Question

我正在尝试直接创建HwndSource来创建一个窗口。目前我有一个替代解决方案 - 继承自Window类，但我只是好奇我的HwndSource实现有什么问题。由于Window在其核心使用HwndSource，我觉得应该有办法。

以下是我的代码的简化版本：

private void ButtonBase_OnClick(object sender, RoutedEventArgs e)
{
    HwndSource wndPopup = new HwndSource(0, 0x12cf0000/*WS_VISIBLE|WS_OVERLAPPEDWINDOW*/, 0, 10, 10, 500, 500, "Test", IntPtr.Zero);
    wndPopup.RootVisual = new Rectangle() { Fill = Brushes.Red, Width = 100, Height = 100 };
}

窗口按预期创建，但在我关闭它（Alt + F4或关闭图标）并将鼠标悬停在我的主窗口上之后，很多消息都会出现在调试器中：

抛出异常：WindowsBase.dll中的“System.ComponentModel.Win32Exception”

异常详情如下：

Exception thrown: 'System.ComponentModel.Win32Exception' in WindowsBase.dll
Additional information: Invalid window handle

堆栈追踪：

 WindowsBase.dll!MS.Win32.UnsafeNativeMethods.GetWindowText(System.Runtime.InteropServices.HandleRef, System.Text.StringBuilder, int)
 PresentationCore.dll!System.Windows.Automation.Peers.GenericRootAutomationPeer.GetNameCore()
 PresentationCore.dll!System.Windows.Automation.Peers.AutomationPeer.UpdateSubtree()
 PresentationCore.dll!System.Windows.ContextLayoutManager.fireAutomationEvents()
 PresentationCore.dll!System.Windows.ContextLayoutManager.UpdateLayout()
 PresentationCore.dll!System.Windows.ContextLayoutManager.UpdateLayoutCallback(object)
 PresentationCore.dll!System.Windows.Media.MediaContext.InvokeOnRenderCallback.DoWork()
 PresentationCore.dll!System.Windows.Media.MediaContext.FireInvokeOnRenderCallbacks()
 PresentationCore.dll!System.Windows.Media.MediaContext.RenderMessageHandlerCore(object)
 PresentationCore.dll!System.Windows.Media.MediaContext.RenderMessageHandler(object)
 WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, object, int)
 WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object, System.Delegate, object, int, System.Delegate)
 WindowsBase.dll!System.Windows.Threading.DispatcherOperation.InvokeImpl()
 WindowsBase.dll!System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(object)
 mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, object, bool)
 mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, object, bool)
 mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, object)
 WindowsBase.dll!System.Windows.Threading.DispatcherOperation.Invoke()
 WindowsBase.dll!System.Windows.Threading.Dispatcher.ProcessQueue()
 WindowsBase.dll!System.Windows.Threading.Dispatcher.WndProcHook(System.IntPtr, int, System.IntPtr, System.IntPtr, ref bool)
 WindowsBase.dll!MS.Win32.HwndWrapper.WndProc(System.IntPtr, int, System.IntPtr, System.IntPtr, ref bool)
 WindowsBase.dll!MS.Win32.HwndSubclass.DispatcherCallbackOperation(object)
 WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, object, int)
 WindowsBase.dll!System.Windows.Threading.ExceptionWrapper.TryCatchWhen(object, System.Delegate, object, int, System.Delegate)
 WindowsBase.dll!System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, object, int)
 WindowsBase.dll!MS.Win32.HwndSubclass.SubclassWndProc(System.IntPtr, int, System.IntPtr, System.IntPtr)
 [Native to Managed Transition]    
 [Managed to Native Transition]    
 WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
 WindowsBase.dll!System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame)
 PresentationFramework.dll!System.Windows.Application.RunDispatcher(object)
 PresentationFramework.dll!System.Windows.Application.RunInternal(System.Windows.Window)
 PresentationFramework.dll!System.Windows.Application.Run(System.Windows.Window)
 PresentationFramework.dll!System.Windows.Application.Run()
 WpfCombox.exe!WpfCombox.App.Main()
 [Native to Managed Transition]    
 [Managed to Native Transition]    
 mscorlib.dll!System.AppDomain.ExecuteAssembly(string, System.Security.Policy.Evidence, string[])
 Microsoft.VisualStudio.HostingProcess.Utilities.dll!Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
 mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context(object)
 mscorlib.dll!System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, object, bool)
 mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, object, bool)
 mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, object)
 mscorlib.dll!System.Threading.ThreadHelper.ThreadStart()

因此，错误发生在框架代码的深处。

我尝试填充其他属性或向Disposed处理程序添加清理，但这对结果没有影响。如果我没有设置RootVisual，则没有错误（当然，这不是一个选项）。

我缺少什么想法？

直接创建HwndSource

0 个答案: