CS1685 Warning causes a CS0433 error when targeting 3.5 in VS2010

Posted by Adam Driscoll on Stack Overflow See other posts from Stack Overflow or by Adam Driscoll
Published on 2010-05-10T20:44:48Z Indexed on 2010/05/10 20:54 UTC
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Filed under:

visual-studio-2010

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c#

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.net-3.5

I have a 2010 project that is targeting .NET v3.5. It was working fine until I started to mess with configurations a bit and now I cannot figure out what I'm doing wrong. The project doesn't have ANY references added. It won't even let me add a reference to System.Core as it is added by the 'build system'.

warning CS1685: The predefined type 'System.Func' is defined in multiple assemblies in the global alias; using definition from 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll'

IFilter.cs(82,49): error CS0433: The type 'System.Func' exists in both 'c:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\v3.5\System.Core.dll' and 'c:\Windows\Microsoft.NET\Framework\v4.0.30319\mscorlib.dll'

Looks like something is grabbing onto 4.0 but I'm not quite sure how to fix it. Any one else run into this?

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