c# 4.0 - System.Security.SecurityException:在Silverlight 5应用程

Question

我正在尝试在Silverlight 5应用程序中使用WCF数据服务。NET 4.0应用程序。当我手动查询服务时，我可以在web浏览器中看到作为Atom提要的数据。

然而，当我试图通过标准方法查询数据时，我得到以下错误:

{System.Security。SecurityException:安全错误。在System.Net.Browser.ClientHttpWebRequest。EndGetResponse (IAsyncResult asyncResult)在System.Data.Services.Http.ClientHttpWebRequest。EndGetResponse (IAsyncResult asyncResult)在System.Data.Services.Client.QueryResult。AsyncEndGetResponse (IAsyncResult asyncResult)}

内部异常为空。所以目前还没有有意义的信息。

我的代码

public partial class ProjectWindow : ChildWindow
{
XYZEntitis.XYZEntitis db = new XYZEntitis.XYZEntitis(new Uri("http://google.com/wcfdataservice1.svc/"));

    DataServiceCollection<XYZEntitis.Label> dscCats = new DataServiceCollection<XYZEntitis.Label>();
    CollectionViewSource customerAddressViewSource;
    ObservableCollection<XYZEntitis.Label> labelsBindingCollection = new ObservableCollection<XYZEntitis.Label>();
public ProjectWindow()
    {
        InitializeComponent();
        btnBack.IsEnabled = false;
        //Load Project categories
        BindProjectCategories();
    }
public void BindProjectCategories()
        {
            #region Code
            //#############################################
            //Approach # 01 : Raises Security Exception
            //#############################################
            //DataServiceQuery<XYZEntitis.Label> query = db.Labels;
            //query.BeginExecute(
            //    s =>
            //    {
            //        var state = s.AsyncState as DataServiceQuery<XYZEntitis.Label>;
            //        var data = new ObservableCollection<XYZEntitis.Label>();
            //        foreach (var entity in state.EndExecute(s))
            //            data.Add(entity);
            //        cbCategoryName.ItemsSource = data;
            //    }, query);
            #endregion
            //#############################################
            //Approach No # 2 : 0 Records are returned
            //#############################################
            var cats = from cat in db.Labels select cat;
            //cats.ToList();
            dscCats.LoadCompleted += this.dscCats_LoadCompleted;
            dscCats.LoadAsync(cats);
            //#############################################
            //Approach # 3 : Security Exception
            //#############################################
            //var query = from cat in db.Labels select cat;
            //((DataServiceQuery<XYZEntitis.Label>)query).BeginExecute(OnCategoriesFecthComplete, query);
        }
private void OnCategoriesFecthComplete(IAsyncResult ar)
    {
        var query = ar.AsyncState as DataServiceQuery<XYZEntitis.Label>;
        // Get the response of the query.
        var response = query.EndExecute(ar);
        foreach (XYZEntitis.Label label in response)
        {
            labelsBindingCollection.Add(label);
        }
        cbCategoryName.ItemsSource = labelsBindingCollection;
    }
private void dscCats_LoadCompleted(object sender, LoadCompletedEventArgs e)
    {
        if (dscCats.Continuation != null)
        {
            dscCats.LoadNextPartialSetAsync();
        }
        else
        {
            cbCategoryName.ItemsSource = dscCats;
            #region code
            //var data = (DataServiceCollection<XYZEntitis.Label>)sender;
            //cbCategoryName.ItemsSource = data;
            //cbCategoryName.DisplayMemberPath = "Name";   
            //customerAddressViewSource =
            //       (CollectionViewSource)this.Resources["customerAddressViewSource"];
            //customerAddressViewSource.Source = dscCats;
            #endregion
        }
    }

}

完成堆栈跟踪(Stack Trace 1):

系统。InvalidOperationException未被用户代码处理消息=处理此请求时发生错误。加:在System.Data.Services.Client.BaseAsyncResult。endexexecute [T](对象源，字符串方法，asyncResult)在System.Data.Services.Client.QueryResult。EndExecute[element](对象源，asyncResult asyncResult)在System.Data.Services.Client.DataServiceRequest。endexexecute [element](对象源，DataServiceContext上下文，IAsyncResult asyncResult)在System.Data.Services.Client.DataServiceQuery 1。EndExecute (IAsyncResult asyncResult)在ThreatModeler.Silverlight.ProjectWindow。OnCategoriesFecthComplete (IAsyncResult ar)在System.Data.Services.Client.BaseAsyncResult.HandleCompleted ()在System.Data.Services.Client.QueryResult。AsyncEndGetResponse (IAsyncResult asyncResult)在System.Data.Services.Client.BaseAsyncResult灵活;> c_ DisplayClass1。b _0 (IAsyncResult asyncResult)在System.Net.Browser.ClientHttpWebRequest灵活;> c_ DisplayClass1a。b _18 state2(对象)在System.Threading.QueueUserWorkItemCallback。WaitCallback_Context(对象状态)在System.Threading.ExecutionContext。运行(ExecutionContext ExecutionContext, ContextCallback, callback, Object state, Boolean, preserveSyncCtx)在System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem ()在System.Threading.ThreadPoolWorkQueue.Dispatch ()在System.Threading._ThreadPoolWaitCallback.PerformWaitCallback ()InnerException: System.Security.SecurityException=安全错误消息。加:在System.Net.Browser.ClientHttpWebRequest。EndGetResponse (IAsyncResult asyncResult)在System.Data.Services.Http.ClientHttpWebRequest。EndGetResponse (IAsyncResult asyncResult)在System.Data.Services.Client.QueryResult。AsyncEndGetResponse (IAsyncResult asyncResult)InnerException:

完成堆栈跟踪(Stack Trace #02)

{系统。InvalidOperationException:处理过程中发生错误这个请求。--> System.Security.SecurityException:安全错误。System.Net.Browser.ClientHttpWebRequest.EndGetResponse (IAsyncResultasyncResult)System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse (IAsyncResultasyncResult)System.Data.Services.Client.QueryResult.AsyncEndGetResponse (IAsyncResult内部异常堆栈跟踪结束——atSystem.Data.Services.Client.BaseAsyncResult.EndExecute [T](对象来源，字符串方法，IAsyncResult asyncResult) atSystem.Data.Services.Client.QueryResult.EndExecute TElement(对象来源:IAsyncResult asyncResultSystem.Data.Services.Client.DataServiceRequest.EndExecute TElement(对象来源，DataServiceContext上下文，IAsyncResult asyncResult) at1. endexecute (IAsyncResult System.Data.Services.Client.DataServiceQuery"asyncResult)(IAsyncResult ThreatModeler.Silverlight.ProjectWindow.b_ 05)在system . data . services . client . baseasyncresult . handleccompleted ()在System.Data.Services.Client.QueryResult.AsyncEndGetResponse (IAsyncResultasyncResult)System.Data.Services.Client.BaseAsyncResult灵活;c> _DisplayClass1.b_ 0 (IAsyncResultasyncResult)System.Net.Browser.ClientHttpWebRequest灵活;c> _DisplayClass1a.b__18(对象state2)System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(对象在System.Threading.ExecutionContext.Run(ExecutionContext . stateexecutionContext, ContextCallback, callback，对象状态，布尔值preserveSyncCtx)System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem ()threadpoolworkqueue . dispatch (System.Threading._ThreadPoolWaitCallback.PerformWaitCallback ()}

Answer 1

这对我很有效。为我服务

1. 在"Installed Templates"下选择"Data"，选择"XML File"。将文件命名为clientaccessppolicy .xml。
2. 在文件中输入如下内容:

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