问题
The VS 2015 Update 3 is out and I have started playing with it. But I hit a problem soon after. The IApplicationBuilder interface does not appear to have a definition for the UseWebApi extension method, but IAppBuilder does. In effect, I want to register my Web Api with the OWIN pipeline. Am I missing something?
回答1:
There is no need for the IApplicationBuilder interface to have a definition for the UseWebApi extension method. In IAppBuilder, it was used to register a Web Api with OWIN. But for IApplicationBuilder, because ASP.NET Core uses a unified model for both Web Api and MVC services, simply use the IApplicationBuilder.UseMvc method. It works!
回答2:
There is no UseWebApi in Asp.NET Core so I am not sure what the "relevant package" is. Here is a tutorial showing how to build Web API with Asp.NET Core.
回答3:
NuGet command:
Install-Package Microsoft.AspNet.WebApi.OwinSelfHost
Source
来源：https://stackoverflow.com/questions/38163548/iapplicationbuilder-does-not-contain-a-definition-for-usewebapi