Question

我正在使用pollingDuplex绑定来实现Silverlight Web应用程序和我的WCF Web服务之间的通信。直到我尝试将大量数据从Web应用程序以xmlString的形式发送到Web服务，它才能正常工作。然后我收到了错误消息：

“格式化程序在尝试反序列化消息时抛出异常：对操作'SendUserSelection'反序列化请求消息体时出错。读取XML数据时已超出最大字符串内容长度配额（8192）。通过更改创建XML阅读器时使用的XmlDictionaryReaderQuotas对象的MaxStringContentLength属性，可以增加配额。“

我发现为了增加MaxStringContentLength属性，我必须将pollingDuplex绑定转换为自定义绑定（http://blogs.msdn.com/b/silverlightws/archive/2010/04/04/some-known-wcf-issues-in-silverlight-4.aspx）。我的问题是我该怎么做？

我在web服务的web.config文件中定义的pollingDuplex绑定看起来如下：

<pollingDuplex>
  <binding name="myPollingDuplex" closeTimeout="00:10:00" openTimeout="00:10:00"
    receiveTimeout="00:10:00" sendTimeout="00:10:00" duplexMode="MultipleMessagesPerPoll" />

终点：

<endpoint address="" binding="pollingDuplex" bindingConfiguration="myPollingDuplex" contract="WebApplication.Web.MainWS"/>

Web应用程序端用于实例化Web服务客户端的代码：

this.client = new MainWSRef.MainWSClient(new PollingDuplexHttpBinding { DuplexMode = PollingDuplexMode.MultipleMessagesPerPoll },
            new EndpointAddress("http://localhost:1981/MainWS.svc"));

我尝试了以下内容：

<customBinding>
    <binding name="myPollingDuplex" closeTimeout="00:10:00" openTimeout="00:10:00"
    receiveTimeout="00:10:00" sendTimeout="00:10:00">
      <pollingDuplex duplexMode="MultipleMessagesPerPoll">
      </pollingDuplex>
      <textMessageEncoding>
      <readerQuotas maxDepth="32" maxStringContentLength="5242880"
      maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" />
        </textMessageEncoding>
      <security mode="TransportWithMessageCredential">
        <transport clientCredentialType="None" proxyCredentialType="None"
          realm="" />
        <message clientCredentialType="UserName" algorithmSuite="Default" />
      </security>
    </binding>
  </customBinding>

端点：

<endpoint address="" binding="customBinding" bindingConfiguration="myPollingDuplex" contract="WebApplication.Web.MainWS"/>

Web应用程序端的代码：

CustomBinding binding = new CustomBinding(new PollingDuplexBindingElement(), new BinaryMessageEncodingBindingElement(), new HttpTransportBindingElement());
        this.client = new MainWSRef.MainWSClient(binding, new EndpointAddress("http://localhost:1981/MainWS.svc"));

当我尝试运行代码时，我收到以下错误消息：

“远程服务器返回错误：NotFound。”

我做错了吗？我很感激任何建议。

Answer 1

当我指定ReceiveTimeout="02:00:00"时，我收到同样的错误，没有它，它正在工作。我试着找出如何在没有错误的情况下设置ReveiveTimeout。

更新：我认为它的工作，那就是我的服务器web.config：

<customBinding>
    <binding name="SLDuplexService" receiveTimeout="02:00:00">
      <pollingDuplex duplexMode="MultipleMessagesPerPoll"
           maxPendingSessions="2147483647" maxPendingMessagesPerSession="2147483647" maxOutputDelay="00:00:05"
                     inactivityTimeout="02:00:00" />
      <binaryMessageEncoding/>
      <httpTransport transferMode="StreamedResponse"/>
    </binding>
  </customBinding>

请注意，receiveTimeout是绑定的属性，而inactivityTimeout是pollingDuplex的属性。如果您在10分钟后不想要出现故障通道，则必须设置两个超时。

您还必须在客户端上指定超时，这就是我的代码：

PollingDuplexHttpBinding binding = new PollingDuplexHttpBinding(PollingDuplexHttpSecurityMode.None, PollingDuplexMode.MultipleMessagesPerPoll);
            binding.InactivityTimeout = new TimeSpan(2,0,0);
            binding.ReceiveTimeout = new TimeSpan(2, 0, 0);

          _client = new SLDuplexServiceClient(binding, new EndpointAddress("http://localhost/LpSystem.ServiceInterface.Web/SLDuplexService/SLDuplexService.svc"));

如何将pollingDuplex绑定转换为自定义绑定？

1 个答案: