在ASP.NET MVC中提供favicon.ico

protected void Application_Start()
{
    AreaRegistration.RegisterAllAreas();
    FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
    RouteConfig.RegisterRoutes(RouteTable.Routes);
    BundleConfig.RegisterBundles(BundleTable.Bundles);

    // 添加以下代码
    RouteTable.Routes.MapRoute(
        name: "favicon",
        url: "favicon.ico",
        defaults: new { controller = "Content", action = "Favicon" }
    );
}

public class ContentController : Controller
{
    [HttpGet]
    public ActionResult Favicon()
    {
        return File("~/Content/favicon.ico", "image/x-icon");
    }
}