在window phone sdk 8.0中创建窗口手机应用程序时出错 [英] error solve when create window phone apps in window phone sdk 8.0

问题描述

不显示设计窗口电话



错误：=发生未处理的异常

 System.NullReferenceException 
对象引用未设置为对象的实例。 
 at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion（NestedCallContext nestedCallContext，BlockingCall call，WaitHandle timeoutSignal）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOutSynchronous（Action action， Int32 targetApartmentId，WaitHandle aborted，WaitHandle timeoutSignal）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOut（Action action，Int32 targetApartmentId，WaitHandle aborted，CallSynchronizationMode syncMode，WaitHandle timeoutSignal）
 at Microsoft。 Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut [TValue]（RemoteHandle`1 targetObject，Action action，CallSynchronizationMode syncMode）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut [TResult，TValue]（ RemoteHandle`1 targetObject，Func`2 func，CallSynchronizationMode syncMode）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerServi ce.CreateDesignerImpl（IHostSourceItem item，IHostTextEditor editor，RemoteCancellationToken remoteCancelToken）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService。<  >  c__DisplayClass12。<   Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner  >  b__11（RemoteCancellationToken remoteToken）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.CallWithCancellation [TResult]（CancellationToken cancelToken，Func 2 func
 at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner（IHostSourceItem item，IHostTextEditor editor，CancellationToken cancelToken）
 at Microsoft.Expression.DesignHost .IsolatedDesignerService.IsolatedDesignerView.CreateDesignerV iewInfo（CancellationToken cancelToken）
 
 System.NullReferenceException 
对象引用未设置为对象的实例。 
 
服务器堆栈跟踪：
 at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion（NestedCallContext nestedCallContext，BlockingCall call，WaitHandle timeoutSignal）
 at Microsoft.Expression.DesignHost .Isolation.Remoting.STAMarshaler.MarshalIn（Action action，Int32 targetApartmentId）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalIn（IRemoteObject targetObject，Action action）
 at Microsoft.Expression.DesignHost .Isolation.Remoting.ThreadMarshaler.MarshalIn [TResult]（IRemoteObject targetObject，Func`1 func）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner （IRemoteHostSourceItem remoteItem，IRemoteHostTextEditor remoteEditor，IRemoteCancellationToken remoteToken）
 at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage（IntPtr md，Object [] args，Object s erver，Object []& outArgs）
 at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage（IMessage msg）
 
异常重新抛出[0]：
在System.Runtime.Remoting.Proxies。 RealProxy.HandleReturnMessage（IMessage reqMsg，IMessage retMsg）
 at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke（MessageData& msgData，Int32 type）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService .CreateDesigner（IRemoteHostSourceItem remoteItem，IRemoteHostTextEditor remoteEditor，IRemoteCancellationToken cancelToken）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService。<  >  c__DisplayClass8。<   CreateDesignerImpl  >  b__6（IRemoteDesignerService d）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler。<  >  c__DisplayClass4`2。<   MarshalOut  >  b__3（）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call。 InvokeWorker（）
 
 System.NullReferenceException 
对象引用未设置为对象的实例。 
 at Microsoft.Expression.Platform.PlatformService.PlatformEntry.get_PlatformCreator（）
 at Microsoft.Expression.Platform.PlatformService.GetPlatformCreator（String frameworkSpec）
 at Microsoft.Expression.Platform.PlatformService.IsCompatibleFramework （FrameworkName hostFramework，FrameworkName guestFramework）
 at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetProjectContext（IHostProject project，IPlatform platform，Boolean create）
 at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetSourceItemContext（ IHostSourceItem sourceItem）
 at Microsoft.Expression.DesignSurface.DesignerService.CreateDesigner（IHostSourceItem item，IHostTextEditor editor，CancellationToken cancelToken）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService。<  >  c__DisplayClass10。<  >  c__DisplayClass12。<   Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner  >  b__f（CancellationToken cancelToken）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.CallWithCancellation [TResult]（IRemoteCancellationToken remoteToken， Func`2 func）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService。<  >  c__DisplayClass10。<   Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner  < span class =code-keyword>>  b__e（）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler。<  >  c__DisplayClass16`1。<   MarshalIn  >  b__15（）
 at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call.InvokeWorker（）

解决方案

< blockquote>答案很简单！



引发此错误的对象或代码部分为空值。但是代码的一部分需要一个值来处理，而你的应用程序传递一个空值，导致.NET跳入并导致异常并终止进程。



尝试将该代码块包装在 try catch 中，或者使用 if else block。



我会使用if else block

  if （someVariable！=  null ）{
  //  在此处执行该代码块..  
}  else  {
  //  报告用户，关于错误，告诉他值为空 
} 

这很方便，您可以在应用程序中控制此空引用异常。它只是意味着该变量具有无值来处理。

NOT DISPLAY DESIGN WINDOW PHONE

Error:="an unhandled exception has occured"

System.NullReferenceException
Object reference not set to an instance of an object.
   at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOutSynchronous(Action action, Int32 targetApartmentId, WaitHandle aborted, WaitHandle timeoutSignal)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalOut(Action action, Int32 targetApartmentId, WaitHandle aborted, CallSynchronizationMode syncMode, WaitHandle timeoutSignal)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut[TValue](RemoteHandle`1 targetObject, Action action, CallSynchronizationMode syncMode)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalOut[TResult,TValue](RemoteHandle`1 targetObject, Func`2 func, CallSynchronizationMode syncMode)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.CreateDesignerImpl(IHostSourceItem item, IHostTextEditor editor, RemoteCancellationToken remoteCancelToken)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass12.<Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner>b__11(RemoteCancellationToken remoteToken)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.CallWithCancellation[TResult](CancellationToken cancelToken, Func`2 func)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.Microsoft.Expression.DesignHost.IDesignerService.CreateDesigner(IHostSourceItem item, IHostTextEditor editor, CancellationToken cancelToken)
   at Microsoft.Expression.DesignHost.IsolatedDesignerService.IsolatedDesignerView.CreateDesignerViewInfo(CancellationToken cancelToken)

System.NullReferenceException
Object reference not set to an instance of an object.

Server stack trace:
   at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.WaitForCompletion(NestedCallContext nestedCallContext, BlockingCall call, WaitHandle timeoutSignal)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.MarshalIn(Action action, Int32 targetApartmentId)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalIn(IRemoteObject targetObject, Action action)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.MarshalIn[TResult](IRemoteObject targetObject, Func`1 func)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(IRemoteHostSourceItem remoteItem, IRemoteHostTextEditor remoteEditor, IRemoteCancellationToken remoteToken)
   at System.Runtime.Remoting.Messaging.StackBuilderSink._PrivateProcessMessage(IntPtr md, Object[] args, Object server, Object[]& outArgs)
   at System.Runtime.Remoting.Messaging.StackBuilderSink.SyncProcessMessage(IMessage msg)

Exception rethrown at [0]:
   at System.Runtime.Remoting.Proxies.RealProxy.HandleReturnMessage(IMessage reqMsg, IMessage retMsg)
   at System.Runtime.Remoting.Proxies.RealProxy.PrivateInvoke(MessageData& msgData, Int32 type)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner(IRemoteHostSourceItem remoteItem, IRemoteHostTextEditor remoteEditor, IRemoteCancellationToken cancelToken)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.LocalDesignerService.<>c__DisplayClass8.<CreateDesignerImpl>b__6(IRemoteDesignerService d)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.<>c__DisplayClass4`2.<MarshalOut>b__3()
   at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call.InvokeWorker()

System.NullReferenceException
Object reference not set to an instance of an object.
   at Microsoft.Expression.Platform.PlatformService.PlatformEntry.get_PlatformCreator()
   at Microsoft.Expression.Platform.PlatformService.GetPlatformCreator(String frameworkSpec)
   at Microsoft.Expression.Platform.PlatformService.IsCompatibleFramework(FrameworkName hostFramework, FrameworkName guestFramework)
   at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetProjectContext(IHostProject project, IPlatform platform, Boolean create)
   at Microsoft.Expression.DesignSurface.Project.ProjectContextManager.GetSourceItemContext(IHostSourceItem sourceItem)
   at Microsoft.Expression.DesignSurface.DesignerService.CreateDesigner(IHostSourceItem item, IHostTextEditor editor, CancellationToken cancelToken)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.<>c__DisplayClass10.<>c__DisplayClass12.<Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner>b__f(CancellationToken cancelToken)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.CallWithCancellation[TResult](IRemoteCancellationToken remoteToken, Func`2 func)
   at Microsoft.Expression.DesignHost.Isolation.Remoting.RemoteDesignerService.<>c__DisplayClass10.<Microsoft.Expression.DesignHost.Isolation.Remoting.IRemoteDesignerService.CreateDesigner>b__e()
   at Microsoft.Expression.DesignHost.Isolation.Remoting.ThreadMarshaler.<>c__DisplayClass16`1.<MarshalIn>b__15()
   at Microsoft.Expression.DesignHost.Isolation.Remoting.STAMarshaler.Call.InvokeWorker()

解决方案

The answer is simple!

The object or the part of code that is raising this error is of null value. But the part of code, requires a value to work on whereas your application is passing a null value so causing the .NET to jump in and cause an exception and terminate the process.

Try wrapping that code block inside a try catch, or use if else block.

I would use if else block as

if(someVariable != null) {
   // execute that code block here..
} else {
   // report the user, about the error, tell him value is null
}

This comes handy and you can control this null reference exception in your application. It just means that the variable has no value to work on.

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