Visual Studio 2010中不能再构建.NET v3.5版本 [英] Visual Studio 2010 Can no longer build .NET v3.5
问题描述
我有一个针对.NET v3.5版本2010年的项目。令人费解的是我不能再建V3.5项目。该项目没有添加任何引用。它甚至不会让我添加的引用System.Core程序，因为它是由构建系统的补充。
I have a 2010 project that is targeting .NET v3.5. Inexplicably I can no longer build v3.5 projects. 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'.
警告CS1685：在predefined型'System.Func中定义 在全球多个程序集 别名;使用定义 C：\ WINDOWS \ Microsoft.NET \框架\ v4.0.30319 \ mscorlib.dll中'
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）：错误CS0433：类型System.Func 存在于两个C：\ Program Files文件 （86）\参考 大会\微软\框架\器v3.5 \ System.Core.dll的' 和 C：\ WINDOWS \ Microsoft.NET \框架\ v4.0.30319 \ mscorlib.dll中'
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'
看起来像是被抓到4.0，但我不太清楚如何解决它。任何其他人碰到这种？
Looks like something is grabbing onto 4.0 but I'm not quite sure how to fix it. Any one else run into this?
同事有同样的问题。花的Windows重新安装到纠正问题
Coworker had this same issue. It took a reinstall of Windows to correct the problem
我已经开了这一个错误：<一href="https://connect.microsoft.com/VisualStudio/feedback/details/558245/warning-cs1685-when-compiling-a-v3-5-net-application-in-visual-studio-2010">https://connect.microsoft.com/VisualStudio/feedback/details/558245/warning-cs1685-when-compiling-a-v3-5-net-application-in-visual-studio-2010
I've opened a bug on this one: https://connect.microsoft.com/VisualStudio/feedback/details/558245/warning-cs1685-when-compiling-a-v3-5-net-application-in-visual-studio-2010
如果编译器设置为verbose我看到这样的：
If the compiler is set to verbose I see this:
FrameworkPathOverride = C：\ WINDOWS \ Microsoft.NET \框架\ v4.0.30319
FrameworkPathOverride = C:\Windows\Microsoft.NET\Framework\v4.0.30319
这是定义为：
指定mscorlib.dll中的位置 和microsoft.visualbasic.dll中。本 参数相当于 /在VBC.EXE的sdkpath开关 编译器。
Specifies the location of mscorlib.dll and microsoft.visualbasic.dll. This parameter is equivalent to the /sdkpath switch of the vbc.exe compiler.
其他一些有趣的花絮：我创建了一个新的项目一起，不能建立V3.5的。我可以建立2.0，3.0，3.5客户端配置文件，4.0和4.0客户端配置文件没有问题。 VB.NET可以建立V3.5，但C＃不能。我已经试过了.NET 3.5，4.0，重新安装和Visual Studio 2010，但没有成功。所示的Visual Studio调试日志什么有趣和安全模式是行不通的。
Some other interesting tidbits: I've created a new project all together and cannot build v3.5 at all. I can build 2.0, 3.0, 3.5 Client Profile, 4.0 and 4.0 Client Profile with no problem. VB.NET can build v3.5 but C# cannot. I've tried a reinstall of .NET 3.5, 4.0 and Visual Studio 2010 with no success. Visual Studio debug logs shown nothing interesting and Safe Mode does not work.
试图避免在Windows重装......
Trying to avoid a Windows reinstall...
编辑：我已经认识到别人都面临这个问题为好。 <一href="http://social.msdn.microsoft.com/Forums/en-US/netfxbcl/thread/b2c30611-633e-4c14-9a6a-257fee9ddf6a">Link, <一href="http://social.msdn.microsoft.com/Forums/en/setup$p$prelease/thread/fe431ea3-4760-43b3-a5c1-2ccb2d2c158d">Link, <一href="http://social.msdn.microsoft.com/Forums/en/sharepointdevelopment$p$prelease/thread/05a9eb3e-eb90-4110-98ca-6b6396ecad4a">Link
I've come to realize others are facing this issue as well. Link, Link, Link
重新安装好几次。 Visual Studio中卸载后，自己不清理。我已经剥离了一个虚拟机来开发的，直到我有机会重新安装我的主要操作系统。
Reinstalled several times. Visual Studio uninstalls do not clean up after themselves. I've spun up a VM to develop on until I have a chance to reinstall my main OS.
推荐答案
这个问题是造成本<一所做的更改href="http://stackoverflow.com/questions/2094694/launch-powershell-under-net-4/2096906#2096906">post.强制的最新CLR版本的装载是什么原因造成的问题。小心！
The problem was the caused by the changes made in this post. Forcing the loading of the latest CLR version is what caused the problem. Be careful!
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