Error when referencing .Net Standard 2.0 library from Asp.Net 4.7 project

Question

I have an MVC project targeting asp.net 4.7. And i have created a class library which targets .Net standard 2.0

If i reference the class library from my MVC Project i get the following exception on application startup.

System.MissingMethodException: 'Method not found:

Message "Method not found: 'System.Collections.ObjectModel.Collection`1 System.Web.Http.HttpConfiguration.get_MessageHandlers()'."

At

GlobalConfiguration.Configure(WebApiConfig.Register);

If i remove the reference everything is back to normal. Any ideas that may be wrong with that?

Answer 1

You need to add this binding redirect to web.config:

<dependentAssembly>
   <assemblyIdentity name="System.Net.Http" publicKeyToken="b03f5f7f11d50a3a" culture="neutral" />
   <bindingRedirect oldVersion="0.0.0.0-4.2.0.0" newVersion="4.2.0.0" />
</dependentAssembly>

Answer 2

如果您的mvc项目以.net 4.6.1为目标，则可以使用.net标准2.0类库。