At work, I recently run into a strange build error when building from MSBuild and TFSBuild while the same solution built inside of Visual Studio 2008 just fine.
The error message was:
error MC3015: The attached property '?' is not defined on '?' or one of its base classes.
(obviously with real names instead of the questionmarks)
Feeding the above into google provided the following solution to the issue:
One of the differences between building in VS and command line is that a WPF build in VS defaults to
<AlwaysCompileMarkupFilesInSeparateDomain>true</AlwaysCompileMarkupFilesInSeparateDomain>.
Outside of VS, the default is false.
(Answer by Rob Relyea)
Adding that to the relevant .csproj made the project build successfully.
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