The ASP. NET MVC Web API enables cross-domain methods

1. Modify the Web. config directly, but this is for all Action.

<location path= "Sample.txt" >    <system.webServer>      

Method 2.

Add a category with the content shown below:

Using system;using system.collections.generic;using system.linq;using system.web;using System;using System.web.http.filters;namespace workflow.filters{Public    class Allowcrosssitejsonattribute: ActionFilterAttribute    {public        override void OnActionExecuted (Httpactionexecutedcontext ActionExecutedContext)        {            if (actionexecutedcontext.response! = null)                ACTIONEXECUTEDCONTEXT.RESPONSE.HEADERS.ADD ("Access-control-allow-origin", "*");            Base. OnActionExecuted (ActionExecutedContext);}}}    

Finally, you can allow data to be transferred across domains by adding attributes to the Controller or Action :

    [Allowcrosssitejson]    public class Instancescontroller:apicontroller    {        //...    }

The ASP. NET MVC Web API enables cross-domain methods