C# WCF回调不回拨

我在这里读了很多关于SO、MSDN和代码项目的文章。我仍然找不到答案

我创建了一个具有回调契约的WCF服务，以及一个实现回调接口的Windows窗体应用程序（测试工具）

以下是接口：

[ServiceContract]
public interface ICacheService
{
    [OperationContract]
    bool AddToCache(string type, string key, string source, object item, int duration);


    [OperationContract]
    bool Remove(string key);
}



[ServiceContract(SessionMode=SessionMode.Required, CallbackContract=typeof(ISearchCallback))]
public interface ICacheSearch
{
    [OperationContract(IsOneWay=true)]
    void SearchCache(string source);
}



public interface ISearchCallback
{
    [OperationContract(IsOneWay=true)]
    void OnCallback(object data);
}

我的服务（省略添加和删除以节省空间-它们按预期工作）：

对服务的调用（_proxy.SearchCache（“mySource”））成功地对服务执行了方法，并对服务调用了_callback.OnCallback（outList）。但是，在我的测试应用程序中实现的回调方法从未被调用，因此数据从未传输到测试应用程序

再一次，我查看了SO和许多其他博客和代码站点上最近的每一篇WCF文章。我觉得我需要另一双眼睛来指出显而易见的事情，这样我才能回去工作

非常感谢,

---

罗伯特

只是为了测试一下。你能运行这个代码吗在刷新列表中？我怀疑你的线程已被阻止，无法处理你的回调。我仍在使用.NET 4，但使用System.Threading.Tasks.Task.Factory.StartNew（（）=>\u proxy.SearchCache（“mySource”）；毫无例外地运行。然后呢？您的回调方法现在被调用了吗？在向缓存中添加一个项（该项调用RefreshList（）方法）之后，我得到了以下结果：没有端点侦听可以接受消息。这通常是由不正确的地址或SOAP操作引起的。有关更多详细信息，请参阅InnerException（如果存在）。内部异常：无法建立连接，因为目标计算机主动拒绝了它127.0.0.1:5055。舞台调度？

[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single, ConcurrencyMode=ConcurrencyMode.Multiple)]
public class CachingService : ICacheService, ICacheSearch, IDisposable
{
    private List<ICache> _cacheList = new List<ICache>();
    private ISearchCallback _callback = null;


    public void SearchCache(string source)
    {
        try
        {
            _callback = OperationContext.Current.GetCallbackChannel<ISearchCallback>();
            List<object> items = new List<object>();
            foreach (ICache cache in this._cacheList)
            {
                foreach (CacheItem item in cache.GetCacheItemsBySource(source))
                {
                    items.Add(item.Value);
                }
            }

            ReadOnlyCollection<object> outList = new ReadOnlyCollection<object>(items);
            _callback.OnCallback(outList);
        }
        catch { }
    }
}

  <system.serviceModel>
    <bindings>
      <wsHttpBinding>
        <binding 
          name="WSHttpBinding_ICacheService" 
          closeTimeout="00:01:00" 
          openTimeout="00:01:00" 
          receiveTimeout="00:01:00" 
          sendTimeout="00:01:00" 
          maxBufferPoolSize="2147483647" 
          maxReceivedMessageSize="2147483647">
          <readerQuotas maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxDepth="2147483647" maxNameTableCharCount="2147483647" maxStringContentLength="2147483647"/>
        </binding>
      </wsHttpBinding>
      <wsDualHttpBinding>
        <binding
          name="WSDualHttpBinding_ICacheSearch"
          closeTimeout="00:01:00"
          openTimeout="00:01:00"
          receiveTimeout="00:01:00"
          sendTimeout="00:01:00"
          maxBufferPoolSize="2147483647"
          maxReceivedMessageSize="2147483647"
          clientBaseAddress="http://localhost:5057/wsDualHttpBinding"
          useDefaultWebProxy="true"
          transactionFlow="false">
          <readerQuotas maxArrayLength="2147483647" maxBytesPerRead="2147483647" maxDepth="2147483647" maxNameTableCharCount="2147483647" maxStringContentLength="2147483647"/>
        </binding>
      </wsDualHttpBinding>
    </bindings>
    <behaviors>
      <serviceBehaviors>
        <behavior>
          <serviceMetadata httpGetEnabled="true" />
          <serviceDebug includeExceptionDetailInFaults="false"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
    <services>
      <service name="CacheService.CachingService">
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:5055/CachingService/"/>
          </baseAddresses>
        </host>
        <endpoint address="Search" binding="wsDualHttpBinding" contract="CacheService.ICacheSearch" />
        <endpoint address="" binding="wsHttpBinding" contract="CacheService.ICacheService" />
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
      </service>
    </services>
    <client>
      <endpoint address="http://localhost:5055/CachingService/Search" binding="wsDualHttpBinding"
          bindingConfiguration="WSDualHttpBinding_ICacheSearch" contract="CacheService.ICacheSearch"
          name="WSDualHttpBinding_ICacheSearch" />
      <endpoint address="http://localhost:5055/CachingService" binding="wsHttpBinding"
    bindingConfiguration="WSHttpBinding_ICacheService" contract="CacheService.ICacheService"
    name="WSHttpBinding_ICacheService" />
    </client>
  </system.serviceModel>

[CallbackBehavior(UseSynchronizationContext = false, ConcurrencyMode = ConcurrencyMode.Single)]
public partial class Form1 : Form, cacheService.ICacheSearchCallback
{
    InstanceContext context = null;
    cacheService.CacheServiceClient _service = null;
    cacheService.CacheSearchClient _proxy = null;

    private void Form1_Load(object sender, EventArgs e)
    {
        _syncContext = System.Threading.SynchronizationContext.Current;
        _service = new cacheService.CacheServiceClient();
        this.dataGridView1.AutoGenerateColumns = true;

        context = new InstanceContext(this);
        _proxy = new cacheService.CacheSearchClient(context);

        RefreshList();
    }


    private void RefreshList()
    {
        _proxy.SearchCache("mySource");
    }


    public void OnCallback(object data)
    {
        this._data = data;
        this.dataGridView1.DataSource = this._data;
    }