.NET Framework 4.0 mysteriously loses track of System.EnterpriseServices

Posted by Lorin Thwaits on Geeks with Blogs See other posts from Geeks with Blogs or by Lorin Thwaits
Published on Sun, 21 Mar 2010 12:12:17 GMT Indexed on 2010/03/21 12:21 UTC
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The GAC in .NET 4.0 is cut into two parts now -- one half for .NET Framework 2.0 stuff, and the other for v4.0 stuff. When compiling any project, targeting .NET 2.0, 3.5, or what have you, this annoying error may pop up:

Could not load file or assembly 'System.EnterpriseServices, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies. The system cannot find the file specified.

In that case, open a run box and perform this copy command:

xcopy %ProgramFiles%\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\System.EnterpriseServices.dll %windir%\Microsoft.NET\assembly\GAC_32\System.EnterpriseServices\v4.0_4.0.0.0__b03f5f7f11d50a3a /e

This reconstructs the proper portion of the GAC for that one missing file.

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