ASP.NET MVC5.错误代码不允许在浏览器中查看控制器

<system.web>
  <customErrors mode="On" defaultRedirect="~/Error">
    <error statusCode="404" redirect="~/Error/NotFound"/>
  </customErrors>
</system.web>

<customErrors mode="Off"/>

[Authorize(Roles = "Admin")]
public class MyController : Controller
{
    // 控制器方法
}

protected void Application_Error(object sender, EventArgs e)
{
    Exception exception = Server.GetLastError();
    // 记录错误日志
    // 可以选择性地重新抛出异常以在浏览器中显示详细信息
    Server.ClearError();
}

[Authorize(Roles = "Admin")]
public class HomeController : Controller
{
    public ActionResult Index()
    {
        return View();
    }

    [AllowAnonymous]
    public ActionResult Error()
    {
        return View();
    }
}

<system.web>
  <customErrors mode="Off"/>
</system.web>