{"id":28901,"date":"2019-03-26T00:00:00","date_gmt":"2019-03-25T23:00:00","guid":{"rendered":"https:\/\/blexin.com\/?p=28901"},"modified":"2021-01-13T09:40:41","modified_gmt":"2021-01-13T08:40:41","slug":"kestrel-lanciami-i-componenti","status":"publish","type":"post","link":"https:\/\/blexin.com\/it\/blog\/kestrel-lanciami-i-componenti\/","title":{"rendered":"Kestrel, lanciami i componenti!"},"content":{"rendered":"\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"608\" data-attachment-id=\"28902\" data-permalink=\"https:\/\/blexin.com\/it\/blog\/kestrel-lanciami-i-componenti\/attachment\/053fe30c-dd90-42a6-9036-c1a5269a7f43\/\" data-orig-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/053fe30c-dd90-42a6-9036-c1a5269a7f43.png?fit=1024%2C608&amp;ssl=1\" data-orig-size=\"1024,608\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"053fe30c-dd90-42a6-9036-c1a5269a7f43\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/053fe30c-dd90-42a6-9036-c1a5269a7f43.png?fit=1024%2C608&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/053fe30c-dd90-42a6-9036-c1a5269a7f43.png?resize=1024%2C608&#038;ssl=1\" alt=\"\" class=\"wp-image-28902\" srcset=\"https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/053fe30c-dd90-42a6-9036-c1a5269a7f43.png 1024w, https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/053fe30c-dd90-42a6-9036-c1a5269a7f43-980x582.png 980w, https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/053fe30c-dd90-42a6-9036-c1a5269a7f43-480x285.png 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Durante il lavoro di porting effettuato sul nostro CMS &#8220;WebRight&#8221; da ASP.NET MVC 5.0 a ASP.NET Core, mi sono imbattuto in un bel problema: la gestione delle widget di WebRight. Infatti, queste\u00a0erano gestite utilizzando delle Partial View che venivano renderizzate all&#8217;interno delle view tramite l&#8217;helper\u00a0<strong>HTML.RenderAction<\/strong>. Purtroppo, quest&#8217;ultimo non \u00e8 pi\u00f9 utilizzabile in ASP.NET Core.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Niente paura comunque:&nbsp;per gestire questi casi d&#8217;uso, ASP.NET Core introduce i View Components, ovvero una nuova feature che permette di renderizzare HTML da una pagina Razor. Questi sono generati da una classe C# che estende la classe base&nbsp;<strong>ViewComponent<\/strong>, e sono tipicamente associati ad un file Razor per generare il markup che ci serve.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">L&#8217;idea \u00e8 di raccontarvi come scrivere dei View Component,&nbsp;usando Visual Studio 2017 e ASP.NET CORE, e come poi abbiamo portato questa nuova funzionalit\u00e0 in WebRight.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il primo passo \u00e8 creare una nuova Web Application ASP.NET CORE<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"956\" height=\"663\" data-attachment-id=\"28905\" data-permalink=\"https:\/\/blexin.com\/it\/blog\/kestrel-lanciami-i-componenti\/attachment\/nuovo_progetto\/\" data-orig-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuovo_progetto.png?fit=956%2C663&amp;ssl=1\" data-orig-size=\"956,663\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Nuovo_progetto\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuovo_progetto.png?fit=956%2C663&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuovo_progetto.png?resize=956%2C663&#038;ssl=1\" alt=\"\" class=\"wp-image-28905\" srcset=\"https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuovo_progetto.png 956w, https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuovo_progetto-480x333.png 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 956px, 100vw\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Quando ci viene chiesto il tipo di Web App da creare, scegliamo\u00a0<strong>Applicazione Web<\/strong>, che ci creer\u00e0 un semplice website utilizzando le nuove ASP.NET Core Razor pages.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"797\" height=\"563\" data-attachment-id=\"28907\" data-permalink=\"https:\/\/blexin.com\/it\/blog\/kestrel-lanciami-i-componenti\/attachment\/nuova_applicazione_web_core\/\" data-orig-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuova_applicazione_web_Core.png?fit=797%2C563&amp;ssl=1\" data-orig-size=\"797,563\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Nuova_applicazione_web_Core\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuova_applicazione_web_Core.png?fit=797%2C563&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuova_applicazione_web_Core.png?resize=797%2C563&#038;ssl=1\" alt=\"\" class=\"wp-image-28907\" srcset=\"https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuova_applicazione_web_Core.png 797w, https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/Nuova_applicazione_web_Core-480x339.png 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 797px, 100vw\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Il template scelto crea per noi una struttura di cartelle ben definita, all&#8217;interno della quale\u00a0c&#8217;\u00e8 la directory\u00a0<strong>Pages<\/strong>. In questa creeremo una sottocartella dove\u00a0saranno presenti i nostri View Component.\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"434\" data-attachment-id=\"28910\" data-permalink=\"https:\/\/blexin.com\/it\/blog\/kestrel-lanciami-i-componenti\/attachment\/scaffolding_progetto_web\/\" data-orig-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Scaffolding_progetto_web.png?fit=640%2C434&amp;ssl=1\" data-orig-size=\"640,434\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Scaffolding_progetto_web\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Scaffolding_progetto_web.png?fit=640%2C434&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Scaffolding_progetto_web.png?resize=640%2C434&#038;ssl=1\" alt=\"\" class=\"wp-image-28910\" srcset=\"https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/Scaffolding_progetto_web.png 640w, https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/Scaffolding_progetto_web-480x326.png 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 640px, 100vw\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Creiamo a questo punto una cartella\u00a0<strong>TestViewComponent,<\/strong>\u00a0che conterr\u00e0 un file C# e una Razor View Page che andranno a comporre il nostro View Component, e che chiameremo TestViewComponent.cs e Default.cshtml:\u00a0<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"335\" height=\"402\" data-attachment-id=\"28912\" data-permalink=\"https:\/\/blexin.com\/it\/blog\/kestrel-lanciami-i-componenti\/attachment\/file_viewcomponent\/\" data-orig-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/file_viewcomponent.png?fit=335%2C402&amp;ssl=1\" data-orig-size=\"335,402\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"file_viewcomponent\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/file_viewcomponent.png?fit=335%2C402&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/file_viewcomponent.png?resize=335%2C402&#038;ssl=1\" alt=\"\" class=\"wp-image-28912\" srcset=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/file_viewcomponent.png?w=335&amp;ssl=1 335w, https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/file_viewcomponent.png?resize=250%2C300&amp;ssl=1 250w\" sizes=\"auto, (max-width: 335px) 100vw, 335px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Implementiamo il nostro View Component (la nostra classe base), che avr\u00e0 un costruttore vuoto e un methodo Invoke con solo un parametro.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\nusing Microsoft.AspNetCore.Mvc;\n\u00a0\nnamespace ViewComponentsExample.Pages.Components.TestViewComponent\n{\n\u00a0\u00a0\u00a0\u00a0public class TestViewComponentViewComponent : ViewComponent\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0public TestViewComponentViewComponent() { }\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0public IViewComponentResult Invoke(string nome)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return View(&quot;Default&quot;, nome);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0}\n}\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">La nostra view Razor sar\u00e0 molto semplice, formata da solo due righe di codice. La prima ci dice di che tipo sar\u00e0 il modello che verr\u00e0 passato alla view, e la seconda renderizzer\u00e0 il modello in un tag h2<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\n@model string\n&lt;h2&gt;@Model&lt;\/h2&gt;\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">A questo punto abbiamo un View Component completo. Per utilizzarlo, possiamo usare una pagina Razor, proprio come facevamo con\u00a0<strong>HTML.RenderAction<\/strong>, quindi creiamo una nuova Razor View che chiamiamo\u00a0<strong>TestViewComponentPage<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"584\" height=\"441\" data-attachment-id=\"28915\" data-permalink=\"https:\/\/blexin.com\/it\/blog\/kestrel-lanciami-i-componenti\/attachment\/nuova_page\/\" data-orig-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/nuova_page.png?fit=584%2C441&amp;ssl=1\" data-orig-size=\"584,441\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"nuova_page\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/nuova_page.png?fit=584%2C441&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/nuova_page.png?resize=584%2C441&#038;ssl=1\" alt=\"\" class=\"wp-image-28915\" srcset=\"https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/nuova_page.png 584w, https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/nuova_page-480x362.png 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 584px, 100vw\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Possiamo visualizzare il nostro View Component in due modi: il primo consiste nel richiamare la classe con il metodo&nbsp;<strong>InvokeAsync<\/strong>&nbsp;e il secondo \u00e8 un tag HTML custom.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Il primo metodo che vediamo \u00e8\u00a0<strong>InvokeAsync<\/strong>: a questo dobbiamo passare in input un primo parametro con il nome del component (nome della classe senza il suffisso ViewComponent) e il secondo parametro \u00e8 un tipo anonimo. Questa \u00e8 la nostra pagina completa:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\n@page\n@model ViewComponentsExample.Pages.TestViewComponentPageModel\n\u00a0\n&lt;body&gt;\n\u00a0\u00a0\u00a0\u00a0&lt;h1&gt;Demo component Async&lt;\/h1&gt;\n\u00a0\u00a0\u00a0\u00a0@await Component.InvokeAsync(&quot;TestViewComponent&quot;, new {\n\u00a0\u00a0\u00a0\u00a0nome = &quot;Mio primo componente&quot;\n\u00a0\u00a0\u00a0\u00a0})\n&lt;\/body&gt;\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Se avviamo l&#8217;applicazione, ecco il risultato di quanto scritto fino ad ora:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"508\" data-attachment-id=\"28917\" data-permalink=\"https:\/\/blexin.com\/it\/blog\/kestrel-lanciami-i-componenti\/attachment\/demo_view_async\/\" data-orig-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Demo_view_async.png?fit=1531%2C760&amp;ssl=1\" data-orig-size=\"1531,760\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"Demo_view_async\" data-image-description=\"\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Demo_view_async.png?fit=1024%2C508&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/blexin.com\/wp-content\/uploads\/2020\/12\/Demo_view_async.png?resize=1024%2C508&#038;ssl=1\" alt=\"\" class=\"wp-image-28917\" srcset=\"https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/Demo_view_async-980x486.png 980w, https:\/\/blexin.com\/wp-content\/uploads\/2020\/12\/Demo_view_async-480x238.png 480w\" sizes=\"auto, (min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) 1024px, 100vw\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Come gi\u00e0 anticipato,&nbsp;esiste un altro modo per poter utilizzare i View Component all&#8217;interno delle nostre pagine Razor: possiamo creare un tag HTML custom da inserire nella pagina, funzionalit\u00e0 di ASP.NET Core che \u00e8 chiamata&nbsp;<em>Tag Helpers<\/em>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diamo uno sguardo a come utilizzare i Tag Helper per invocare il nostro View Component. Ecco di seguito come cambia la nostra pagina Razor rispetto alla precedente.<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\n@page\n@model ViewComponentsExample.Pages.TestViewComponentPageModel\n\u00a0\n@addTagHelper *, ViewComponentsExample\n&lt;!DOCTYPE html&gt;\n&lt;html&gt;\n&lt;head&gt;\n\u00a0\u00a0\u00a0\u00a0&lt;meta name=&quot;viewport&quot; content=&quot;width=device-width&quot; \/&gt;\n\u00a0\u00a0\u00a0\u00a0&lt;title&gt;Demo component con Tag helper&lt;\/title&gt;\n&lt;\/head&gt;\n&lt;body&gt;\n\u00a0\u00a0\u00a0\u00a0&lt;h1&gt;Demo component con Tag helper&lt;\/h1&gt;\n\u00a0\u00a0\u00a0\u00a0&lt;vc:test-view-component nome=&quot;mio componente con tag helper&quot;&gt;\n\u00a0\u00a0\u00a0\u00a0&lt;\/vc:test-view-component&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Tutto quello che ho dovuto fare \u00e8 stato aggiungere la riga&nbsp;<strong>@addTagHelper*, ViewComponentsExample<\/strong>&nbsp;che semplicemente dice di utilizzare tutti i Tag Helper definiti ovunque nel mio assembly. A questo punto, posso referenziare il mio component nel body HTML con il prefisso&nbsp;<strong>vc per i view component<\/strong>. Il nome del tag non \u00e8 altro che il nome del nostro View Component diviso in Kebab casing (test-view-component). La parte migliore di questo approccio \u00e8&nbsp;che non ho dovuto fare alcuna modifica al codice della mia classe per permettere al Tag Helper di funzionare!<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Come abbiamo usato tutto questo in\u00a0<strong>WebRight<\/strong>? La nostra precedente implementazione\u00a0gestiva le widget direttamente dal controller unico presente nel core dell&#8217;applicazione, utilizzando questo semplice codice:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\n&#x5B;HttpGet]\n&#x5B;Route(&quot;widget\/{widget_name}&quot;, Name = &quot;WebRightWidgetDefaultGet&quot;)]\npublic PartialViewResult Widget(string widget_name, WebRightWidgetArguments arguments)\n{\n\u00a0\u00a0\u00a0\u00a0IWebRightWidget widget = this.widgetFactory.GetWidgetByName(widget_name);\n\u00a0\n\u00a0\u00a0\u00a0\u00a0return PartialView(\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0string.Format(&quot;_{0}{1}&quot;, widget_name, arguments.ViewVersionName),\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0widget.GetViewModel(getCurrentCultureName(), arguments.Parameters));\n}\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Questo approccio ci permetteva di scrivere degli html helper, in cui andavamo a specificare il nome della widget da richiamare e passare gli eventuali parametri che potessero servire allo scopo della widget. Ecco un esempio di codice di un helper che richiama la widget del Menu:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\npublic static MvcHtmlString Menu(this HtmlHelper html, string categoryName, string viewVersionName = &quot;&quot;)\n{\n\u00a0\u00a0\u00a0\u00a0return html.Action(\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0&quot;Widget&quot;, \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0&quot;WebRightCms&quot;, \n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0new\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0widget_name = &quot;WebRightMenuWidget&quot;,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0arguments = new WebRightWidgetArguments\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0ViewVersionName = viewVersionName,\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Parameters = new object&#x5B;] { categoryName }\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0});\n}\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Queste due sezioni di codice presentate ci permettevano di renderizzare una widget in modo semplice in qualunque Page della nostra applicazione:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\n@Html.Menu(&quot;mainNavigationMenu&quot;)\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Come abbiamo modificato questo comportamento per utilizzare i nuovi View Component di ASP.NET Core? Di seguito il nostro View Component, che va a sostituire l&#8217;action Widget del controller che vi ho descritto:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\npublic class WidgetViewComponent : ViewComponent\n{\n\u00a0\u00a0\u00a0\u00a0private readonly IWebRightWidgetFactory widgetFactory = null;\n\u00a0\n\u00a0\u00a0\u00a0\u00a0public WidgetViewComponent(IWebRightWidgetFactory wf)\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0this.widgetFactory = wf;\n\u00a0\u00a0\u00a0\u00a0}\n\u00a0\n\u00a0\u00a0\u00a0\u00a0public async Task&lt;IViewComponentResult&gt; InvokeAsync(string name, string culture = null, string viewVersionName = null, object&#x5B;] parameters = null)\n\u00a0\u00a0\u00a0\u00a0{\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0IWebRightWidget widget = this.widgetFactory.GetWidgetByName(name);\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return View($&quot;{name + viewVersionName}&quot;, widget.GetViewModel(culture, parameters));\n\u00a0\u00a0\u00a0\u00a0}\n}\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Come vedete, la classe \u00e8 relativamente semplice: ha un metodo InvokeAsync che viene richiamato con dei parametri (alcuni di questi erano quelli utilizzati sulla action Widget del controller).<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quello che ci manca adesso \u00e8 sostituire l&#8217;utilizzo degli Html Helper. Anche questa modifica risulta abbastanza semplice:\u00a0tutto quello che serve \u00e8 richiamare il metodo InvokeAsync all&#8217;interno di una nostra pagina Razor, in modo da renderizzare la widget che ci serve.\u00a0Ecco un esempio di utilizzo:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\n&lt;h1&gt;TEST PAGE ANCORA&lt;\/h1&gt;\n\u00a0\n@await Component.InvokeAsync(&quot;Widget&quot;, new { name = &quot;TestWidget&quot; })\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Come spiegato precedentemente, preferisco l&#8217;approccio con i TagHelper per renderizzare i ViewComponent.\u00a0Facciamo, quindi, un&#8217;altra piccola modifica alla nostra page, che diventer\u00e0:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\n&lt;h1&gt;TEST PAGE ANCORA&lt;\/h1&gt;\n\u00a0\n&lt;vc:widget name=&quot;TestWidget&quot;&gt;&lt;\/vc:widget&gt;\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Per inizializzare i TagHelper non ho fatto altro che aggiungere questa riga nella pagina Layout dell&#8217;applicazione:<\/p>\n\n\n<div class=\"wp-block-syntaxhighlighter-code \"><pre class=\"brush: csharp; title: ; notranslate\" title=\"\">\n@addTagHelper *, WebRight\n<\/pre><\/div>\n\n\n<p class=\"wp-block-paragraph\">Con questo concludiamo la panoramica sull&#8217;utilizzo dei View Component, spero di aver stimolato la vostra curiosit\u00e0 su questa funzionalit\u00e0 di ASP.NET Core.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Alla prossima!<\/p>\n\n\n\n\n","protected":false},"excerpt":{"rendered":"<p>Convertiamo le Partial View di ASP.NET MVC con i View Component di ASP.NET Core<\/p>\n","protected":false},"author":196716246,"featured_media":28902,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","_coblocks_attr":"","_coblocks_dimensions":"","_coblocks_responsive_height":"","_coblocks_accordion_ie_support":"","_crdt_document":"","inline_featured_image":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"_wpas_customize_per_network":false,"jetpack_post_was_ever_published":false},"categories":[688637374],"tags":[688637414,688637441],"class_list":["post-28901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-asp-net-core","tag-webright"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Kestrel, lanciami i componenti! 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