WinEventHook.Dispose exception when reloading an add-in?

[alainbryden]

Some new behaviour with the latest Intellisense version:

If I (e.g. accidentally) load my add-in while it's already loaded (which is admittedly undefined behaviour), Excel now crashes due to the following exception:

System.InvalidOperationException
Invoke or BeginInvoke cannot be called on a control until the window handle has been created.
   at System.Windows.Forms.Control.MarshaledInvoke(Control caller, Delegate method, Object[] args, Boolean synchronous)

If I attach a debugger, the call stack when it's thrown is:

 	System.Windows.Forms.Control.MarshaledInvoke(caller, method, args, synchronous)	Unknown
 	System.Windows.Forms.Control.Invoke(method, args)	Unknown
 	System.Windows.Forms.WindowsFormsSynchronizationContext.Send(d, state)	Unknown
>	ExcelDna.IntelliSense.WinEventHook.Dispose()	Unknown
 	ExcelDna.IntelliSense.UIMonitor.Dispose.AnonymousMethod__19_0(<p0>)	Unknown
 	ExcelDna.IntelliSense.SingleThreadSynchronizationContext.RunOnCurrentThread()	Unknown
 	System.Threading.ExecutionContext.RunInternal(executionContext, callback, state, preserveSyncCtx) Line 954	C#
 	System.Threading.ExecutionContext.Run(executionContext, callback, state, preserveSyncCtx) Line 902	C#
 	System.Threading.ExecutionContext.Run(executionContext, callback, state) Line 891	C#
 	System.Threading.ThreadHelper.ThreadStart() Line 111	C#
 	[Native to Managed Transition]	

[alainbryden]

Side note, I think if you added the pdb to your Nuspec, it would allow us to debug it when referencing the Nuget package:

<file src="..\..\Source\ExcelDna.IntelliSense\bin\Release\ExcelDna.IntelliSense.dll" target="lib\net40\ExcelDna.IntelliSense.dll" />
<file src="..\..\Source\ExcelDna.IntelliSense\bin\Release\ExcelDna.IntelliSense.pdb" target="lib\net40\ExcelDna.IntelliSense.pdb" />

[govert]

OK thanks - I'll try to track down the problem with the unload.