注意:这只是上面这个答案的缩写

Open NuGet Package manager console and run PM> Install-Package Microsoft.AspNet.WebApi Add references to System.Web.Routing, System.Web.Net and System.Net.Http dlls if not there already Add the following class public static class WebApiConfig { public static void Register(HttpConfiguration config) { // Web API routes config.MapHttpAttributeRoutes(); config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional } ); } } Add Application_Start method if not there already (in global.asax.cs file) protected void Application_Start() { //this should be line #1 in this method GlobalConfiguration.Configure(WebApiConfig.Register); } Right click controllers folder > add new item > web > Add Web API controller namespace <Your.NameSpace.Here> { public class VSController : ApiController { // GET api/<controller> : url to use => api/vs public string Get() { return "Hi from web api controller"; } } }

注意:这只是上面这个答案的缩写

Open NuGet Package manager console and run PM> Install-Package Microsoft.AspNet.WebApi Add references to System.Web.Routing, System.Web.Net and System.Net.Http dlls if not there already Add the following class public static class WebApiConfig { public static void Register(HttpConfiguration config) { // Web API routes config.MapHttpAttributeRoutes(); config.Routes.MapHttpRoute( name: "DefaultApi", routeTemplate: "api/{controller}/{id}", defaults: new { id = RouteParameter.Optional } ); } } Add Application_Start method if not there already (in global.asax.cs file) protected void Application_Start() { //this should be line #1 in this method GlobalConfiguration.Configure(WebApiConfig.Register); } Right click controllers folder > add new item > web > Add Web API controller namespace <Your.NameSpace.Here> { public class VSController : ApiController { // GET api/<controller> : url to use => api/vs public string Get() { return "Hi from web api controller"; } } }

只要你在controllers文件夹下添加了一个“WebApi Controller”，Visual Studio就会自动处理依赖关系;

Visual Studio has added the full set of dependencies for ASP.NET Web API 2 to project 'MyTestProject'. The Global.asax.cs file in the project may require additional changes to enable ASP.NET Web API. Add the following namespace references: using System.Web.Http; using System.Web.Routing; If the code does not already define an Application_Start method, add the following method: protected void Application_Start() { } Add the following lines to the beginning of the Application_Start method: GlobalConfiguration.Configure(WebApiConfig.Register);

我也有同样的问题，解决方法很简单

右击soltion 安装Microsoft.ASP.NET.WebApi从“管理Nuget包Sulotion”

就是这样;)

在你开始合并MVC和Web API项目之前，我建议你先阅读一下优缺点，把它们区分为不同的项目。一个非常重要的事情(我自己的)是认证系统，这是完全不同的。

如果你需要同时在MVC和Web API上使用经过身份验证的请求，你需要记住Web API是RESTful的(不需要保持会话，简单的HTTP请求等)，但MVC不是。

要查看实现的差异，只需在Visual Studio 2013中从模板创建2个不同的项目:一个用于MVC，一个用于Web API(不要忘记在创建过程中打开“个人认证”)。您将在authenticationcontrollers中看到许多不同之处。

所以，要注意。

更新11/22/2013 -这是最新的WebApi包:

Install-Package Microsoft.AspNet.WebApi

原始答案(这是一个较旧的WebApi包)

Install-Package AspNetWebApi

更多的细节。