Cómo: Implementar una aplicación cliente que utiliza el proxy de detección para buscar un servicio
Este tema es el tercero de tres temas y describe cómo implementar un proxy de detección. En el tema anterior, Cómo: Implementar un servicio reconocible que se registra con el proxy de detección, implementó un servicio de WCF que se registra con el proxy de detección. En este tema, creará un cliente de WCF que usará el proxy de detección para encontrar el servicio de WCF.
Implementar el cliente
Agregue un nuevo proyecto de aplicación de consola a la solución
DiscoveryProxyExampledenominadaClient.Agregue referencias a los ensamblados siguientes:
System.ServiceModel
System.ServiceModel.Discovery
Agregue al proyecto GeneratedClient.cs, que se encuentra en la parte inferior de este tema.
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Nota:Este archivo se suele generar mediante una herramienta como Svcutil.exe. Dicha herramienta se proporciona en este tema para simplificar la tarea. Abra el archivo Program.cs y agregue el siguiente método. Este método toma una dirección del extremo y lo utiliza para inicializar el cliente del servicio (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(); }Agregue el código siguiente al método
Main.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(); }
Ha completado la implementación de la aplicación cliente. Continúe en Cómo: Probar el proxy de detección.
Ejemplo
Esta es la lista de códigos completa de este tema.
// 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();
}
}
}
Vea también
Tareas
Cómo: Implementar un proxy de detección
Cómo: Implementar un servicio reconocible que se registra con el proxy de detección