The controller's action is ambiguous between the action of the baseclass with same name.

The current request for action 'Index' on controller type ContactController is ambiguous between the following action methods:

System.Web.Mvc.ActionResult Index() on type RX.Web.Controllers.ContactController
System.Web.Mvc.ActionResult Index() on type RX.Web.Controllers.CustomControllerBase2[[RX.Core.Model.Contact, RXTechJob.Core, Version=1.0.0.0, Culture=neutral, PublicKeyT开发者_如何学编程oken=null],[System.Int32, mscorlib, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089]] 

The Contact Controller:

        public virtual new ActionResult Index()
    {
        return base.Index();
    }

The base Controller:

        public virtual ActionResult Index()
    {

        return View("Index", SelectAll());

    }

Why this happen? How to fix it? Thanks!

You are creating a second method called index that MVC does not know how to handle. see here for a discussion on virtual new creating an additional not overriding method.

Instead for your contact controller consider something along the line of:

public override ActionResult Index() {
        return base.Index();
}

Thanks for your answer.

Because stackoverflow did not recognise my Gooogle OpenID,so i create a new account and come back again :)

I can not use "override" because i am using T4MVC .

So i fix it like this:

base controller(replace "public" with "protected"):

        protected virtual ActionResult Index()
    {

        return View("Index", SelectAll());

    }

contact controller:

        public virtual new ActionResult Index()
    {
        return base.Index();
    }

In the T4MVC auto generated code it can be overrided:

        public override System.Web.Mvc.ActionResult Index() {
        var callInfo = new T4MVC_ActionResult(Area, Name, Actions.Index);
        return callInfo;
    }

Seemingly, everything works fine now. :)