.net：应引用模块System.Core版本3.5.0.0
我有几个可能相关的问题。
首先，在我的 ASP.NET MVC 项目视图中，如下所示的 lambda 表达式语法：
<% =Html.TextBoxFor(x => x.Umi)%>
导致 ReSharper 突出显示该行并显示消息：
Module 'System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' should be referenced
其次，在 IEnumerable 会导致编译错误，因为找不到扩展方法。Where 扩展方法同一视图中的
在项目中添加对 System.Core 的引用会导致以下结果：
A reference to System.Core could not be added. This component is automatically referenced by the build system.
我认为这些内容与该项目是作为 .NET 4 项目创建的事实有关，但我必须将其更改为目标 3.5，因为服务器不这样做已安装 4 个。
有人帮忙吗？
I have a couple of probably related issues.
Firstly in my ASP.NET MVC project view, lambda expression syntax like this:
<% =Html.TextBoxFor(x => x.Umi)%>
results in ReSharper highlighting the line and displaying the message :
Module 'System.Core, Version=3.5.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' should be referenced
Secondly, using the Where extension method on an IEnumerable<T> in the same view causes a compilation error because the extension method cannot be found.
Adding a reference in the project to System.Core results in this:
A reference to System.Core could not be added. This component is automatically referenced by the build system.
I assume this stuff is related to the fact that the project was created as a .NET 4 project but I had to change it to target 3.5 instead as the server doesn't have 4 installed.
Anyone help?
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尽管我仍然不知道是什么导致了问题，但我能够通过修改项目的 .csproj 文件以手动添加引用来修复它。
将 System.Core 的引用直接添加到 .csproj 文件中的代码如下：
Although I still have no idea what caused the problem, I was able to fix it by modifying the project's .csproj file to manually add the reference.
The code to add a reference to System.Core directly into the .csproj file is below: