asp.net-mvc – MVC3：使用ActionMethodSelectorAttribute会导致忽略HttpPostAttribute

以下属性用于限制对ajax请求使用操作：

public class AjaxRequestAttribute : ActionMethodSelectorAttribute
{
    public override bool IsValidForRequest(ControllerContext controllerContext,System.Reflection.MethodInfo methodInfo)
    {
        return controllerContext.HttpContext.Request.IsAjaxRequest();
    }
}

我定义了以下控制器操作方法：

[AjaxRequest]
public ActionResult Login()
{
     ...
}

[HttpPost,AjaxRequest]
public ActionResult Login(LoginModel model,string returnUrl)
{
    ...
}

制作ajax帖子时发生以下错误：

The current request for action ‘Login’ on controller type
‘AgentController’ is ambiguous between the following action methods:
System.Web.Mvc.ActionResult Login() on type
NappWebsiteMvc.Controllers.AgentController System.Web.Mvc.ActionResult
Login(NappWebsiteMvc.Models.Agent.LoginModel,System.String) on type
NappWebsiteMvc.Controllers.AgentController

使用附加属性时似乎忽略了HttpPost属性.如果我从这两个方法中删除AjaxRequest属性,那么代码就可以了.

什么应该是正确的实施？谢谢！

解决方法

按照Pawel的要求,这里是代码：

public class AjaxGetAttribute : ActionMethodSelectorAttribute
{
    public override bool IsValidForRequest(ControllerContext controllerContext,MethodInfo methodInfo)
    {
        var isHttpGet = new AcceptVerbsAttribute(HttpVerbs.Get).IsValidForRequest(controllerContext,methodInfo);
        return isHttpGet && controllerContext.HttpContext.Request.IsAjaxRequest();
    }
}

public class AjaxPostAttribute : ActionMethodSelectorAttribute
{
    public override bool IsValidForRequest(ControllerContext controllerContext,MethodInfo methodInfo)
    {
        var isHttpPost = new AcceptVerbsAttribute(HttpVerbs.Post).IsValidForRequest(controllerContext,methodInfo);
        return isHttpPost && controllerContext.HttpContext.Request.IsAjaxRequest();
    }
}