WebApi cors for runtime 4.0

问题:

I need WebApi Cors dll for web api project. I installed Web Api version for .net 4 framework, because I use VS 2010. I tried to install web api cors lib via nuget (Install-Package Microsoft.AspNet.WebApi.Cors), and this error is shown "Microsoft.AspNet.WebApi.Client 5.1.1'. You are trying to install this package into a project that targets '.NETFramework,Version=v4.0', but the package does not contain any assembly references or content files that are compatible with that framework". Is there workaround to install Cors for web api client 4?

回答1:

The CORS is supported in Web API 2 that needs .NET Framework 4.5 and visual studio/express 2014.

It is not available for Web API 1

回答2:

CORS is natively supported in Web API 2 only. However, you can write your own extensions. Take a look at this tutorial by Carlos Figueira. The tutorial not only applies to the RC version but also to final version 1.

回答3:

For IIS 6 servers:

To CORS-enable Microsoft IIS6, perform the following steps:

• Open Internet Information Service (IIS) Manager
• Right click the site you want to enable CORS for and go to Properties
• Change to the HTTP Headers tab In the Custom HTTP headers section, click Add
• Enter Access-Control-Allow-Origin as the header name
• Enter * as the header value
• Click Ok twice

http://enable-cors.org/server_iis6.html

回答4:

You need to check EF version before inastalling above package if it is EF version 4.5 and above then it works otherwise it rollbacks below EF version 4.5

And ** Access-Control-Allow-Origin ** problem is solved no need to do extra work

and you can do it in VS 2013 web express

using System.Web.Http.Cors;
namespace WebApplication10
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Web API configuration and services

            var cors = new EnableCorsAttribute("*", "*", "*");
            config.EnableCors(cors);
            // Web API routes
            config.MapHttpAttributeRoutes();

            config.Routes.MapHttpRoute(
                name: "DefaultApi",
                routeTemplate: "api/{controller}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }
    }
}

Hope this will help Thank you

This is WebApiConfig.cs file

var cors = new EnableCorsAttribute("*", "*", "*");
config.EnableCors(cors);

and using System.Web.Http.Cors;

these are the changes you need to do. For Api Controller

public class ValuesController : ApiController
{

    // GET api/<controller>
    [HttpGet]
    public IEnumerable<string> Get()
    {
        return new string[] { "value1", "value2" };
    }

just add [HttpGet] attribute and all is set.