blocks|key|2715552|text|检查你的项目属性，选择build，advanced，看看是否有C#+6.0作为默认设置。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2715553|目前有对MVC5和C#+6.0的完美支持，并且工作得非常好！|2715554|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

Check your project properties, go to build, advanced and see if C# 6.0 if you don't have it as default.

Currently there's perfect support for MVC5 and C# 6.0 and works amazingly well!

blocks|key|2715560|text|这在MVC5(经测试的5.2.3)中有效，您只需添加roslyn代码dom+Nuget包|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2715561|.NET编译器的CodeDOM提供程序...|2715562|使用新的|2715563|编译器平台("Roslyn")编译器作为服务CodeDOM的.NET替换API提供者。这为使用CodeDOM的系统中的新语言功能提供了支持(例如，ASP.NET运行时编译)，并提高了这些系统的编译性能。|blockquote|2715564|2715565|2715566|PM>+Install-Package+Microsoft.CodeDom.Providers.DotNetCompilerPlatform|code-block|syntax|javascript|2715567|https://www.nuget.org/packages/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/|offset|length|2715568|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|0|0|0|0|0|0|2A|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|13|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|15|8|@]|9|@]|A|$]]|$1|K|3|L|5|M|7|16|8|@]|9|@]|A|$N|O]]|$1|P|3|Q|5|6|7|17|8|@]|9|@$R|18|S|19|1|1A]]|A|$]]|$1|T|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|U|$V|$5|W|X|Y|A|$Z|Q]]]]

This works in MVC 5 (tested 5.2.3), you just need to add the roslyn code dom Nuget package

<h2>CodeDOM Providers for .NET Compiler...</h2>

<blockquote>
 Replacement CodeDOM providers that use the new .NET Compiler Platform ("Roslyn") compiler as a service APIs. This provides support for new language features in systems using CodeDOM (e.g. ASP.NET runtime compilation) as well as improving the compilation performance of these systems.
</blockquote>

<pre><code>PM&gt; Install-Package Microsoft.CodeDom.Providers.DotNetCompilerPlatform
</code></pre>

<a href="https://www.nuget.org/packages/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/">https://www.nuget.org/packages/Microsoft.CodeDom.Providers.DotNetCompilerPlatform/</a>

blocks|key|141660|text|嗯，我有MVC5，最近安装了VS+2015。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|141661|我已经安装了CodeDOM提供程序包，但它没有帮助...但在那之后我意识到，这个包只支持框架4.5，而我在测试中将目标框架设置为4.6+-它可以与4.5一起工作……|141662|所以也要注意目标框架。如果你有4.5版本--只需安装Microsoft.CodeDom.Providers.DotNetCompilerPlatform.包但如果您的目标是4.5.1-4.6，则必须在web.config部分中进行更改|141663|++<system.codedom>
++++<compilers>
++++++<compiler+language="c#;cs;csharp"+extension=".cs"+type="Microsoft.CSharp.CSharpCodeProvider,+System,+Version=4.0.0.0,+Culture=neutral,+PublicKeyToken=b77a5c561934e089"+warningLevel="4"+compilerOptions="/langversion:6+/nowarn:1659;1699;1701">
++++++++++<providerOption+name="CompilerVersion"+value="v4.0"/>
++++++</compiler>
++++++<compiler+language="vb;vbs;visualbasic;vbscript"+extension=".vb"+type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider,+Microsoft.CodeDom.Providers.DotNetCompilerPlatform,+Version=1.0.0.0,+Culture=neutral,+PublicKeyToken=31bf3856ad364e35"+warningLevel="4"+compilerOptions="/langversion:14+/nowarn:41008+/define:_MYTYPE=\&quot;Web\&quot;+/optionInfer%2B"/>
++++</compilers>
++</system.codedom>|code-block|syntax|javascript|141664|对于C#，只需将类型更改为：|offset|length|style|BOLD|141665|type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider,+Microsoft.CodeDom.Providers.DotNetCompilerPlatform,+Version=1.0.0.0,+Culture=neutral,+PublicKeyToken=31bf3856ad364e35"+|141666|entityMap^0|0|0|0|0|2|2|8|2|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|Y|8|@$M|Z|N|10|O|P]|$M|11|N|12|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|H|7|13|8|@]|9|@]|A|$I|J]]|$1|S|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|T|$]]

Well, I have MVC5 and recently installed VS 2015.

I've installed CodeDOM providers package, but it didn't help... 
But after that I realized, that package supports framework 4.5 only, while I have target framework set to 4.6 during tests - it works with 4.5 though...

So pay attention also to target framework. If you have 4.5 - just install package Microsoft.CodeDom.Providers.DotNetCompilerPlatform. But if you have 4.5.1-4.6 as a target, you will have to change in web.config section

<pre><code> &lt;system.codedom&gt;
 &lt;compilers&gt;
 &lt;compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CSharp.CSharpCodeProvider, System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701"&gt;
 &lt;providerOption name="CompilerVersion" value="v4.0"/&gt;
 &lt;/compiler&gt;
 &lt;compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\&amp;quot;Web\&amp;quot; /optionInfer+"/&gt;
 &lt;/compilers&gt;
 &lt;/system.codedom&gt;
</code></pre>

For C#, just change type to:

<pre><code>type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" 
</code></pre>

blocks|key|141668|text|包括遵循安装最新Microsoft.CodeDom.Providers.DotNetCompilerPlatform的建议，我还必须将我的根+Web.config+system.codedom设置为此，以最终消除Visual+Studio+2015中的所有错误：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|BOLD|entityRanges|data|141669|++<system.codedom>
++++<compilers>
++++++<compiler+language="c#;cs;csharp"+extension=".cs"
++++++++type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider,+Microsoft.CodeDom.Providers.DotNetCompilerPlatform,+Version=1.0.0.0,+Culture=neutral,+PublicKeyToken=31bf3856ad364e35"
++++++++warningLevel="4"+compilerOptions="/langversion:6+/nowarn:1659;1699;1701"/>
++++++<compiler+language="vb;vbs;visualbasic;vbscript"+extension=".vb"
++++++++type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider,+Microsoft.CodeDom.Providers.DotNetCompilerPlatform,+Version=1.0.0.0,+Culture=neutral,+PublicKeyToken=31bf3856ad364e35"
++++++++warningLevel="4"+compilerOptions="/langversion:14+/nowarn:41008+/define:_MYTYPE=\&quot;Web\&quot;+/optionInfer%2B"/>
++++</compilers>
++</system.codedom>|code-block|syntax|javascript|141670|现在重新启动Visual+Studio，应该可以了。|141671|entityMap^0|8|1E|1Z|A|2A|E|2Y|I|1X|1|0|0|6|D|0^^$0|@$1|2|3|4|5|6|7|P|8|@$9|Q|A|R|B|C]|$9|S|A|T|B|C]|$9|U|A|V|B|C]|$9|W|A|X|B|C]|$9|Y|A|Z|B|D]]|E|@]|F|$]]|$1|G|3|H|5|I|7|10|8|@]|E|@]|F|$J|K]]|$1|L|3|M|5|6|7|11|8|@$9|12|A|13|B|C]]|E|@]|F|$]]|$1|N|3|-4|5|6|7|14|8|@]|E|@]|F|$]]]|O|$]]

Including following the advice of installing the latest <code>Microsoft.CodeDom.Providers.DotNetCompilerPlatform</code> I also had to set my root <code>Web.config</code> <code>system.codedom</code> to this to finally get all of the errors in <code>Visual Studio 2015</code> to go away:

<pre><code> &lt;system.codedom&gt;
 &lt;compilers&gt;
 &lt;compiler language="c#;cs;csharp" extension=".cs"
 type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
 warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701"/&gt;
 &lt;compiler language="vb;vbs;visualbasic;vbscript" extension=".vb"
 type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"
 warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\&amp;quot;Web\&amp;quot; /optionInfer+"/&gt;
 &lt;/compilers&gt;
 &lt;/system.codedom&gt;
</code></pre>

Now restart <code>Visual Studio</code> and that should do it.

blocks|key|141711|text|Visual+Studio2015还将在项目菜单中显示一个选中了ASP.NET网站/+web应用程序的Enable+C#6+/+VB+14。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|141712|这将实际安装Microsoft.CodeDom.Providers.DotNetCompilerPlatform和Microsoft.Net.Compilers包到您的项目中，并在web.config文件中添加适当的标记。|141713|​|141714|📷|atomic|141715|141716|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/2a2b257135f24b35840197bf22544d31.png|imageAlt^0|1F|I|0|6|1E|1L|N|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@$9|10|A|11|B|C]|$9|12|A|13|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|14|8|@]|D|@]|E|$]]|$1|J|3|K|5|L|7|15|8|@]|D|@$9|16|A|17|1|18]]|E|$]]|$1|M|3|I|5|6|7|19|8|@]|D|@]|E|$]]|$1|N|3|-4|5|6|7|1A|8|@]|D|@]|E|$]]]|O|$P|$5|Q|R|S|E|$T|U|V|-4]]]]

Visual Studio 2015 will also show an <code>Enable C#6 / VB 14</code> in the Project menu with an ASP.NET web site / web application selected. 

This will de facto install <code>Microsoft.CodeDom.Providers.DotNetCompilerPlatform</code> and <code>Microsoft.Net.Compilers</code> packages into your project and add appropriate tags into web.config file.

<a href="https://i.stack.imgur.com/6W24N.png" rel="noreferrer"><img src="https://i.stack.imgur.com/6W24N.png" alt="visual studio 2015 - enable cs6 snipp"></a>

blocks|key|2715701|text|我在Visual+Studio+2015中也遇到了同样的问题。这里的另一个答案提到了我使用的解决方案，但他们错误地指定了修复，并且从未给出澄清。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2715702|在Visual+Studio菜单上，选择项目，如果遇到此问题，您应该会看到子项Enable+C#6+/VB14。选择此菜单子项目。它将从Nuget下载正确的包并安装它们。之后，重新启动Visual+Studio并重新加载您的解决方案。|offset|length|style|BOLD|2715703|我无法验证这是否也会将项目属性>构建>高级>语言版本选项修复为C#+6，因此您可能希望在从菜单启用C#+6后也选中此选项。|2715704|entityMap^0|0|K|2|13|G|0|B|F|V|4|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|M|8|@$D|N|E|O|F|G]|$D|P|E|Q|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|R|8|@$D|S|E|T|F|G]|$D|U|E|V|F|G]]|9|@]|A|$]]|$1|J|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|K|$]]

I was having this same problem in Visual Studio 2015. Another answer here alluded to the solution I used, but they incorrectly specified the fix and never gave clarification. 

On the the Visual Studio menu, select Project and you should see the sub-item Enable C#6 / VB 14 if you are having this problem. Select this menu sub-item. It will download the correct packages from Nuget and install them. After this, restart Visual Studio and reload your solution.

I cannot verify if this will also fix the Project Properties > Build > Advanced > Language Version selection to C# 6, so you might want to check this as well after enabling C# 6 from the menu.

blocks|key|2715706|text|<compiler+language="c#;cs;csharp"+extension=".cs"+type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider,+Microsoft.CodeDom.Providers.DotNetCompilerPlatform,+Version=1.0.4.0,+Culture=neutral,+PublicKeyToken=31bf3856ad364e35"+warningLevel="4"+compilerOptions="/langversion:7+/nowarn:1659;1699;1701"+/>
<compiler+language="vb;vbs;visualbasic;vbscript"+extension=".vb"+type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider,+Microsoft.CodeDom.Providers.DotNetCompilerPlatform,+Version=1.0.4.0,+Culture=neutral,+PublicKeyToken=31bf3856ad364e35"+warningLevel="4"+compilerOptions="/langversion:15+/nowarn:41008+/define:_MYTYPE=\&quot;Web\&quot;+/optionInfer%2B"+/>|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|2715707|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>&lt;compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:7 /nowarn:1659;1699;1701" /&gt;
&lt;compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.4.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:15 /nowarn:41008 /define:_MYTYPE=\&amp;quot;Web\&amp;quot; /optionInfer+" /&gt;
</code></pre>

I am testing Visual Studio 2015 with C# 6.0 but the language features are not working. In an MVC web application, the following code does compile:

<pre><code>if (!string.IsNullOrWhiteSpace(Model.Profile?.TypeName))
{
 // More logic here...
}
</code></pre>

However, when I run the application via Debug and IIS Express, I get the following error:

<blockquote>
 CS1525: Invalid expression term '.'
</blockquote>

How do I enable these features?

C# 6.0 Features Not Working with Visual Studio 2015

Visual Studio

编译器

我正在使用C# 6.0测试Visual Studio2015，但语言功能不起作用。在MVC web应用程序中，可以编译以下代码：if (!string.IsNullOrWhiteSpace(Model.Profile?.TypeName)){    // More logic here...}但是，当我通过Debug和...

问C# 6.0功能不适用于Visual Studio2015
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