服务实现，每个会话一个服务实例，私有属性获取当前会话实例

        [ServiceBehavior(InstanceContextMode = InstanceContextMode.PerSession)]
        public class ser : iser
        {
                public void f(indata data)
                {
                        outdata od = new outdata();
                        od.s = data.s;

                        callback.fcallback(od);
                }

                isercallback callback
                {
                        get { return OperationContext.Current.GetCallbackChannel<isercallback>(); }
                }
        }

客户端回调实现

        public class sercallback : ser.serCallback
        {
                public void fcallback(outdata data)
                {
                        Console.WriteLine(data.s);
                }
        }

配置采用 SvcConfigEditor.exe 编辑如下

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
        <system.serviceModel>
                <behaviors>
                        <serviceBehaviors>
                                <behavior name="serBehavior">
                                        <serviceMetadata httpGetEnabled="true" />
                                </behavior>
                        </serviceBehaviors>
                </behaviors>
                <services>
                        <service behaviorConfiguration="serBehavior" name="szgamer.ser">
                                <endpoint address="" binding="wsDualHttpBinding" bindingConfiguration=""
                                        contract="szgamer.iser" />
                                <endpoint address="mex" binding="mexHttpBinding" bindingConfiguration=""
                                        contract="IMetadataExchange" />
                                <host>
                                        <baseAddresses>
                                                <add baseAddress="http://localhost:8000" />
                                        </baseAddresses>
                                </host>
                        </service>
                </services>
        </system.serviceModel>
</configuration>

操作

客户端每次回车，显示 xxx 信息

说明：

双工消息通讯需会话支持

客户端需指定回调终结点