Question

我在SO，MSDN和Code Project上阅读过很多文章。我的答案仍然没有。

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（省略了添加和删除以节省空间 - 它们按预期工作）：

[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 { }
    }
}

我的服务托管在Windows服务中。这是app.config中的system.serviceModel部分：

  <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>

最后，我创建了一个简单的Windows窗体应用程序进行测试。它被声明为：

[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;
    }

对服务的调用（_proxy.SearchCache（“mySource”））成功执行服务和服务调用_callback.OnCallback（outList）上的方法。但是我的测试应用程序中实现的回调方法永远不会被调用，因此数据永远不会传递给测试应用程序。

同样，我查看了有关SO和许多其他博客和代码网站的最新WCF文章。我觉得我需要另外一双眼睛指出明显的东西，以便我可以重新开始工作。

非常感谢，

罗伯特

WCF回调没有回电

0 个答案: