引用 Windows 服务的 WCF 调用

我有一个长时间运行的服务，它从一个源获取数据，对其进行操作，将其存储在数据库中等。

我想向其他应用程序公开该服务上的一些方法。目前我们通过 .NET 远程处理执行此操作，但我想迁移到 WCF。

不幸的是，我连接到的终结点从来都不是我通过长时间运行的服务公开的终结点。下面是一个简单的例子：

    [ServiceContract]
    public interface ITestWcfService
    {
        [OperationContract]
        CounterResult GetCurrentValue();
    }
public class TestWcfService : ITestWcfService
    {
        private ITestWindowsService _service;
        public TestWcfService() { /*NOTE: For discoverability*/ }
        public TestWcfService(ITestWindowsService service)
        {
            _service = service;
        }
        public CounterResult GetCurrentValue()
        {
            return _service.GetCurrentValue();
        }
    }
public interface ITestWindowsService
    {
        CounterResult GetCurrentValue();
    }

然后我有了我的实际 Windows 服务，它通过 ServiceHost 类自托管 WCF 服务。

public partial class TestWindowsService : ServiceBase, ITestWindowsService
{
    private static ServiceHost _wcfService;
    public TestWindowsService()
    {
        InitializeComponent();
    }
    public void OnStart(string[] args)
    {
        //Create instance of WCF, passing in reference to this service instance
        TestWcfService wcf = new TestWcfService(this);
        _wcfService = new ServiceHost(wcf);
    }
        public CounterResult GetCurrentValue()
    {
        //Note: Some logic here
    }
}

现在，这或多或少有效，除了每次我调用TestWcfServiceClient()时，它使用默认构造函数并创建 Wcf 服务的新实例，而不使用 Windows 服务创建的实例。这意味着当我调用GetCurrentValue()时，我得到一个空引用，因为尚未设置_service成员。

我四处寻找解决方案，发现一些引用ServiceHostFactory和ServiceHost和IInstanceProvider，但每个似乎都非常非常复杂。

您能提供的任何想法将不胜感激。

编辑：这是我的服务模型信息

<system.serviceModel>
    <services>
      <service name="WcfService.TestWcfService">
        <host>
          <baseAddresses>
            <add baseAddress = "http://localhost:8733/Design_Time_Addresses/WcfService/TestWcfService/" />
          </baseAddresses>
        </host>
        <!-- Service Endpoints -->
        <!-- Unless fully qualified, address is relative to base address supplied above -->
        <endpoint address="" binding="basicHttpBinding" contract="WcfService.ITestWcfService">
          <!-- 
              Upon deployment, the following identity element should be removed or replaced to reflect the 
              identity under which the deployed service runs.  If removed, WCF will infer an appropriate identity 
              automatically.
          -->
          <identity>
            <dns value="localhost"/>
          </identity>
        </endpoint>
        <!-- Metadata Endpoints -->
        <!-- The Metadata Exchange endpoint is used by the service to describe itself to clients. --> 
        <!-- This endpoint does not use a secure binding and should be secured or removed before deployment -->
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, 
          set the values below to false before deployment -->
          <serviceMetadata httpGetEnabled="True" httpsGetEnabled="True"/>
          <!-- To receive exception details in faults for debugging purposes, 
          set the value below to true.  Set to false before deployment 
          to avoid disclosing exception information -->
          <serviceDebug includeExceptionDetailInFaults="False" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>