如何使用WebAPI没有ASP.NET MVC？

Although ASP.NET Web API is packaged with ASP.NET MVC,it is easy to
add Web API to a traditional ASP.NET Web Forms application. This
tutorial walks you through the steps.

To use Web API in a Web Forms application,there are two main steps:

Add a Web API controller that derives from the ApiController class.
Add a route table to the Application_Start method. Create a Web Forms
Project

Start Visual Studio 2010 and select New Project from the Start page.
Or,from the File menu,select New and then Project.

In the Templates pane,select Installed Templates and expand the Visual C# node. Under Visual C#,select Web. In the list of project templates,select ASP.NET Web Application. Enter a name for the project and click OK.