Silverlight5アプリケーション/.NET4.0アプリケーションでWCFデータサービスを利用しようとしています。サービスを手動で照会すると、AtomフィードとしてWebブラウザーにデータが表示されます。
ただし、標準的なアプローチでデータをクエリしようとすると、次のエラーが発生します。
{System.Security.SecurityException:セキュリティエラー。System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)at System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)at System.Data.Services.Client.QueryResult.AsyncEndGetResponse(IAsyncResult asyncResult)}
内部例外はnullです。したがって、意味のある情報はまだ利用できません。
私のコード
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
}
}
}
完全なスタックトレース(スタックトレース1):
System.InvalidOperationExceptionはユーザーコードによって処理されませんでしたMessage=この要求の処理中にエラーが発生しました。StackTrace:at System.Data.Services.Client.BaseAsyncResult.EndExecute [T](Object source、String method、IAsyncResult asyncResult)at System.Data.Services.Client.QueryResult.EndExecute [TElement](Object source、IAsyncResult asyncResult)at System.Data.Services.Client.DataServiceRequest.EndExecute [TElement](Object source、DataServiceContext context、IAsyncResult asyncResult)at System.Data.Services.Client.DataServiceQuery`1.EndExecute(IAsyncResult asyncResult)at ThreatModeler.Silverlight.ProjectWindow.OnCategoriesFecthComplete (IAsyncResult ar)System.Data.Services.Client.BaseAsyncResult.HandleCompleted()atSystem.Data.Services.Client.QueryResult。DisplayClass1.b _0(IAsyncResult asyncResult)atSystem.Net.Browser.ClientHttpWebRequest。<>c_ DisplayClass1a.b_18(Object state2)at System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)at System.Threading.ExecutionContext.Run(ExecutionContextexecutionContext、ContextCallback callback、Object state、BooleanpreserveSyncCtx)at System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem .ExecuteWorkItem()at System.Threading.ThreadPoolWorkQueue.Dispatch()at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()InnerException:System.Security.SecurityExceptionメッセージ=セキュリティエラー。StackTrace:System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)at System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)atSystem.Data.Services.Client。
完全なスタックトレース(スタックトレース#02)
{System.InvalidOperationException:このリクエストの処理中にエラーが発生しました。---> System.Security.SecurityException:セキュリティエラー。System.Net.Browser.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)at System.Data.Services.Http.ClientHttpWebRequest.EndGetResponse(IAsyncResult asyncResult)at System.Data.Services.Client.QueryResult.AsyncEndGetResponse(IAsyncResult asyncResult)---終了内部例外スタックトレースの---System.Data.Services.Client.BaseAsyncResult.EndExecute[T](Object source、String method、IAsyncResult asyncResult)at System.Data.Services.Client.QueryResult.EndExecute [TElement](Object source、IAsyncResult asyncResult)at System.Data.Services.Client.DataServiceRequest.EndExecute [TElement](Object source、DataServiceContext context、0(IAsyncResult s)at System.Data.Services.Client.BaseAsyncResult.HandleCompleted()at System.Data.Services.Client.QueryResult.AsyncEndGetResponse(IAsyncResult asyncResult)atSystem.Data.Services.Client.BaseAsyncResult。<>c _DisplayClass1 .b_ 0(IAsyncResult asyncResult)atSystem.Net.Browser.ClientHttpWebRequest。<>cSystem.Threading.QueueUserWorkItemCallback.System.ThreadingのSystem.Threading.QueueUserWorkItemCallback.WaitCallback_Context(Object state)の_DisplayClass1a.b__18(Object state2) .IThreadPoolWorkItem.ExecuteWorkItem()at System.Threading.ThreadPoolWorkQueue.Dispatch()at System.Threading._ThreadPoolWaitCallback.PerformWaitCallback()}