Error when using Windows Task Scheduler in C#

Question

I am using Windows Task Scheduler in my Visual C# application. I add the reference to C:\Windows\SysWOW64\taskschd.dll (on a 64-bit system), and Visual Studio creates a COM wrapper Interop.TaskScheduler.dll. Ths works fine on Windows 7. However, when
I run on Windows 8.1, I get the following error:
Unable to cast COM object of type 'System.__ComObject' to interface type 'TaskScheduler.IExecAction'.
This operation failed because the QueryInterface call on the COM component for the interface with IID
'{4C3D624D-FD6B-49A3-B9B7-09CB3CD3F047}' failed due to the following error:
No such interface supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
I noticed that on Windows 7, the above GUID exists in the registry under HKEY_CLASSES_ROOT\Interface, with the value "IExecAction". But on Windows 8.1, there is no such GUID, and no key with value "IExecAction". I use IExecAction
in my code.
When I develop on Windows 8.1, the program compiles, but at runtime I get the above error.

Answer 1

Hello tomszms,
Here is a blog related to this issue and the troubleshoot steps of his error is very useful for your case, so please check for it:
http://blogs.msdn.com/b/smondal/archive/2012/10/02/unable-to-cast-com-object-of-type-system-comobject-to-interface-type-microsoft-visualstudio-ole-interop-iserviceprovider.aspx
Please try use the same way to track the logs and then try use the regsvr32
on your Win 8 machine to re-register that dll and see the result.
Best regards,
Barry
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