在IIS预热步骤中预加载ASP.NET MVC视图

Question

我最近开始利用IIS的能力,通过使用IProcessHostPreloadClient界面将热身步骤应用到我的Web应用程序(请查看此处获取有关如何设置此内容的指导).这很好,或者至少我认为它确实如此,因为我所做的一个"聪明"的事情是尝试通过迭代我的控制器并渲染它们来预加载我的视图.

经过一些试验和错误,我得到了它的工作,一切都很顺利.也就是说,直到我注意到我的系统的所有验证都不再有效,无论是客户端还是服务器验证.我假设当MVC第一次检索视图时,验证通常会连接到视图,但我没有这样做.有没有人知道如何将其包含在我的解决方案中或者以其他方式完成？

代码:

public class Warmup : IProcessHostPreloadClient
{
    public void Preload(string[] parameters)
    {
        //Pre-render all views
        AutoPrimeViewCache("QASW.Web.Mvc.Controllers", @"Views\");
        AutoPrimeViewCache("QASW.Web.Mvc.Areas.Api.Controllers", @"Areas\Api\Views\", "Api");
    }

    private void AutoPrimeViewCache(string controllerNamespace, string relativeViewPath, string area = null)
    {
        var controllerTypes = typeof(Warmup).Assembly.GetTypes().Where(t => t.Namespace == controllerNamespace && (t == typeof(Controller) || t.IsSubclassOf(typeof(Controller))));
        var controllers = controllerTypes.Select(t => new { Instance = (Controller)Activator.CreateInstance(t), Name = t.Name.Remove("Controller") });

        foreach (var controller in controllers)
        {
            var viewPath = Path.Combine(HostingEnvironment.ApplicationPhysicalPath, relativeViewPath + controller.Name);
            var viewDir = new DirectoryInfo(viewPath);
            if (viewDir.Exists)
            {
                var viewNames = viewDir.EnumerateFiles("*.cshtml").Select(f => f.Name.Remove(".cshtml")).ToArray();
                PreloadController(controller.Instance, area, viewNames);
            }
        }
    }

    private void PreloadController(Controller controller, string area, params string[] views)
    {
        var viewEngine = new RazorViewEngine();

        var controllerName = controller.GetType().Name.Remove("Controller");
        var http = new HttpContextWrapper(new HttpContext(new HttpRequest(null, "http://a.b.com", null), new HttpResponse(TextWriter.Null)));
        var routeDescription = area == null ? "{controller}/{action}/{id}" : area + "/{controller}/{action}/{id}";
        var route = new RouteCollection().MapRoute(
            "Default", // Route name
            routeDescription, // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );

        var routeData = new RouteData(route, route.RouteHandler);
        routeData.Values.Add("controller", controllerName);
        if (area != null)
        {
            routeData.Values.Add("area", area);
            routeData.DataTokens.Add("area", area);
        }
        routeData.DataTokens.Add("controller", controllerName);
        routeData.Values.Add("id", 1);
        routeData.DataTokens.Add("id", 1);
        var controllerContext = new ControllerContext(http, routeData, controller);
        var vDic = new ViewDataDictionary();
        var vTemp = new TempDataDictionary();

        foreach (var view in views)
        {
            var viewResult = viewEngine.FindView(controllerContext, view, null, false);
            if (viewResult.View == null)
                throw new ArgumentException("View not found: {0} (Controller: {1})".Args(view, controllerName));
            var viewContext = new ViewContext(controllerContext, viewResult.View, vDic, vTemp, TextWriter.Null);
            try { viewResult.View.Render(viewContext, TextWriter.Null); }
            catch { }
        }
    }
}

Answer 1

问题不在于问题中的代码，而在于执行它的时间。将代码移至操作中使我能够毫无问题地执行预热步骤。就我而言，我想我只会在系统配置完成后调用安装过程来调用预热操作。