從 Silverlight 客戶端使用托管在 IIS 中的 WF 服務時出現問題

Question

我正在嘗試從 Silverlight 客戶端使用托管在 IIS express (xamlx) 中的 WF 服務。

我添加了我的服務參考，當我使用客戶端代理時，我得到了這個：

System.ServiceModel.CommunicationException was unhandled by user code
  Message=An error occurred while trying to make a request to URI 'http://localhost:52878/Workflows/PerformanceAppraisal/Exempt.xamlx'. 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.
  StackTrace:
       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 CompanyHR.ExemptPAService.ExemptPAClient.ExemptPAClientChannel.EndInitiatePerformanceAppraisal(IAsyncResult result)
       at CompanyHR.ExemptPAService.ExemptPAClient.CompanyHR.ExemptPAService.IExemptPA.EndInitiatePerformanceAppraisal(IAsyncResult result)
       at CompanyHR.ExemptPAService.ExemptPAClient.OnEndInitiatePerformanceAppraisal(IAsyncResult result)
       at System.ServiceModel.ClientBase`1.OnAsyncCallCompleted(IAsyncResult result)
  InnerException: System.Security.SecurityException
       Message=""
       StackTrace:
            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)
       InnerException: System.Security.SecurityException
            Message=Security error.
            StackTrace:
                 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__DisplayClass4.<BeginOnUI>b__1(Object sendState)
            InnerException: 

當我添加服務參考時，我沒有使用http://localhost:52878/Workflows/PerformanceAppraisal/Exempt.xamlx

我使用了 https 版本。 但它似乎正在使用這個 url 代替。

我在 Visual Studio 2010 中使用 IIS Express。

Answer 1

關於無法找到clientaccesspolicy.xml的錯誤消息非常清楚。 這是在不同站點上調用服務然后 Silverlight 應用程序正在運行的結果。 您沒有在 Silverlight 應用程序中提到 URL ，但它可能是使用 HTTPS 或完全不同的站點的情況。