用户代码未处理CommunicationException

Question

我创建了一个解决方案，然后添加了一个包含所有WCF服务的项目。然后，我在相同的解决方案中添加了对我的Silverlight项目的引用。现在，当我尝试调试时，我得到一个消息框，上面写着This Silverlight project you are about to debug is consuming web services. Calls to the web service will fail unless the project is executed in the context of the web which contains the web service.，但是如果我运行它，我仍然会得到这样的错误:-

An error occurred while trying to make a request to URI 'http://localhost:50318/CustomersService.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.

这是详细的例外情况：

{System.ServiceModel.CommunicationException: An error occurred while trying to make a request to URI 'http://localhost:50318/CustomersService.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__DisplayClass5.<EndGetResponse>b__4(Object sendState)
   at System.Net.Browser.AsyncHelper.<>c__DisplayClass2.<BeginOnUI>b__0(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 MVVMDemo.CustomersServiceRef.CustomersServiceClient.CustomersServiceClientChannel.EndGetCustomers(IAsyncResult result)
   at MVVMDemo.CustomersServiceRef.CustomersServiceClient.MVVMDemo.CustomersServiceRef.ICustomersService.EndGetCustomers(IAsyncResult result)
   at MVVMDemo.CustomersServiceRef.CustomersServiceClient.OnEndGetCustomers(IAsyncResult result)
   at System.ServiceModel.ClientBase`1.OnAsyncCallCompleted(IAsyncResult result)}

我该怎么办？

提前感谢：)

Answer 1

如果您托管silverlight控件的页面和您尝试连接的webservice位于不同的域中(在我们的情况下，它们看起来像是不同的项目)，则需要将clientaccesspolicy.xml文件添加到您的网站中。

<?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>

有关更多详细信息，请查看此link