C# 调用root.Shutdown（）后的Axiom framework NullReferenceException

所以我编写了自己的游戏类，初始化方式如下（顺便说一句，这是F而不是C）：

root

是构造函数中的第一个参数，因此它与第一个示例中的

engine

是同一个对象。以下是全部错误：

System.NullReferenceException was unhandled
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=Axiom
  StackTrace:
       at Axiom.Graphics.RenderTarget.Update(Boolean swapBuffers)
       at Axiom.Graphics.RenderSystem.UpdateAllRenderTargets(Boolean swapBuffers)
       at Axiom.Core.Root.UpdateAllRenderTargets()
       at Axiom.Core.Root.RenderOneFrame()
       at Axiom.Core.Root.StartRendering()
       at MiningGameTest.Game.RunGame() in H:\Projects\FSharp\MiningGameTest\MiningGameTest\Game.fs:line 22
       at MiningGameTest.Host.Axiom.Program.Main(String[] args) in h:\Projects\FSharp\MiningGameTest\MiningGameTest.Host.Axiom\Program.cs:line 14
       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.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()

内部异常：

还有一件事：我不确定这是否与此有关，但在项目启动时，我也立即收到了以下错误：

A first chance exception of type 'System.DllNotFoundException' occurred in FreeImageNET.dll
A first chance exception of type 'System.DllNotFoundException' occurred in OpenTK.dll
A first chance exception of type 'System.TypeInitializationException' occurred in OpenTK.dll
A first chance exception of type 'System.DllNotFoundException' occurred in OpenTK.dll
A first chance exception of type 'System.NullReferenceException' occurred in Axiom.dll

我是做错了什么，还是这是一个公理错误

---

PS：我在Windows 8和Visual Studio 2012 Professional下运行，使用OpenGL渲染系统。

你说“root”是构造函数的第一个参数-我们可以看到这种情况下的代码吗？它看起来是这样的：

类型游戏（root:root，window:window）=……

另外，请记住这是具有“default”的F#像上面这样的构造函数。它与C#有点不同，但它几乎只是一个构造函数，具有自动字段绑定到参数的功能。它们在您不需要任何特殊代码时使用。

System.NullReferenceException was unhandled
  HResult=-2147467261
  Message=Object reference not set to an instance of an object.
  Source=Axiom
  StackTrace:
       at Axiom.Graphics.RenderTarget.Update(Boolean swapBuffers)
       at Axiom.Graphics.RenderSystem.UpdateAllRenderTargets(Boolean swapBuffers)
       at Axiom.Core.Root.UpdateAllRenderTargets()
       at Axiom.Core.Root.RenderOneFrame()
       at Axiom.Core.Root.StartRendering()
       at MiningGameTest.Game.RunGame() in H:\Projects\FSharp\MiningGameTest\MiningGameTest\Game.fs:line 22
       at MiningGameTest.Host.Axiom.Program.Main(String[] args) in h:\Projects\FSharp\MiningGameTest\MiningGameTest.Host.Axiom\Program.cs:line 14
       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.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()

A first chance exception of type 'System.DllNotFoundException' occurred in FreeImageNET.dll
A first chance exception of type 'System.DllNotFoundException' occurred in OpenTK.dll
A first chance exception of type 'System.TypeInitializationException' occurred in OpenTK.dll
A first chance exception of type 'System.DllNotFoundException' occurred in OpenTK.dll
A first chance exception of type 'System.NullReferenceException' occurred in Axiom.dll