[ServiceContract(Namespace = "http://Microsoft.ServiceModel.Samples", SessionMode = SessionMode.Required,                    CallbackContract = typeof(ITransferCallback))]  如果要使用回调，必须加上这句话    public interface IMonitorService    {        [OperationContract(IsOneWay = true)]        void MonitorOnlineService(string strJson);    }

       [ServiceContract(CallbackContract = typeof(IMonitorService))]          public interface ITransferCallback        {            [OperationContract(IsOneWay = true)]            void ReturnResult(string strJson);        }

  public class TransferCallback : ITransferCallback    {        public void ReturnResult(string strJson)        {            Console.WriteLine("start service");            Monitor.MonitorOnlineService(strJson);        }        private IMonitorService Monitor {            get            {                return OperationContext.Current.GetCallbackChannel<IMonitorService>();            }        }    }

<?xml version="1.0" encoding="utf-8" ?><configuration>    <startup>         <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />    </startup>         <system.serviceModel>        <behaviors>          <serviceBehaviors>            <behavior name="NewBehavior0">              <serviceMetadata httpGetEnabled="true" />            </behavior>          </serviceBehaviors>        </behaviors>                <services>          <service name="WcfServer.TransferCallback">            <endpoint address="net.tcp://127.0.0.1:8000/TransferCallback"                binding="netTcpBinding" bindingConfiguration="" contract="WcfServer.ITransferCallback" />            <host>              <baseAddresses>                <add baseAddress="net.tcp://127.0.0.1:8000/TransferCallback" />              </baseAddresses>            </host>          </service>        </services>                <bindings>          <basicHttpBinding>            <binding name="basicHttpBind" closeTimeout="00:10:00" openTimeout="00:05:00"              receiveTimeout="00:10:00" sendTimeout="00:05:00" allowCookies="false"              bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"              maxBufferPoolSize="2147483647" maxBufferSize="2147483647" maxReceivedMessageSize="2147483647"              textEncoding="utf-8" transferMode="Buffered" useDefaultWebProxy="true"              messageEncoding="Text">              <readerQuotas maxStringContentLength="2097152" />              <security mode="None" />            </binding>          </basicHttpBinding>          <netTcpBinding>            <binding name="TransferNetTcpBind" closeTimeout="00:10:00" openTimeout="00:05:00" receiveTimeout="00:10:00" sendTimeout="00:05:00" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647" maxBufferSize="2147483647">              <readerQuotas maxStringContentLength="2097152"/>              <security mode="None"></security>            </binding>            <binding name="NetTcpBinding_ITransferCallback" closeTimeout="00:01:00"                  openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"                  transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions"                  hostNameComparisonMode="StrongWildcard" listenBacklog="10"                  maxBufferPoolSize="524288" maxBufferSize="65536" maxConnections="10"                  maxReceivedMessageSize="65536">              <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"                  maxBytesPerRead="4096" maxNameTableCharCount="16384" />              <reliableSession ordered="true" inactivityTimeout="00:10:00"                  enabled="false" />              <security mode="Transport">                <transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />                <message clientCredentialType="Windows" />              </security>            </binding>          </netTcpBinding>        </bindings>                <client>          <endpoint address="net.tcp://127.0.0.1:9000/MonitorService"              binding="netTcpBinding" bindingConfiguration="NetTcpBinding_ITransferCallback"              contract="IMonitorService" name="NetTcpBinding_ITransferCallback">          </endpoint>                  </client>      </system.serviceModel>  </configuration>

 class Program    {        static void Main(string[] args)        {            using (ServiceHost host = new ServiceHost(typeof(DataTransferCallback)))            {                ServiceMetadataBehavior smb = host.Description.Behaviors.Find<ServiceMetadataBehavior>();                if (smb == null)                    host.Description.Behaviors.Add(new ServiceMetadataBehavior());                //暴露出元数据，以便能够让SvcUtil.exe自动生成配置文件                host.AddServiceEndpoint(typeof(IMetadataExchange), MetadataExchangeBindings.CreateMexTcpBinding(), "mex");                //开启服务                host.Open();                Console.WriteLine("Service listen begin to listen...");                Console.WriteLine("press any key to teriminate...");                Console.ReadKey();                host.Abort();                host.Close();            }        }    }

 public class MonitorService : IMonitorService    {        #region        /// <summary>        ///     写入集成控制平台数据        /// </summary>        /// <param name="strJson">JSON字符串</param>        /// <param name="strOrgCode">直属库编号</param>        /// <param name="strTableName">表明</param>        /// <returns></returns>        public void MonitorOnlineService(string strJson)        {Callback.ReturnResult(result);        }        #endregion        ITransferCallback Callback        {            get            {                return OperationContext.Current.GetCallbackChannel<ITransferCallback>();            }        }    }

调用服务new ChannelFactory<IDataTransferCallback>("NetTcpBinding_ITransferCallback").CreateChannel().ReturnResult("Hello");

<system.serviceModel>                                                    <client>                                                        <endpoint address="net.tcp://127.0.0.1:8000/TransferCallback"                                                            binding="netTcpBinding" bindingConfiguration="NetTcpBinding_ITransferCallback"                                                            contract="ITransferCallback" name="NetTcpBinding_ITransferCallback">                                                        </endpoint>                                                </client>              <services>      <service name="MonitorService">        <host>          <baseAddresses>            <add baseAddress="net.tcp://127.0.0.1:9000/MonitorService" />           </baseAddresses>        </host>         <endpoint address="net.tcp://127.0.0.1:9000/MonitorService" binding="netTcpBinding" bindingConfiguration="TransferNetTcpBind"                  contract="IMonitorService"/>        <endpoint address="mex" binding="mexTcpBinding" contract="IMetadataExchange"/>      </service>    </services>    <bindings>           <netTcpBinding>        <binding name="TransferNetTcpBind" closeTimeout="00:10:00" openTimeout="00:05:00" receiveTimeout="00:10:00" sendTimeout="00:05:00" maxBufferPoolSize="2147483647" maxReceivedMessageSize="2147483647" maxBufferSize="2147483647">          <readerQuotas maxStringContentLength="2097152"/>          <security mode="None"></security>        </binding>                                          <binding name="NetTcpBinding_ITransferCallback" closeTimeout="00:01:00"                                                openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"                                                transactionFlow="false" transferMode="Buffered" transactionProtocol="OleTransactions"                                                hostNameComparisonMode="StrongWildcard" listenBacklog="10"                                                maxBufferPoolSize="524288" maxBufferSize="65536" maxConnections="10"                                                maxReceivedMessageSize="65536">                                                <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"                                                    maxBytesPerRead="4096" maxNameTableCharCount="16384" />                                                <reliableSession ordered="true" inactivityTimeout="00:10:00"                                                    enabled="false" />                                                <security mode="Transport">                                                    <transport clientCredentialType="Windows" protectionLevel="EncryptAndSign" />                                                    <message clientCredentialType="Windows" />                                                </security>                                            </binding>      </netTcpBinding>    </bindings>    <behaviors>      <serviceBehaviors>        <behavior name="">          <serviceMetadata httpGetEnabled="False"/>          <serviceDebug includeExceptionDetailInFaults="false" />        </behavior>      </serviceBehaviors>    </behaviors>  </system.serviceModel>