Windows phone 7 windows phone导航配方异常

有人能帮我解决这个问题吗？我正在使用我的应用程序中提供的导航配方。

这是我得到的一个例外：

Exception message: Type 'System.Windows.Media.ImageSource' cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute.
Stack trace:    at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.ThrowInvalidDataContractException(String message, Type type)
   at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.CreateDataContract(Int32 id, RuntimeTypeHandle typeHandle, Type type)
   at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.GetDataContractSkipValidation(Int32 id, RuntimeTypeHandle typeHandle, Type type)
   at System.Runtime.Serialization.DataContract.GetDataContract(RuntimeTypeHandle typeHandle, Type type, SerializationMode mode)
   at System.Runtime.Serialization.DataContract.GetDataContract(Type type)
   at System.Runtime.Serialization.ClassDataContract.ClassDataContractCriticalHelper..ctor(Type type)
   at System.Runtime.Serialization.ClassDataContract..ctor(Type type)
   at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.CreateDataContract(Int32 id, RuntimeTypeHandle typeHandle, Type type)
   at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.GetDataContractSkipValidation(Int32 id, RuntimeTypeHandle typeHandle, Type type)
   at System.Runtime.Serialization.DataContract.GetDataContract(RuntimeTypeHandle typeHandle, Type type, SerializationMode mode)
   at System.Runtime.Serialization.DataContract.GetDataContract(Type type)
   at System.Runtime.Serialization.ClassDataContract.ClassDataContractCriticalHelper..ctor(Type type)
   at System.Runtime.Serialization.ClassDataContract..ctor(Type type)
   at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.CreateDataContract(Int32 id, RuntimeTypeHandle typeHandle, Type type)
   at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.GetDataContractSkipValidation(Int32 id, RuntimeTypeHandle typeHandle, Type type)
   at System.Runtime.Serialization.DataContract.GetDataContract(RuntimeTypeHandle typeHandle, Type type, SerializationMode mode)
   at System.Runtime.Serialization.DataContract.GetDataContract(Type type)
   at System.Runtime.Serialization.DataMember.CriticalHelper.get_MemberTypeContract()
   at System.Runtime.Serialization.XmlFormatWriter.WriteMember(SerializingObject serObj, Int32 memberIndex, ClassDataContract derivedMostClassContract)
   at System.Runtime.Serialization.XmlFormatWriter.WriteClass(CallStackElement`1 callStackElement)
   at System.Runtime.Serialization.XmlFormatWriter.Serialize(XmlObjectSerializerWriteContext context)
   at System.Runtime.Serialization.XmlFormatWriter.InitializeCallStack(XmlWriterDelegator xmlWriterDel, Object obj, XmlObjectSerializerWriteContext writeContext, DataContract contract)
   at System.Runtime.Serialization.CollectionDataContract.WriteXmlValue(XmlWriterDelegator xmlWriter, Object obj, XmlObjectSerializerWriteContext context)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)
   at System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType(DataContract dataContract, XmlWriterDelegator xmlWriter, Object obj, RuntimeTypeHandle declaredTypeHandle)
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent(XmlWriterDelegator writer, Object graph)
   at System.Runtime.Serialization.DataContractSerializer.InternalWriteObject(XmlWriterDelegator writer, Object graph)
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions(XmlWriterDelegator writer, Object graph)
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObject(XmlDictionaryWriter writer, Object graph)
   at System.Runtime.Serialization.XmlObjectSerializer.WriteObject(Stream stream, Object graph)
   at Microsoft.Phone.Shell.StreamPersister.Serialize(IDictionary`2 dictionary, IEnumerable`1 knownTypes)
   at Microsoft.Phone.Shell.StreamPersister.Save(ShellPage shellPage, String key, IDictionary`2 dictionary, IEnumerable`1 knownTypes)
   at Microsoft.Phone.Controls.PhoneApplicationPage.InternalOnNavigatedFrom(NavigationEventArgs e)
   at System.Windows.Navigation.NavigationService.RaiseNavigated(Object content, Uri uri, NavigationMode mode, Boolean isNavigationInitiator, PhoneApplicationPage existingContentPage, PhoneApplicationPage newContentPage)
   at System.Windows.Navigation.NavigationService.CompleteNavigation(DependencyObject content, NavigationMode mode)
   at System.Windows.Navigation.NavigationService.ContentLoader_BeginLoad_Callback(IAsyncResult result)
   at System.Windows.Navigation.PageResourceContentLoader.BeginLoad_OnUIThread(AsyncCallback userCallback, PageResourceContentLoaderAsyncResult result)
   at System.Windows.Navigation.PageResourceContentLoader.<>c__DisplayClass4.<BeginLoad>b__0(Object args)
   at System.Reflection.RuntimeMethodInfo.InternalInvoke(RuntimeMethodInfo rtmi, Object obj, BindingFlags invokeAttr, Binder binder, Object parameters, CultureInfo culture, Boolean isBinderDefault, Assembly caller, Boolean verifyAccess, StackCrawlMark& stackMark)
   at System.Reflection.RuntimeMethodInfo.InternalInvoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, StackCrawlMark& stackMark)
   at System.Reflection.MethodBase.Invoke(Object obj, Object[] parameters)
   at System.Delegate.DynamicInvokeOne(Object[] args)
   at System.MulticastDelegate.DynamicInvokeImpl(Object[] args)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.Dispatch(DispatcherPriority priority)
   at System.Windows.Threading.Dispatcher.OnInvoke(Object context)
   at System.Windows.Hosting.CallbackCookie.Invoke(Object[] args)
   at System.Windows.RuntimeHost.ManagedHost.InvokeDelegate(IntPtr pHandle, Int32 nParamCount, ScriptParam[] pParams, ScriptParam& pResult)

Source page: /Views/MainPage.xaml

异常消息：无法序列化类型“System.Windows.Media.ImageSource”。考虑使用DATACONTractAttor属性对其进行标记，并标记要使用DATAMEMBAREATE属性序列化的所有成员。
堆栈跟踪：在System.Runtime.Serialization.DataContract.DataContractCriticalHelper.ThrowInvalidDataContractException（字符串消息，类型）
at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.CreateDataContract（Int32 id，RuntimeTypeHandle-typeHandle，Type-Type）
在System.Runtime.Serialization.DataContract.DataContractCriticalHelper.GetDataContractSkipValidation（Int32 id，RuntimeTypeHandle，TypeType）
在System.Runtime.Serialization.DataContract.GetDataContract（RuntimeTypeHandle-typeHandle，Type，SerializationMode模式）
at System.Runtime.Serialization.DataContract.GetDataContract（类型）
at System.Runtime.Serialization.ClassDataContract.ClassDataContractCriticalHelper..ctor（类型）
在System.Runtime.Serialization.ClassDataContract..ctor（类型）
at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.CreateDataContract（Int32 id，RuntimeTypeHandle-typeHandle，Type-Type）
在System.Runtime.Serialization.DataContract.DataContractCriticalHelper.GetDataContractSkipValidation（Int32 id，RuntimeTypeHandle，TypeType）
在System.Runtime.Serialization.DataContract.GetDataContract（RuntimeTypeHandle-typeHandle，Type，SerializationMode模式）
at System.Runtime.Serialization.DataContract.GetDataContract（类型）
at System.Runtime.Serialization.ClassDataContract.ClassDataContractCriticalHelper..ctor（类型）
在System.Runtime.Serialization.ClassDataContract..ctor（类型）
at System.Runtime.Serialization.DataContract.DataContractCriticalHelper.CreateDataContract（Int32 id，RuntimeTypeHandle-typeHandle，Type-Type）
在System.Runtime.Serialization.DataContract.DataContractCriticalHelper.GetDataContractSkipValidation（Int32 id，RuntimeTypeHandle，TypeType）
在System.Runtime.Serialization.DataContract.GetDataContract（RuntimeTypeHandle-typeHandle，Type，SerializationMode模式）
at System.Runtime.Serialization.DataContract.GetDataContract（类型）
在System.Runtime.Serialization.DataMember.CriticalHelper.get_MemberTypeContract（）中
at System.Runtime.Serialization.XmlFormatWriter.WriteMember（SerializingObject serObj、Int32 memberIndex、ClassDataContract-derivedMostClassContract）
在System.Runtime.Serialization.XmlFormatWriter.WriteClass（CallStackElement`1 CallStackElement）中
在System.Runtime.Serialization.XmlFormatWriter.Serializate（XmlObjectSerializerWriteContext上下文）上
在System.Runtime.Serialization.XmlFormatWriter.InitializeCallStack（XmlWriterDelegator xmlWriterDel、对象obj、XmlObjectSerializerWriteContext writeContext、DataContract）
在System.Runtime.Serialization.CollectionDataContract.WriteXmlValue（XmlWriterDelegator xmlWriter、对象obj、XmlObjectSerializerWriteContext上下文）
在System.Runtime.Serialization.XmlObjectSerializerWriteContext.WriteDataContractValue（DataContract DataContract，XmlWriterDelegator xmlWriter，Object obj，RuntimeTypeHandle declaredTypeHandle）
在System.Runtime.Serialization.XmlObjectSerializerWriteContext.SerializeWithoutXsiType（DataContract DataContract，XmlWriterDelegator xmlWriter，Object obj，RuntimeTypeHandle declaredTypeHandle）
在System.Runtime.Serialization.DataContractSerializer.InternalWriteObjectContent（XmlWriterDelegator编写器，对象图）
在System.Runtime.Serialization.DataContractSerializer.InternalWriteObject（XmlWriterDelegator编写器，对象图）
在System.Runtime.Serialization.XmlObjectSerializer.WriteObjectHandleExceptions（XmlWriterDelegator编写器，对象图）
在System.Runtime.Serialization.XmlObjectSerializer.WriteObject（XmlDictionaryWriter编写器，对象图）
在System.Runtime.Serialization.XmlObjectSerializer.WriteObject（流，对象图）
在Microsoft.Phone.Shell.StreamPersister.Serialize（IDictionary`2 dictionary，IEnumerable`1 knownTypes）
在Microsoft.Phone.Shell.StreamPersister.Save（ShellPage ShellPage，字符串键，IDictionary`2字典，IEnumerable`1 knownTypes）
位于Microsoft.Phone.Controls.PhoneApplicationPage.InternalOnNavigatedFrom（NavigationEventArgs e）
在System.Windows.Navigation.NavigationService.RaiseNavigated（对象内容、Uri、NavigationMode模式、布尔值isNavigationInitiator、PhoneApplicationPage existingContentPage、PhoneApplicationPage newContentPage）
位于System.Windows.Navigation.NavigationService.CompleteNavigation（依赖对象内容，导航模式）
在System.Windows.Navigation.NavigationService.ContentLoader\u BeginLoad\u回调中（IAsyncResult结果）
在System.Windows.Navigation.PageResourceContentLoader.BeginLoad\u OniThread（异步回调用户回调，PageResourceContentLoaderAsyncResult结果）
在System.Windows.Navigation.PageResourceContentLoader.c__DisplayClass4.b__0（对象参数）中
在System.Reflection.RuntimeMethodInfo.InternalInvoke（RuntimeMethodInfo rtmi、对象obj、BindingFlags invokeAttr、绑定器绑定器、对象参数、CultureInfo区域性、布尔值isBinderDefault、程序集调用者、布尔值验证访问、堆栈爬网标记和堆栈标记）
位于System.Reflection.RuntimeMethodInfo.InternalInvoke（对象obj、BindingFlags invokeAttr、绑定绑定器、对象[]参数、CultureInfo区域性、StackScrawMark和stackMark）
在System.Reflection.MethodBase.Invoke（对象obj，对象[]参数）处
位于System.Delegate.DynamicInvokeOne（对象[]args）
位于System.MulticastDelegate.DynamicInvokeImpl（对象[]args）
在System.Windows.Threading.DispatcherOperation.Invoke（）中
在System.Windows.Threading.Dispatcher.Dispatch中（DispatcherPriority优先级）
在System.Windo