C# - MVC - 参考 class 库项目到主项目的问题

Question

Currently I try to do an ASP.NET MVC project (.NET 4.5.2 framework) with multiple layers (business layer, data access layer, entities layer and main layer).

My business layer is a class library project. So when I try to references this project from the main layer, I get this error:

The project "Business Layer" has .netstandard 2.0 as target. Can't references to .NETFramework Version =v4.5.2 project as target

This is a web.config section

<configuration>
.
.
  <system.web>
    <compilation debug="true" targetFramework="4.5.2"/>
    <httpRuntime targetFramework="4.5.2"/>
  </system.web>

<\configuration>

Does someone know how to do this reference?

Answer 1

The problem encountered is due to the different version support because you are trying to reference a.Net Standard 2.0 library to .Net Framework 4.5.2 , you can refer to the table below, you need to upgrade your project .Net Framework 4.5.2 to .Net Framework 4.6.1 .