asp.net core build error : 'HttpRequestMessageExtensions'

问题

Using ASPNet Core 1.1 Web API template and trying to create a response on Post. Getting the below error while building the project. Thanks for your help !

Controllers\MessagesController.cs(37,28,37,72): error CS0433: The type 'HttpRequestMessageExtensions' exists in both 'System.Net.Http.Formatting, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' and 'System.Web.Http, Version=5.2.3.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35'

回答1:

You should remove reference to System.Web.Http, as ASP.NET Core doesn't use it.

来源：https://stackoverflow.com/questions/42144611/asp-net-core-build-error-httprequestmessageextensions