Views not being copied when publish the project in netcore 2.0 visual studio 2017

ASP.NET Core MVC has a precompilation feature, that could be added by referencing the Microsoft.AspNetCore.Mvc.Razor.ViewCompilation package. Feature enabling/disabling configured by MvcRazorCompileOnPublish property is .csproj.

And by default, the package is added in ASP.NET Core 2.0 MVC applications:

If you're targeting ASP.NET Core 2.0 or higher on netcoreapp2.0, a reference to the Microsoft.AspNetCore.Mvc.Razor.ViewCompilation package is added by Microsoft.AspNetCore.All and you do not need to explicitly reference it.

and precompilation is enabled:

The ASP.NET Core 2.x project templates implicitly set MvcRazorCompileOnPublish to true by default, which means this node can be safely removed from the .csproj file:

<PropertyGroup>
    <TargetFramework>netcoreapp2.0</TargetFramework>
    <MvcRazorCompileOnPublish>true</MvcRazorCompileOnPublish>
  </PropertyGroup>

If you go to publish output folder, you will see dll like <project_name>.PrecompiledViews.dll which contains your views.

In .NET Core 3.1 or later, we need to add the following code in .csproj:

<PropertyGroup>
  <TargetFramework>netcoreapp3.1</TargetFramework>
  <CopyRazorGenerateFilesToPublishDirectory>true</CopyRazorGenerateFilesToPublishDirectory>
</PropertyGroup>

According to the docs:

When true, copies RazorGenerate items (.cshtml) files to the publish directory. Typically, Razor files aren't required for a published app if they participate in compilation at build-time or publish-time. Defaults to false.

It might be generating <project_name>.Views.dll by default. You need to set MvcRazorCompileOnPublishproperty false in your project .csproj file. By default it is true.

<PropertyGroup>
    <TargetFramework>netcoreapp2.1</TargetFramework>
    <MvcRazorCompileOnPublish>false</MvcRazorCompileOnPublish>    
</PropertyGroup>