.Net Core View: the name "Layout" does not exist in the current context

Question

I'm using Visual Studio 2017 to build a .net core mvc project.

When I add a view in this way: Right click folder -> Add View -> Add

Then the name "Layout" does not exist in the current context

Restart vs or build the project this error still exist.

However, If I add view in this way:

Right click folder -> Add New Items -> MVC View Page

the Layout can be recognized.

Is there any difference?

Answer 1

If you are using vs 2017 you have to add this code in new csproj which you created.

<PropertyGroup>
    <OutputType>Library</OutputType>
</PropertyGroup>

Because When you create a new Web application, this gets set to the "Web" SDK:

<Project Sdk="Microsoft.NET.Sdk.Web">...</Project>

so the Web SDK imports additional tasks to allow design-time processing of Web resources, such as Razor views. Change the SDK in your plugin library to Web. after you build error should be vanished.