TlbExp.exe error:This assembly is built by a runtime newer

We are moving part of our server to .net 4.0. We already did the move to Vs2010 as a first step but did not change the target framework of any project.

As a second ste开发者_Python百科p I'm moving a specific part of our server to target 4.0 so we can use some of the new functionality.

I've run into a problem when calling TLBexp.exe on a Class library DLL that targets 4.0. This DLL also references a lot of DLLs that target 2.0.

I get the error: TlbExp : error TX0000: Could not load file or assembly 'file:Library.dll' or one of its dependencies. This assembly is built by a runtime newer than the currently loaded runtime and cannot be loaded.

I am calling the TLBExp that comes with: Microsoft SDKs\Windows\v7.0A\bin\ In the command I call in the VS2010 command prompt I reference v4.0.30319 binaries (such as mscorlib.tlb)

Is running TLB on a 4.0 DLL that references 2.0 libraries allowed? If yes then any reason why I'm getting this error.

Here is the exact command call i use: "C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin\tlbexp.exe" /silent /win32 /tlbreference:"C:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.tlb" /tlbreference:"C:\Windows\Microsoft.NET\Framework\v4.0.30319\System.tlb" /tlbreference:"C:\Windows\Microsoft.NET\Framework\v4.0.30319\System.Windows.Forms.tlb" /tlbreference:"C:\Windows\system32\stdole2.tlb" C:\Dev\Library.dll

Thanks

I had an assembly targeting 4.0, that referenced another assembly which had a target framework of 3.5.

As a result, I was getting the same error on a "post build" step. By trial and error, I discovered that the version of TLBExp found in this folder: C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\bin\NETFX 4.0 Tools\ could generate the TLB file successfully.

HTH!

You can use the following path to TlbExp, which will be picked up automatically based on project framework version:

$(TargetFrameworkSDKToolsDirectory)\tlbexp.exe