无法连接到 silverlight 应用程序中的 wcf 服务

Question

(已解决)[提醒] 对于遇到同样问题的人： 如果您将clientaccesspolicy.xml和crossdomain.xml放在正确的文件夹中时收到相同的错误消息，请检查您是否接受了服务端的自签名证书。

接受证书：在浏览器中输入服务的url，浏览器会询问你是否信任它。还有一个安装证书的选项，并且不会从该站点收到有关证书的更多警告。

[原问题] 我的 silverlight 应用程序无法连接到 wcf 服务。抛出异常。

System.Reflection.TargetInvocationException: An exception occurred during the operation, making the result invalid.  Check InnerException for exception details. ---> System.ServiceModel.CommunicationException: An error occurred while trying to make a request to URI 'http://fyp-pc13:97/HelloWorldService/HelloWorld.svc'. This could be due to attempting to access a service in a cross-domain way without a proper cross-domain policy in place, or a policy that is unsuitable for SOAP services. You may need to contact the owner of the service to publish a cross-domain policy file and to ensure it allows SOAP-related HTTP headers to be sent. This error may also be caused by using internal types in the web service proxy without using the InternalsVisibleToAttribute attribute. Please see the inner exception for more details. ---> System.Security.SecurityException ---> System.Security.SecurityException: Security error.
   at System.Net.Browser.BrowserHttpWebRequest.InternalEndGetResponse(IAsyncResult asyncResult)
   at System.Net.Browser.BrowserHttpWebRequest.<>c__DisplayClassa.<EndGetResponse>b__9(Object sendState)
   at System.Net.Browser.AsyncHelper.<>c__DisplayClass4.<BeginOnUI>b__1(Object sendState)
   --- End of inner exception stack trace ---
   at System.Net.Browser.AsyncHelper.BeginOnUI(SendOrPostCallback beginMethod, Object state)
   at System.Net.Browser.BrowserHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
   at System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelAsyncRequest.CompleteGetResponse(IAsyncResult result)
   --- End of inner exception stack trace ---
   at System.ServiceModel.AsyncResult.End[TAsyncResult](IAsyncResult result)
   at System.ServiceModel.Channels.ServiceChannel.EndCall(String action, Object[] outs, IAsyncResult result)
   at System.ServiceModel.ClientBase`1.ChannelBase`1.EndInvoke(String methodName, Object[] args, IAsyncResult result)
   at SilverlightApplication1.ServiceReference1.HelloServiceClient.HelloServiceClientChannel.EndHello(IAsyncResult result)
   at SilverlightApplication1.ServiceReference1.HelloServiceClient.SilverlightApplication1.ServiceReference1.IHelloService.EndHello(IAsyncResult result)
   at SilverlightApplication1.ServiceReference1.HelloServiceClient.OnEndHello(IAsyncResult result)
   at System.ServiceModel.ClientBase`1.OnAsyncCallCompleted(IAsyncResult result)
   --- End of inner exception stack trace ---
   at System.ComponentModel.AsyncCompletedEventArgs.RaiseExceptionIfNecessary()
   at SilverlightApplication1.ServiceReference1.HelloCompletedEventArgs.get_Result()
   at SilverlightApplication1.MainPage.ialert(Object sender, HelloCompletedEventArgs msg)

该服务在控制台应用程序中运行良好。所以我猜这是我的silverlight应用配置的问题。

Web.config

<?xml version="1.0"?>
<configuration>

  <system.web>
    <compilation debug="true" targetFramework="4.0" />
  </system.web>
  <system.serviceModel>
    <bindings>

      <basicHttpBinding>
        <binding name="BasicHttpBinding_IHelloService" closeTimeout="00:01:00"
            openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"
            allowCookies="false" bypassProxyOnLocal="false" hostNameComparisonMode="StrongWildcard"
            maxBufferSize="65536" maxBufferPoolSize="524288" maxReceivedMessageSize="65536"
            messageEncoding="Text" textEncoding="utf-8" transferMode="Buffered"
            useDefaultWebProxy="true">
          <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384"
              maxBytesPerRead="4096" maxNameTableCharCount="16384" />
          <security mode="None" />
        </binding>
      </basicHttpBinding>

    </bindings>

    <services>
      <service name="WcfService1.HelloWorld">
        <endpoint address="" binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IHelloService" contract="WcfService1.IHelloService" name="BasicHttpBinding_IHelloService" />
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange"/>
      </service>
    </services>

    <behaviors>
      <serviceBehaviors>
        <behavior>
          <!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
          <serviceMetadata httpGetEnabled="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>

    <serviceHostingEnvironment multipleSiteBindingsEnabled="false" />

  </system.serviceModel>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true"/>
  </system.webServer>

</configuration>

ServiceReferences.ClientConfig：

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <system.serviceModel>
        <bindings>
            <basicHttpBinding>
                <binding name="BasicHttpBinding_IHelloService" maxBufferSize="2147483647"
                    maxReceivedMessageSize="2147483647">
                    <security mode="None" />
                </binding>
            </basicHttpBinding>
        </bindings>
        <client>
            <endpoint address="http://fyp-pc13:97/HelloWorldService/HelloWorld.svc"
                binding="basicHttpBinding" bindingConfiguration="BasicHttpBinding_IHelloService"
                contract="ServiceReference1.IHelloService" name="BasicHttpBinding_IHelloService" />
        </client>
    </system.serviceModel>
</configuration>

谁能帮我解决这个问题？我一直坚持配置文件好几天了。非常感谢。

Answer 1

这可能是由于 Silverlight 中的安全原因，您的异常文本提供了一个方向的线索：“[...]可能是由于尝试以跨域方式访问服务而没有适当的跨域政策到位，[...]"

将 clientaccesspolicy.xml 文件放置在所在域的根目录中 托管服务以配置服务以允许跨域 访问。

如果您使用的是 IIS，这可能是 \inetpub\wwwroot\ 文件夹，但这可能因您的配置而异。

这是一个纯文本 XML 文件，包含以下几行（可能会根据您的需要进行调整）：

<?xml version="1.0" encoding="utf-8"?>
<access-policy>
  <cross-domain-access>
    <policy>
      <allow-from http-request-headers="SOAPAction">
        <domain uri="*"/>
      </allow-from>
      <grant-to>
        <resource path="/" include-subpaths="true"/>
      </grant-to>
    </policy>
  </cross-domain-access>
</access-policy>

更多信息在这里：Making a Service Available Across Domain Boundaries

[编辑]

如果这不起作用，还可以尝试将 crossdomain.xml 文件放入 Web 服务。

将有效的 crossdomain.xml 文件放在域的根目录中 托管服务。该文件必须将整个域标记为公开。

这包含以下几行：

<?xml version="1.0"?>
<!DOCTYPE cross-domain-policy SYSTEM "http://www.macromedia.com/xml/dtds/cross-domain-policy.dtd">
<cross-domain-policy>
  <allow-http-request-headers-from domain="*" headers="SOAPAction,Content-Type"/>
</cross-domain-policy>