C# 4.0 OperationException:处理时出错 此请求。-->System.Security.SecurityException:安全错误。 在System.Net.Browser.ClientHttpWebRequest.EndGetResponse（IAsyncResult）中 异步结果）在 System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse（IAsyncResult 异步结果）在 System.Data.Services.Client.QueryResult.AsyncEndGetResponse（IAsyncResult asyncResult）--内部异常堆栈跟踪的结束---at System.Data.Services.Client.BaseAsyncResult.EndExecute[T]（对象 源、字符串方法、IAsyncResult异步结果）位于 System.Data.Services.Client.QueryResult.EndExecute[TElement]（对象 源，IAsyncResult（异步结果）位于 System.Data.Services.Client.DataServiceRequest.EndExecute[TElement]（对象 源，DataServiceContext上下文，IAsyncResult asyncResult）位于 System.Data.Services.Client.DataServiceQuery`1.EndExecute（IAsyncResult 异步结果）在 ThreatModeler.Silverlight.ProjectWindow.b_0（IAsyncResult s） 位于System.Data.Services.Client.BaseAsyncResult.HandleCompleted（）处 在 System.Data.Services.Client.QueryResult.AsyncEndGetResponse（IAsyncResult 异步结果）在 System.Data.Services.Client.BaseAsyncResult.c_DisplayClass1.b_0（IAsyncResult 异步结果）在 System.Net.Browser.ClientHttpWebRequest.c_DisplayClass1a.b_u18（对象 （2）在 System.Threading.QueueUserWorkItemCallback.WaitCallback\u上下文（对象 在System.Threading.ExecutionContext.Run（ExecutionContext executionContext、ContextCallback回调、对象状态、布尔值 在 System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem（） 位于System.Threading.ThreadPoolWorkQueue.Dispatch（）的 System.Threading.\u ThreadPoolWaitCallback.PerformWaitCallback（）}

这对我有用。为我效劳

选择已安装模板下的数据，然后选择XML文件。将文件命名为clientaccesspolicy.xml

为文件输入以下内容：

---

这对我有用。为我效劳

选择已安装模板下的数据，然后选择XML文件。将文件命名为clientaccesspolicy.xml

为文件输入以下内容：

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
        }

    }

<?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>