{"id":567,"date":"2008-09-09T09:32:40","date_gmt":"2008-09-09T09:32:40","guid":{"rendered":"http:\/\/osmeusapontamentos.com\/?p=567"},"modified":"2008-09-09T09:32:40","modified_gmt":"2008-09-09T09:32:40","slug":"aspnet-page-flow-user-controls","status":"publish","type":"post","link":"https:\/\/osmeusapontamentos.com\/index.php\/2008\/09\/09\/aspnet-page-flow-user-controls\/","title":{"rendered":"asp.net page flow (user controls)"},"content":{"rendered":"<p>cen\u00e1rio:<br \/>\naspx que faz o render de todas as outras p\u00e1ginas, ali\u00e1s System.Web.UI.UserControl<br \/>\nmain.aspx<br \/>\n&#8211; userControl.ascx<br \/>\n&#8212; componenteExistente.ascx<\/p>\n<p>em vez da sequ\u00eancia PreInit, Init, InitComplete, PreLoad, Load, LoadComplete, SaveStateComplete, PreRender, PreRenderComplete de uma aspx tradicional temos uma sequencia bem mais curta de Init, Load e PreRender.<br \/>\nPara al\u00e9m de perceber a sequ\u00eancia dos eventos precisava de saber tamb\u00e9m como \u00e9 que os userControls interagiam entre si. Basicamente a sequencia de eventos entre userControls funciona \u00e9:<\/p>\n<ul>\n<li>de baixo para cima &#8211; os userControls que estiverem definidos no topo da p\u00e1gina s\u00e3o processados primeiro<\/li>\n<li>antes do load de fora para dentro &#8211; no caso de haver &#8220;nested&#8221; controls s\u00e3o processados primeiro os userControls que estiverem no nivel hierarquico mais baixo<\/li>\n<li>a partir do load de dentro para fora<\/li>\n<li>em sequ\u00eancia de eventos &#8211; os eventos de um mesmo tipo s\u00e3o todos processados em sequencia, ou seja primeiro processam-se todos os Inits, depois todos os Loads e assim sucessivamente.<\/li>\n<li>o processamento dos eventos dos controlos de uma p\u00e1gina, por exemplo Button.Click s\u00e3o feitos depois do Load<\/li>\n<\/ul>\n<p><img decoding=\"async\" style=\"border:1px solid black\" src=\"https:\/\/osmeusapontamentos.com\/img\/aspnet_usercontrol_flow.png\" alt=\"\" width=\"500\" \/><br \/>\nAlguns pormenores a ter em conta:<\/p>\n<ul>\n<li>todos os objectos (System.Web.UI.Control) que forem criados dinamicamente t\u00eam que ser recriados a cada postback, preferencialmente no evento Init<\/li>\n<li>as propriedades de um objecto s\u00e3o populadas automaticamente na passagem do Init para o Load do userControl respectivo. um pormenor a ter em aten\u00e7\u00e3o \u00e9 que isto aplica-se quer a objectos j\u00e1 existentes na p\u00e1gina quer aos criados dinamicamente desde que mantenham o mesmo nome.<\/li>\n<li>o viewstate s\u00f3 fica disponivel no load<\/li>\n<\/ul>\n<p>curiosamente, e ao contr\u00e1rio do que eu pensava, nada disto tem a ver com o viewstate o que se pode comprovar fazendo um trace h\u00e1 execu\u00e7\u00e3o da p\u00e1gina e verificando o estado dobjecto viewstate. Para mais informa\u00e7\u00e3o ver o artigo: <a href=\"http:\/\/aspalliance.com\/articleViewer.aspx?aId=135&amp;pId=\">ViewState: All You Wanted to Know <\/a><\/p>\n<p>Outro pormenor interessante \u00e9 a utiliza\u00e7\u00e3o de vari\u00e1veis est\u00e1ticas (static \/ shared) que basicamente persistem o seu valor entre postbacks e est\u00e3o logo disponiveis no primeiro evento &#8211; Init.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>cen\u00e1rio: aspx que faz o render de todas as outras p\u00e1ginas, ali\u00e1s System.Web.UI.UserControl main.aspx &#8211; userControl.ascx &#8212; componenteExistente.ascx em vez da sequ\u00eancia PreInit, Init, InitComplete, PreLoad, Load, LoadComplete, SaveStateComplete, PreRender, PreRenderComplete de uma aspx tradicional temos uma sequencia bem mais curta de Init, Load e PreRender. Para al\u00e9m de perceber a sequ\u00eancia dos eventos precisava [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[70,538],"class_list":["post-567","post","type-post","status-publish","format-standard","hentry","category-ler-ver-ouvir-passear","tag-aspnet","tag-programar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>asp.net page flow (user controls) - Os Meus Apontamentos<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/osmeusapontamentos.com\/index.php\/2008\/09\/09\/aspnet-page-flow-user-controls\/\" \/>\n<meta property=\"og:locale\" content=\"pt_PT\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"asp.net page flow (user controls) - Os Meus Apontamentos\" \/>\n<meta property=\"og:description\" content=\"cen\u00e1rio: aspx que faz o render de todas as outras p\u00e1ginas, ali\u00e1s System.Web.UI.UserControl main.aspx &#8211; userControl.ascx &#8212; componenteExistente.ascx em vez da sequ\u00eancia PreInit, Init, InitComplete, PreLoad, Load, LoadComplete, SaveStateComplete, PreRender, PreRenderComplete de uma aspx tradicional temos uma sequencia bem mais curta de Init, Load e PreRender. 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