在多个程序集中定义的 System.Tuple [英] System.Tuple defined in multiple assemblies

问题描述

我刚刚在 Windows 8 中安装了 VS 11.当我获得使用 VS 2010 构建的最新解决方案时，然后构建它，我收到此错误(在 VS 11 中):

I just installed VS 11 within Windows 8. When I got the latest of a solution built with VS 2010, then built it, I'm getting this error (in VS 11):

预定义类型System.Tuple"在多个程序集中定义在全局别名中；使用来自 'c:Program Files 的定义(x86)参考程序集MicrosoftFramework.NETFrameworkv4.0mscorlib.dll'

The predefined type 'System.Tuple' is defined in multiple assemblies in the global alias; using definition from 'c:Program Files (x86)Reference AssembliesMicrosoftFramework.NETFrameworkv4.0mscorlib.dll'

我无法通过 Google 找到答案.而且我不知道全局别名"是什么.这些词太笼统，无法通过 Google 搜索找到.

I haven't been able to find an answer via Google. And I don't know what the "global alias" is. Those words are too generic to find via a Google search.

VS 11 自动进行了一些更改，所以我取消了这些更改，重新编译，并得到了同样的错误.

VS 11 automatically made some changes, so I undid those, recompiled, and got the same error.

我不知道该怎么办.有谁知道如何解决这个错误?什么是全局别名?

I'm not sure what to do. Anyone know how to resolve this error? And what is the global alias?

编辑 - 这些是项目中当前存在的引用

我尝试删除未使用的引用，但仍然出现错误.

I tried deleting references that weren't used but I still got the error.

编辑 2 - 答案

这个 System.Tuple，在 Raven 程序集中，与 .NET 4.0 System.Tuple 冲突.感谢 Christopher Currens 在他的回答中解释了这一点.

This System.Tuple, within the Raven assembly, conflicts with the .NET 4.0 System.Tuple. Thank you to Christopher Currens for explaining this in his answer.

推荐答案

看起来 Raven.Abstractions 是 .NET 3.5 程序集，而不是 .NET 4.0 参考.如果您查看源代码 此处为 RavenDB，如果它是为 .NET 3.5 构建的，你会注意到它定义了一个 Tuple 类.

It looks like Raven.Abstractions is a .NET 3.5 assembly, instead of a .NET 4.0 reference. If you look at the source code for RavenDB Here, you'll notice that it defines a Tuple<T, U> class if it's being built for .NET 3.5.

您一定在某个时候将您的项目从 .NET 3.5 更新到了 .NET 4.0，因为我还注意到您引用了 System.Core.在 .NET 4 中，System.Core 是默认引用，因此项目中的引用是多余的.

You must have updated your project from .NET 3.5 to .NET 4.0 at some point, because I also notice you have a reference to System.Core. In .NET 4, System.Core is reference by default and so that reference in your project is redundant.

我的建议是您找到项目中已经引用的所有程序集，并将它们替换为 .NET 4 版本(如果可用).我知道 .NET 具有额外的兼容性，因为它允许在一个进程中同时加载两个版本的运行时，但我无法想象它不会在某种程度上影响性能/em>，即使只有一点点..NET 4 运行时在很多方面都更胜一筹，特别是大对象堆.我想我在咆哮一点.只需将您可以使用的程序集更新到 4.0，或者将您的项目版本更改回 3.5.

My suggestion is you find all assemblies that you are already referencing in your project and replace them with .NET 4 versions, if available. I know that .NET has that extra compatibility, in that it allows two versions of the runtime to be loaded in a process at the same time, but I can't imagine that it doesn't affect performance on some level, even if only a tiny bit. The .NET 4 runtime is superior in a lot of ways though, specifically the large object heap. I guess I'm ranting a little bit. Just update what assemblies you can to 4.0, or change your project's version back down to 3.5.

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