跨域将Ajax json发布到Controller，“不允许” Access-Control-Allow-Headers

我建议您JSONP，它是唯一真正的跨浏览器和跨域AJAX的可靠解决方案。因此，您可以从编写自定义操作结果开始，该结果将用回调包装JSON响应：

public class JsonpResult : ActionResult{    private readonly object _obj;    public JsonpResult(object obj)    {        _obj = obj;    }    public override void ExecuteResult(ControllerContext context)    {        var serializer = new JavascriptSerializer();        var callbackname = context.HttpContext.Request["callback"];        var jsonp = string.Format("{0}({1})", callbackname, serializer.Serialize(_obj));        var response = context.HttpContext.Response;        response.ContentType = "application/json";        response.Write(jsonp);    }}

然后：

public ActionResult AddPerson(Person person){    return new JsonpResult(true);}

最后执行跨域AJAX调用：

$.ajax({    url: 'http://somedomain.com/Ajax/AddPerson',    jsonp: 'callback',    dataType: 'jsonp',    data: { firstName: 'john', lastName: 'smith' },    success: function (result) {        alert(result);    }});