ASP.NET MVC3 Custom ErrorPages 500/404

Global.aspx.cs

public static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    filters.Add(new CustomHandlerErrorAttribute());
}

CustomHandlerErrorAttribute.cs

public class CustomHandlerErrorAttribute : HandleErrorAttribute
{
    public override void OnException(ExceptionContext filterContext)
    {
        if (filterContext.ExceptionHandled)
        {
            return;
        }

        filterContext.Controller.ViewData.Model = filterContext.Exception;

        filterContext.Result = new ViewResult
        {
            ViewName = "Error",
            ViewData = filterContext.Controller.ViewData
        };

        filterContext.ExceptionHandled = true;
    }
}

web.config <system.web>

<customErrors mode="On">
  <error redirect="/home/error" statusCode="404" />
</customErrors>

web.config  <system.webServer>

<httpErrors errorMode="Custom" existingResponse="PassThrough">
</httpErrors>

Error.cshtml

<div class="box">
    @{

        var exception = ViewData.Model;
        var statusCode = exception == null ? 404 : 500;
        Response.StatusCode = statusCode;
        if (statusCode == 404)
        {
            <h3>404 Page not found!</h3>
            <p>没有找到该网页!</p>
        }
        else if (statusCode == 500)
        {
            <h3>500 程序异常</h3>
            <p>@exception.Message</p>
        }
    }
    <p style="font-size: 12px; color: Gray">请使用浏览器的后退功能已保证您填写的数据没有丢失！</p>
</div>