ASP.NET MVC Internals
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The document discusses ASP.NET MVC internals including routing, controllers, views, and view engines. It explains how requests come to controllers through routing and routing handlers. It also describes how controllers execute actions and return results, and how view engines render views using view engines and templates. The document provides examples of customizing routing handlers, controllers, dependency injection, and view engines in ASP.NET MVC.
![require
'rack'
app
=
Proc.new
do
|env|
#
ENV
HASH
[
'200',
#
HTTP
CODE
{'Content-‐Type'
=>
'text/html'},
['A
barebones
rack
app.’]
#
BODY
]
end
Rack::Handler::WEBrick.run
app
MIDDLEWARE](https://image.slidesharecdn.com/gosharpvbaum-150301035808-conversion-gate02/85/ASP-NET-MVC-Internals-17-320.jpg)
![CONTROLLER
[HttpPost,
ActionName("Delete")]
public
async
Task<ActionResult>
DeleteConfirmed(int
id)
{
var
album
=
await
_storeContext.Albums.FindAsync(id);
if
(album
==
null)
{
return
HttpNotFound();
}
_storeContext.Albums.Remove(album);
await
_storeContext.SaveChangesAsync();
return
RedirectToAction("Index");
}](https://image.slidesharecdn.com/gosharpvbaum-150301035808-conversion-gate02/85/ASP-NET-MVC-Internals-31-320.jpg)
![CONTROLLER
[HttpPost,
ActionName("Delete")]
public
async
Task<ActionResult>
DeleteConfirmed(int
id)
{
var
removed
=
await
_albumService.Remove(id);
return
Status.NotFound
==
removed.Status
?
HttpNotFound()
:
RedirectToAction(“Index");
}](https://image.slidesharecdn.com/gosharpvbaum-150301035808-conversion-gate02/85/ASP-NET-MVC-Internals-32-320.jpg)
![{{#repo}}
<b>{{name}}</b>
{{/repo}}
{
"repo": [
{ "name": "resque" },
{ "name": "hub" },
{ "name": "rip" }
]
}
<b>resque</b>
<b>hub</b>
<b>rip</b>+ =
YET ANOTHER TEMPLATE](https://image.slidesharecdn.com/gosharpvbaum-150301035808-conversion-gate02/85/ASP-NET-MVC-Internals-43-320.jpg)
ASP.NET MVC Internals
- 1. Vitaly Baum @butaji ASP.NET MVC Internals
- 2. > whoami Vitaly Baum Product Manager @ bright box [email protected] http://twitter.com/butaji BACKGROUND
- 3. ▪Web Application ▪MVC ▪What and How ▪Controller ▪How do I write Controllers? ▪How do requests come to Controller? ▪View ▪How does ViewEngine render views? ▪Why do I need to change ViewEngine? AGENDA
- 4. QUESTIONS • Non-IIS • Azure in production • NoSQL • NGINX
- 5. OK. MVC
- 6. MVC • Front Controller An object that handles all requests • Page Controller An object that handles a request for a specific page or action on a Web site
- 7. HTTP
- 8. HTTP 1. Request 2. Environment 3. Response
- 9. IIS • System.Web.dll • IHttpHandler (extensions) • IHttpModule (HttpApplication events)
- 10. using System; using System.Web; public class LoggingHttpModule : IHttpModule { public void Dispose() {} public void Init(HttpApplication context) { context.BeginRequest += BeginRequest; } void BeginRequest(object sender, EventArgs e) { Logger.Instance.Log("Hi there!"); } }
- 11. public class RequestHandler : IHttpHandler { public RequestHandler() { } public bool IsReusable { get { return false; } } public void ProcessRequest(HttpContext context) { context.Response.ContentType = "application/json"; context.Response.Write("{ id : 1 }"); } }
- 12. ASP.NET MVC? • Were implemented on HttpHandlers • https://servicestack.net/features • http://www.castleproject.org/projects/monorail/ • http://mvc.fubu-project.org
- 13. IIS + ASP.NET • Highly coupled • Hard to manage (ain’t my job) • New features only with OS updates
- 14. a. Web Server b. Middleware c. Application SERVER INTEROP
- 15. • authentication • cookies • authorization • output caching • localisation • request servicing (app) MIDDLEWARE
- 16. SERVER INTEROP • Rack (ruby) • WSGI (Python) • Node.js • OWIN (.NET)
- 17. require 'rack' app = Proc.new do |env| # ENV HASH [ '200', # HTTP CODE {'Content-‐Type' => 'text/html'}, ['A barebones rack app.’] # BODY ] end Rack::Handler::WEBrick.run app MIDDLEWARE
- 18. var http = require('http'); var server = http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'text/plain'}); res.end('Hello Worldn'); }) server.listen(1337, '127.0.0.1'); MIDDLEWARE
- 19. var express = require('express') var app = express() app.use(function (req, res, next) { console.log('Time:', Date.now()); next(); }); MIDDLEWARE
- 20. //OWIN Implementation using AppFunc = Func< IDictionary<string, object>, Task >; MIDDLEWARE
- 21. OWIN public class Startup { public void Configuration(IAppBuilder app) { app.Run(context => { return context .Response.WriteAsync("Hi OWIN/Katana"); }); } }
- 22. ASP.NET MVC
- 23. ASP.NET MVC LIFECYCLE Routing UrlRoutingModule -> IRouteHandler -> IHttpHandler Controller Execute -> Filters -> Model Binding -> Action Action Your Code Result Views -> TypeFormater
- 24. ROUTE HANDLER public class MyRouteHandler : IRouteHandler { public IHttpHandler GetHttpHandler( RequestContext requestContext) { var handler = new MyMVCHandler(); handler.RequestContext = requestContext; return handler; } }
- 25. ROUTE HANDLER • In case of dynamic routes • CMS • Blog with custom Slugs
- 26. MVC HANDLER public class MyMVCHandler : MvcHandler { protected override void ProcessRequest(IHttpContext httpContext) { var controllerName = GetRequiredString(this.RequestContext.RouteData, "controller"); var controller = CreateController(controllerName); var controllerContext = new ControllerContext(base.RequestContext, controller); controller.Execute(controllerContext); } private IController CreateController(string controllerName) { return _controllerFactory.Create(controllerName); } }
- 27. DEPENDENCY MGMT public class CustomControllerFactory : IControllerFactory { public IController CreateController(RequestContext requestContext, string name) { return _serviceLocator.Resolve<IController>(name); } }
- 28. DEPENDENCY MGMT //ASP.NET vNext has new way to inject dependencies public class Startup { public void Configure(IBuilder app) { var services = new ServiceCollection(); services.AddTransient<IMessageGenerator, HelloMessageGenerator>(); app.UseMiddleware(typeof(ContainerMiddleware)); } }
- 29. OK. CTRL
- 31. CONTROLLER [HttpPost, ActionName("Delete")] public async Task<ActionResult> DeleteConfirmed(int id) { var album = await _storeContext.Albums.FindAsync(id); if (album == null) { return HttpNotFound(); } _storeContext.Albums.Remove(album); await _storeContext.SaveChangesAsync(); return RedirectToAction("Index"); }
- 32. CONTROLLER [HttpPost, ActionName("Delete")] public async Task<ActionResult> DeleteConfirmed(int id) { var removed = await _albumService.Remove(id); return Status.NotFound == removed.Status ? HttpNotFound() : RedirectToAction(“Index"); }
- 33. CONTROLLER //vNext can host POCOs controllers public List<Data> GetData() { return null; //will return 204 (NoContent) }
- 34. def {action_name}( {params} ) app_res = {domain_service}.{call}( {params} ) return app_res end
- 35. OK. VIEW
- 36. SEO OF SPA
- 38. Middleware Application GET / User-Agent: Chrome GET / User-Agent: Google JSON
- 39. Middleware Application GET / User-Agent: Google GET / User-Agent: Chrome HTML
- 40. SEO OF SPA SHARED TEMPLATES
- 43. {{#repo}} <b>{{name}}</b> {{/repo}} { "repo": [ { "name": "resque" }, { "name": "hub" }, { "name": "rip" } ] } <b>resque</b> <b>hub</b> <b>rip</b>+ = YET ANOTHER TEMPLATE
- 44. VIEW ENGINE public interface IViewEngine { ViewEngineResult FindPartialView(ControllerContext ctx, string name, bool useCache); ViewEngineResult FindView(ControllerContext ctx, string viewName, string masterName, bool useCache); void ReleaseView(ControllerContext ctx, IView view); } public interface IView { void Render(ViewContext ctx, TextWriter writer); } http://buildstarted.com/2013/12/16/javascript-view-engine-for-aspnet/
- 45. VIEW ENGINE services.AddMvc().Configure<MvcOptions>( options => { options.ViewEngines.Add( new MyCustomerViewEngine ()); });
- 46. COVERED TOPICS ▪Web Application ▪MVC ▪What and How ▪Controller ▪How do I write Controllers? ▪How do requests come to Controller? ▪View ▪How does ViewEngine render views? ▪Why do I need to change ViewEngine?