                    InvokeCalculatorService(findResponse.Endpoints[0].Address);  
                }  
            }  
            catch (TargetInvocationException)  
            {  
                Console.WriteLine("This client was unable to connect to and query the proxy. Ensure that the proxy is up and running.");  
            }  

            Console.WriteLine("Press <ENTER> to exit.");  
            Console.ReadLine();  
        }  

        static void InvokeCalculatorService(EndpointAddress endpointAddress)  
        {  
            // Create a client  
            CalculatorServiceClient client = new CalculatorServiceClient(new NetTcpBinding(), endpointAddress);  
            Console.WriteLine("Invoking CalculatorService at {0}", endpointAddress.Uri);  
            Console.WriteLine();  

            double value1 = 100.00D;  
            double value2 = 15.99D;  

            // Call the Add service operation.  
            double result = client.Add(value1, value2);  
            Console.WriteLine("Add({0},{1}) = {2}", value1, value2, result);  

            // Call the Subtract service operation.  
            result = client.Subtract(value1, value2);  
            Console.WriteLine("Subtract({0},{1}) = {2}", value1, value2, result);  

            // Call the Multiply service operation.  
            result = client.Multiply(value1, value2);  
            Console.WriteLine("Multiply({0},{1}) = {2}", value1, value2, result);  

            // Call the Divide service operation.  
            result = client.Divide(value1, value2);  
            Console.WriteLine("Divide({0},{1}) = {2}", value1, value2, result);  
            Console.WriteLine();  

            // Closing the client gracefully closes the connection and cleans up resources  
            client.Close();  
        }  
    }  
}  

Vedere ancheSee Also

Panoramica di WCF DiscoveryWCF Discovery Overview
Procedura: Implementare un proxy di individuazioneHow to: Implement a Discovery Proxy
Procedura: Implementare un servizio individuabile che esegue la registrazione al proxy di individuazioneHow to: Implement a Discoverable Service that Registers with the Discovery Proxy