Vista - WindowsFormIntegration.DLL problem after upgrading to Feb CTP

When I move mouse over the UIElement hosted in WinForm control, or call
UIElement.Focus(), a NullReferenceException will be thrown:

System.NullReferenceException occurred
Message="Object reference not set to an instance of an object."
Source="WindowsFormsIntegration"
StackTrace:
at
System.Windows.Forms.Integration.ElementHost.InputManager_PostProcessInput(Object
sender, ProcessInputEventArgs e)
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, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at System.Windows.Interop.HwndSource.InputFilterMessage(IntPtr hwnd,
Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr
wParam, IntPtr lParam, Boolean& handled)
at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
at
System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate
callback, Object args, Boolean isSingleParameter)
at System.Windows.Threading.ExceptionWrapper.TryCatchWhen(Object
source, Delegate callback, Object args, Boolean isSingleParameter, Delegate
catchHandler)
at System.Windows.Threading.Dispatcher.InvokeImpl(DispatcherPriority
priority, TimeSpan timeout, Delegate method, Object args, Boolean
isSingleParameter)
at System.Windows.Threading.Dispatcher.Invoke(DispatcherPriority
priority, Delegate method, Object arg)
at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg,
IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.UnsafeNativeMethods.CallWindowProc(IntPtr
wndProc, IntPtr hWnd, Int32 msg, IntPtr wParam, IntPtr lParam)
at System.Windows.Forms.NativeWindow.DefWndProc(Message& m)
at System.Windows.Forms.Control.DefWndProc(Message& m)
at System.Windows.Forms.Control.WmMouseMove(Message& m)
at System.Windows.Forms.Control.WndProc(Message& m)
at
System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message&
m)
at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd,
Int32 msg, IntPtr wparam, IntPtr lparam)
at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG&
msg)
at
System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32
reason, ApplicationContext context)
at
System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason,
ApplicationContext context)
at System.Windows.Forms.Application.Run(Form mainForm)
at PMS.Program.Main() in D:\WMS\src\App\PMS\Program.cs:line 43

Which WindowsFormsIntegration.dll are you using? I had a similar problem
when I upgraded one of my applications to the Feb. CTP, and I came across a
blog posting that the WindowsFormsIntegration.dll that shipped in the
Reference Assemblies directory was broken. The version that is working for
me is located on my system in C:\Program Files\Microsoft Visual Studio
8\Common7\IDE\Cider\ -- so, the build that is distributed with the VS XAML
designer. Should be 68KB in size, as opposed to the Reference Assemblies
build which is 88KB

"Lei Jiang" wrote:

> WindowsFormsIntegration.dll problem