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Found this error just after upgrading the .NET framework to 4.7.2:
System.Web.HttpCompileException: some.cshtml(95): error CS0012: The type 'IEnumerable<>' is defined in an assembly that is not referenced. You must add a reference to assembly 'netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'.'
Where should I add the reference?
911
When you get this error, it means that code you are using makes a reference to a type that is in an assembly, but the assembly is not part of your project so it can't use it.
You could resolve this CS0012 by compiling with /reference:cs0012b. dll;cs0012a. dll , or in Visual Studio by using the Add Reference Dialog Box to add a reference to cs0012a. dll in addition to cs0012b.
Found at at github. Add the following to the web.Config file:
<compilation debug="true" targetFramework="4.7.2" >
<assemblies>
<add assembly="netstandard, Version=2.0.0.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51"/>
</assemblies>
</compilation>
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