看一个实例：

新建个会员管理服务：

    [ServiceContract]
    public interface IClientManager
    {
        [OperationContract]
        ClientEntity UpdateClientInfo(ClientEntity entity);
    }
 定义个实体：
    [DataContract]
    public class ClientEntity
    {
        [DataMember]
        public string ClientName
        {
            get;
            set;
        }
    }
服务实现：

    public class ClientManagerService : IClientManager
    {
        public ClientEntity UpdateClientInfo(ClientEntity entity)
        {
            entity.ClientName="a";
            return entity;
        }
    }
配置服务：


 <system.serviceModel>
      <services>
          <service name="ClientManagerService">
              <endpoint address="http://localhost:8899/ClientManagerService.svc" binding="basicHttpBinding"
               contract="IClientManagerService" bindingName="ClientManagerEndPoint"></endpoint>
          </service>
      </services>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="false"/>
          
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
添加引用服务：

客户端调用：

   ClientManagerProxy.ClientManagerClient proxy = new ClientManagerProxy.ClientManagerClient();
   ClientManagerProxy.ClientEntity entity=new ClientManagerProxy.ClientEntity();
   entity.ClientName="newValue";
   proxy.UpdateClientInfo(entity);

总结，在添加引用服务的时候 IDE 会自动构建创建服务代理的一切信息、包括实体，