Feature 'interpolated strings' is not available in C# 5. Please use language version 6 or greater

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故里飘歌

There is a similar question to this here but I believe that involves a different cause.

I moved a class from a newer project into an older project. Both were targeti

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予麋鹿

2020-12-15 05:23

I eventually found the place to change it. It seems sometimes when you update your targets framework version this does not get changed.

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生来不讨喜

2020-12-15 05:33

Install DotNetCompilerPlatform version 2.1.0

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谎友^

2020-12-15 05:36

(It can applicable VS 2019 - .NET Framework 4.8 Web Application projects easily)

I have realized this issue after install DotNetCompilerPlatform v3.6

I have looked for TheColonel26's answer but I couldn't change selected language version:

Appearantly, we can not change selected language version. (For details look here)

After that I have used kfwbird's answer but with changes for newer version:

 <system.codedom>
     <compilers>
         <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=3.6.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
         <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=3.6.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
     </compilers>
 </system.codedom>

Now it works as should be.

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一整个雨季

2020-12-15 05:40

Add this to your web.config. It is probably added automatically after installing DotNetCompilerPlatform.

<system.codedom>
  <compilers>
    <compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:1659;1699;1701" />
    <compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=2.0.1.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:default /nowarn:41008 /define:_MYTYPE=\&quot;Web\&quot; /optionInfer+" />
  </compilers>
</system.codedom>

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