服务器端：
[ServiceContract(SessionMode=SessionMode.Required ,CallbackContract=typeof(IEHAOYAOCallback))]
public interface IEHAOYAOMessageService
{
[OperationContract(IsOneWay = false, IsInitiating = true, IsTerminating = false)]
string Join(string agentId);
[OperationContract(IsOneWay = true, IsInitiating = false, IsTerminating = false)]
void Leave();
[OperationContract(IsOneWay = false,IsInitiating = false, IsTerminating = false)]
string ClearWait();
[OperationContract(IsOneWay = false, IsInitiating = false, IsTerminating = false)]
string CloseSeesion(string customerOpenID);
[OperationContract(IsOneWay = true, IsInitiating = false, IsTerminating = false)]
void GetWaitCustomer();
[OperationContract(IsOneWay = false, IsInitiating = false, IsTerminating = false)]
string UpdateStatus(int status);
}
public interface IEHAOYAOCallback
{
[OperationContract(IsOneWay = true)]
void ReceiveTextMessage(TextEntity messageEntity);
[OperationContract(IsOneWay=true)]
void ReceiveImageMessage(ImageEntity messageEntity);
[OperationContract(IsOneWay = true)]
void ReceiveVoiceMessage(VoiceEntity messageEntity);
}
配置文件：
<?xml version="1.0"?>
<configuration>
<system.web>
<compilation debug="true" targetFramework="4.0"/>
<pages controlRenderingCompatibilityVersion="3.5" clientIDMode="AutoID"/></system.web>
<system.serviceModel>
<behaviors>
<serviceBehaviors>
<behavior>
<!--为避免泄漏元数据信息，请在部署前将以下值设置为 false 并删除上面的元数据终结点-->
<serviceMetadata httpGetEnabled="true"/>
<!--要接收故障异常详细信息以进行调试，请将以下值设置为 true。在部署前设置为 false 以避免泄漏异常信息-->
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
<services>
<service name="WCFService.EHAOYAOMessageService">
<endpoint address="" binding="wsDualHttpBinding" bindingConfiguration="myBindingNone" contract="WCFService.IEHAOYAOMessageService" />
<endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
</service>
</services>
<bindings>
<wsDualHttpBinding>
<binding name="myBindingNone" sendTimeout="00:04:00">
<security mode="None">
</security>
</binding>
</wsDualHttpBinding>
</bindings>
<serviceHostingEnvironment multipleSiteBindingsEnabled="true"/>
</system.serviceModel>
<system.webServer>
<modules runAllManagedModulesForAllRequests="true"/>
</system.webServer>
</configuration>
客户端：
private void Form1_Load(object sender, EventArgs e)
{
client = new EHAOYAOMessageServiceClient(new System.ServiceModel.InstanceContext(this));
}
private void button2_Click(object sender, EventArgs e)
{
MessageBox.Show(client.Join(txtAgent.Text));
}
