http://www.cnblogs.com/yiyisawa/archive/2008/12/16/1356191.html

问题： 假设有一个大型系统新版本使用wcf 作为服务端，生成wcf client 调用可以调用正常。 那如果当wcf 服务端出现问题或其他的原因我想再用回以前老版本的webservice或是jms server ，但客户端调用还是通过wcf client 调用。只通过更改配置来实现。

 一、web service项目，添加一个普通service class .代码如下：

Code
[WebService(Namespace="http://Microsoft.ServiceModel.Samples")]
    public class CalculatorService : System.Web.Services.WebService
    {        
        [WebMethod]
        public double Add(double n1, double n2)
        {
            return n1 + n2;
        }
        [WebMethod]
        public double Subtract(double n1, double n2)
        {
            return n1 - n2;
        }
        [WebMethod]
        public double Multiply(double n1, double n2)
        {
            return n1 * n2;
        }
        [WebMethod]
        public double Divide(double n1, double n2)
        {
            return n1 / n2;
        }
    } 

webservice配置文件无需更改。运行。记录服务地址。

二、打开路径C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin：找到svcutil.exe文件。开始菜单-->run --> input cmd --->cd C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin -->回车;

输入svcutil http://localhost:8080/service/service.asmx,将会在C:\Program Files\Microsoft SDKs\Windows\v6.0A\bin生成一个webservice的代理类。注意：此代理类是wcf client形式的。（在后面只需将这个代理类小作改动，便可用于wcf sevice.）

生成的代理类：

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated by a tool.
//     Runtime Version:2.0.50727.3053
//
//     Changes to this file may cause incorrect behavior and will be lost if
//     the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------



    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")]
    [System.ServiceModel.ServiceContractAttribute(Namespace = "http://Microsoft.ServiceModel.Samples", ConfigurationName = "CalculatorServiceSoap")]
    public interface CalculatorServiceSoap
    {

        [System.ServiceModel.OperationContractAttribute(Action = "http://Microsoft.ServiceModel.Samples/Add", ReplyAction = "*")]
        double Add(double n1, double n2);

        [System.ServiceModel.OperationContractAttribute(Action = "http://Microsoft.ServiceModel.Samples/Subtract", ReplyAction = "*")]
        double Subtract(double n1, double n2);

        [System.ServiceModel.OperationContractAttribute(Action = "http://Microsoft.ServiceModel.Samples/Multiply", ReplyAction = "*")]
        double Multiply(double n1, double n2);

        [System.ServiceModel.OperationContractAttribute(Action = "http://Microsoft.ServiceModel.Samples/Divide", ReplyAction = "*")]
        double Divide(double n1, double n2);
    }

    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")]
    public interface CalculatorServiceSoapChannel : CalculatorServiceSoap, System.ServiceModel.IClientChannel
    {
    }

    [System.Diagnostics.DebuggerStepThroughAttribute()]
    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.ServiceModel", "3.0.0.0")]
    public partial class CalculatorServiceSoapClient : System.ServiceModel.ClientBase<CalculatorServiceSoap>, CalculatorServiceSoap
    {

        public CalculatorServiceSoapClient()
        {
        }

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

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

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

        public CalculatorServiceSoapClient(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);
        }
    }

三、添加Console Application,将上面生成的代理类加入项目中，并在Main方法中调用。

 Service1Clients client = new Service1Clients();

           //   Service1Client client = new Service1Client();
            // Call the Add service operation.
            double value1 = 100.00D;
            double value2 = 15.99D;
            
            
            
            
            double result = client.Add(value1, value2);
            Console.WriteLine("Add({0},{1}) = {2}", value1, value2, result);

            // Call the Subtract service operation.
            value1 = 145.00D;
            value2 = 76.54D;
            result = client.Subtract(value1, value2);
            Console.WriteLine("Subtract({0},{1}) = {2}", value1, value2, result);

            // Call the Multiply service operation.
            value1 = 9.00D;
            value2 = 81.25D;
            result = client.Multiply(value1, value2);
            Console.WriteLine("Multiply({0},{1}) = {2}", value1, value2, result);

            // Call the Divide service operation.
            value1 = 22.00D;
            value2 = 7.00D;
            result = client.Divide(value1, value2);
            Console.WriteLine("Divide({0},{1}) = {2}", value1, value2, result);

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

            Console.WriteLine();
            Console.WriteLine("Press <ENTER> to terminate client.");
            Console.ReadLine();

添加配置文件：App.config.此配置文件在二步生成代理类的时候会有Out.config同时产生。config里面的内容拷过来即可。

<system.serviceModel>
    
     <bindings>
      <basicHttpBinding>
        <binding name="CalculatorServiceSoap" closeTimeout="00:01:00"
            openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
            allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
            maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
            messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
            useDefaultWebProxy="true">
          <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
              maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <security mode="None">
            <transport clientCredentialType="None" proxyCredentialType="None"
                realm="" />
            <message clientCredentialType="UserName" algorithmSuite="Default" />
          </security>
        </binding>
      </basicHttpBinding>
    
    </bindings>
    <client>
      
      <endpoint address="http://localhost:8080/service/service.asmx"
         binding="basicHttpBinding"
         contract="IService1" name="IService1" />
    </client>
  </system.serviceModel>

 将webservice运行起来，（也可host到iis 里去。）debug console application.即可看到结果。

回家吃饭了。

细节和要注意的地方在第二节中写出来。

项目下载地址:http://files.cnblogs.com/yiyisawa/wcfclienttowebservice.rar