启用跨域ASP.net Web API

I have Microsoft Visual Studio Express 2013 for Web, Version 12.0.30501.00 Update 2. I have a solution with 2 project in it, one is a web api, and the second is an MVC project intended for for the views. I have create a simple web api returning httpresponsemessage and I can go in fiddler and I will see the json response. However in my second project when attempting to call through ajax I received a cross domain error.

我有Microsoft Visual Studio Express 2013 for Web，版本12.0.30501.00更新2.我有一个包含2个项目的解决方案，一个是web api，第二个是用于视图的MVC项目。我创建了一个简单的web api返回httpresponsemessage，我可以进入fiddler，我将看到json响应。但是在我尝试通过ajax调用的第二个项目中，我收到了跨域错误。

The solution I try to follow is this http://www.asp.net/web-api/overview/security/enabling-cross-origin-requests-in-web-api. However when installing Install-Package Microsoft.AspNet.WebApi.Cors -pre -project WebService in the console manager I received an error so I used this line instead. Install-Package Microsoft.AspNet.WebApi.Cors then I try to the next step which is config.EnableCors(); its state that

我试图遵循的解决方案是http://www.asp.net/web-api/overview/security/enabling-cross-origin-requests-in-web-api。但是，当在控制台管理器中安装Install-Package Microsoft.AspNet.WebApi.Cors -pre -project WebService时，我收到一个错误，所以我使用了这一行。安装包Microsoft.AspNet.WebApi.Cors然后我尝试下一步是config.EnableCors（）;它的状态

'System.Web.Http.HttpConfiguration' does not contain a definition for 'EnableCors' and no extension method 'EnableCors' accepting a first argument of type 'System.Web.Http.HttpConfiguration' could be found (are you missing a using directive or an assembly reference?)

I am not sure what to afterward, I also try to add using System.Web.Http.Cors; but state that the namespace does not exists. This visual studio was downloaded about 3 weeks ago, I feel this feature should not be hard to install as it fully supported, is there something that i am missing?

我不知道后来要做什么，我也尝试使用System.Web.Http.Cors添加;但声明命名空间不存在。这个视觉工作室是在大约3周前下载的，我觉得这个功能应该不难安装，因为它完全支持，有什么东西我不见了吗？

2 个解决方案

#1

You should install a Nuget package Microsoft.AspNet.WebApi.Cors

您应该安装Nuget包Microsoft.AspNet.WebApi.Cors

From the menu in visual studio, go to Management Packages, and then type in the name of the package

从visual studio的菜单中，转到Management Packages，然后键入包的名称

Note:
To install from Package Manager Console, use Install-Package Microsoft.AspNet.WebApi.Cors

注意：要从Package Manager控制台进行安装，请使用Install-Package Microsoft.AspNet.WebApi.Cors

#2

install a Nuget package `"Microsoft.AspNet.WebApi.Cors" (version="5.1.0")

安装Nuget包`“Microsoft.AspNet.WebApi.Cors”（version =“5.1.0”）

Add following line in your WebApiConfig.cs file

在WebApiConfig.cs文件中添加以下行

config.EnableCors(new EnableCorsAttribute("*", "*", "*"));

#1