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POProblem in Serializing Custom hierarchial Collection
 

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    <p>I had to populate a tree view for which i have made a custom collection<br> Here are the Classes of the custom collection </p> <pre><code>public class EntityBase : ObservableCollection&lt;object&gt; { private string name; public string Name { get { return name; } set { name = value; InvokePropertyChange(this, new PropertyChangedEventArgs("Name")); } } public event PropertyChangedEventHandler PropertyChanged; public void InvokePropertyChange(object sender, PropertyChangedEventArgs e) { if (PropertyChanged != null) { PropertyChanged(sender, e); } } } public class ParentX : EntityBase // Should be the root of my XML { } public class Parent : EntityBase { private ChildC _childC; public ChildC ChildC { get { return _childC; } set { _childC = value; } } } public class ChildA : EntityBase { } public class ChildB : EntityBase { } public class ChildC : EntityBase { private ObservableCollection&lt;ChildB&gt; children = new ObservableCollection&lt;ChildB&gt;(); public ObservableCollection&lt;ChildB&gt; Children { get { return children; } set { children = value; } } } </code></pre> <p>Here is the how i am filling the data in hierarchial order so that a heterogenious tree can be populated... </p> <pre><code>public class DataBase { public ObservableCollection&lt;object&gt; GetData() { ChildB childB1 = new ChildB { Name = "Parent 1 - ChildB 1" }; ChildB childB2 = new ChildB { Name = "Parent 1 - ChildB 2" }; ChildA childA1 = new ChildA { childB1, childB2 }; // ChildA will have ChildB objects as its child childA1.Name = "Parent 1 - ChildA 1"; ChildC childC = new ChildC{Name="CHildC"}; for (int i = 0; i &lt; 5; i++) { childC.Children.Add(new ChildB{Name="Pappu" + i}); // childC children Property will have childB Object } Parent parent1 = new Parent {childC, childA1}; // Parent class will have ChildC and ChildA as its child parent1.Name = "Parent1"; //Family 2 ParentX parentX=new ParentX{Name="Parent"}; parentX.Add(parent1); //ParentX will have Parent as its child return new ObservableCollection&lt;object&gt; { parentX }; } } </code></pre> <p>Here is the serialisation code that i am using..... </p> <pre><code>using (FileStream fileStream=new FileStream(@"D:\text.xml",FileMode.Create)) { XmlSerializer xmlSerializer = new XmlSerializer(typeof(ParentX), new Type[] { typeof(Parent), typeof(ChildA), typeof(ChildC), typeof(ChildB)}); if (data != null) xmlSerializer.Serialize(fileStream, data); } </code></pre> <p>I am stuck at this ..... It Does not serialize its gives the error.... </p> <pre><code>{"There was an error generating the XML document."} "The type HierarchialTreeView.Model.ChildC may not be used in this context." </code></pre> <p>Plz help I am stuck at this real bad<br> It was difficult to populate a Heterogenious treeView of the required type and now this happened</p> <p>Thanks Ne ways... Community has been very helpful :) </p> <p>Edit :<br> Inner Exception :<br> {"The type HierarchialTreeView.Model.ChildC may not be used in this context."}<br> Inner-inner exception = null<br> There is no more exceptions after this.... (inner inner inner ex)</p> <p>Stack Trace (In case someone needs) :</p> <pre><code>System.InvalidOperationException was unhandled Message=There was an error generating the XML document. Source=System.Xml StackTrace: at System.Xml.Serialization.XmlSerializer.Serialize(XmlWriter xmlWriter, Object o, XmlSerializerNamespaces namespaces, String encodingStyle, String id) at System.Xml.Serialization.XmlSerializer.Serialize(Stream stream, Object o, XmlSerializerNamespaces namespaces) at System.Xml.Serialization.XmlSerializer.Serialize(Stream stream, Object o) at HierarchialTreeView.MainWindow.Button_Click(Object sender, RoutedEventArgs e) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) at System.Windows.UIElement.RaiseEvent(RoutedEventArgs e) at System.Windows.Controls.Primitives.ButtonBase.OnClick() at System.Windows.Controls.Button.OnClick() at System.Windows.Controls.Primitives.ButtonBase.OnMouseLeftButtonUp(MouseButtonEventArgs e) at System.Windows.UIElement.OnMouseLeftButtonUpThunk(Object sender, MouseButtonEventArgs e) at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.ReRaiseEventAs(DependencyObject sender, RoutedEventArgs args, RoutedEvent newEvent) at System.Windows.UIElement.OnMouseUpThunk(Object sender, MouseButtonEventArgs e) at System.Windows.Input.MouseButtonEventArgs.InvokeEventHandler(Delegate genericHandler, Object genericTarget) at System.Windows.RoutedEventArgs.InvokeHandler(Delegate handler, Object target) at System.Windows.RoutedEventHandlerInfo.InvokeHandler(Object target, RoutedEventArgs routedEventArgs) at System.Windows.EventRoute.InvokeHandlersImpl(Object source, RoutedEventArgs args, Boolean reRaised) at System.Windows.UIElement.RaiseEventImpl(DependencyObject sender, RoutedEventArgs args) at System.Windows.UIElement.RaiseTrustedEvent(RoutedEventArgs args) at System.Windows.UIElement.RaiseEvent(RoutedEventArgs args, Boolean trusted) at System.Windows.Input.InputManager.ProcessStagingArea() at System.Windows.Input.InputManager.ProcessInput(InputEventArgs input) at System.Windows.Input.InputProviderSite.ReportInput(InputReport inputReport) at System.Windows.Interop.HwndMouseInputProvider.ReportInput(IntPtr hwnd, InputMode mode, Int32 timestamp, RawMouseActions actions, Int32 x, Int32 y, Int32 wheel) at System.Windows.Interop.HwndMouseInputProvider.FilterMessage(IntPtr hwnd, WindowMessage msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean&amp; handled) at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o) at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs) at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler) at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs) at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam) at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG&amp; msg) at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame) at System.Windows.Threading.Dispatcher.Run() at System.Windows.Application.RunDispatcher(Object ignore) at System.Windows.Application.RunInternal(Window window) at System.Windows.Application.Run(Window window) at System.Windows.Application.Run() at HierarchialTreeView.App.Main() at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args) at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args) at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly() at System.Threading.ThreadHelper.ThreadStart_Context(Object state) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx) at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at System.Threading.ThreadHelper.ThreadStart() InnerException: System.InvalidOperationException Message=The type HierarchialTreeView.Model.ChildC may not be used in this context. Source=System.Xml StackTrace: at System.Xml.Serialization.XmlSerializationWriter.WriteTypedPrimitive(String name, String ns, Object o, Boolean xsiType) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterParentX.Write1_Object(String n, String ns, Object o, Boolean isNullable, Boolean needType) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterParentX.Write1_Object(String n, String ns, Object o, Boolean isNullable, Boolean needType) at Microsoft.Xml.Serialization.GeneratedAssembly.XmlSerializationWriterParentX.Write2_ArrayOfAnyType(Object o) InnerException: </code></pre>
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    1. CODid someone get the Hook of this problem ????
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    2. COIn my experience, XMLSerializer likes to wrap exceptions with other exceptions at least 10 times over, but the inner-most exception nearly always gives an accurate description of the problem. Check the inner exception, inner-inner exceptions, and so on down the exception tree with your debugger.
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    3. CO@Juliet : Hi there, I tried your suggestion and that what i found.. I have edit my Question and added the information form my findings...also included Stacktrace if ne one needs..... i could not figure oue ne thing with that stack trace.... It would be really helpful if you could take out some time and look into this... thanks....
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