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Reference to Microsoft.SharePoint.Publishing not working (GAC issue?)

Posted on 2009-03-31
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Last Modified: 2012-05-06
In a WebPart that I am creating I load a User Control using LoadControl() -- this User Control makes use of some of the objects defined in Microsoft.SharePoint.Publishing. However...

After loading the control using LoadControl() (with the reference):
The type or namespace name 'Publishing' does not exist in the namespace 'Microsoft.SharePoint' (are you missing an assembly reference?)

The first time I saw this error I knew immediately that I had forgotten to include the reference in my wrapper web part. After including it & rebuilding/deploying I still got this error. I then decided to try and manually copy my solution to the GAC (with the reference). The following is what resulted:

Exception When Trying To Copy My Solution To GAC (using wspbuilder):
System.BadImageFormatException: The module was expected to contain an assembly manifest (Exception from HRESULT: 0x80131018)
at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
at System.GACManagedAccess.AssemblyCache.InstallAssembly(String assemblyPath, InstallReference reference, AssemblyCommitFlag flags)
...

If I remove the assembly reference to Microsoft.Sharepoint.Publishing I can copy to the GAC with NO problem . What could be causing this? Is my dll corrupt? If it is how do I repair/replace it? Is there a way to include the reference in my user control? Am I missing something obvious? I am at a loss here.

I've tried changing the targets to x86 and x64, but currently it's on Any CPU. The workstation is a 64bit machine running x64 MOSS.

Note: One thing I have noticed is that the Publishing DLL a different solution is referencing is not located in the GAC and has a modified/create date of about 6 months prior to the version in the GAC. They both have the same version numbers and are exactly the same size, however. I have tried referencing this DLL instead of the GAC'd one, but with no luck or even a different outcome.
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Question by:dicksmithauto
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Accepted Solution

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MrClyfar earned 250 total points
ID: 24031459
Hi there.
From experience, when I've referenced the Microsoft.SharEPoint.Publishing DLL, I usually reference it from here:
C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\isapi
I've never referenced this DLL in the GAC. You could try using the DLL from this location instead.
Cheers.
Jas.
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Expert Comment

by:EIT-Midmark
ID: 24861991
That worked for me.  Thanks for the information.
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