{"id":658,"date":"2008-09-25T14:33:11","date_gmt":"2008-09-25T14:33:11","guid":{"rendered":"http:\/\/osmeusapontamentos.com\/?p=658"},"modified":"2008-09-25T14:33:11","modified_gmt":"2008-09-25T14:33:11","slug":"aspnet-page-flow-user-controls-2","status":"publish","type":"post","link":"https:\/\/osmeusapontamentos.com\/index.php\/2008\/09\/25\/aspnet-page-flow-user-controls-2\/","title":{"rendered":"asp.net page flow (user controls) #2"},"content":{"rendered":"<p>A prop\u00f3sito do artigo <a href=\"https:\/\/osmeusapontamentos.com\/?p=567\">asp.net page flow (user controls)<\/a>, um colega aqui do meu departamento na <a href=\"http:\/\/www.primaverabss.com\">Primavera<\/a> alertou-me (e bem) do eventual perigo da utiliza\u00e7\u00e3o da vari\u00e1veis est\u00e1ticas.<\/p>\n<p>Onde eu dizia &#8220;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.&#8221;<\/p>\n<p>Deveria ter dito: Naturalmente as vari\u00e1veis est\u00e1ticas (static \/ shared) mant\u00eam o seu valor entre postbacks precisamente pelo facto de serem est\u00e1ticas e por isso n\u00e3o implicarem a cria\u00e7\u00e3o de uma nova inst\u00e2ncia. Ao fim e ao cabo \u00e9 o padr\u00e3o singleton em ac\u00e7\u00e3o. No caso do ASP.Net, como tudo corre dentro do mesmo processo isto quase que se traduz numa esp\u00e9cie de variavel do tipo Application.<\/p>\n<p>alguns links:<a href=\"http:\/\/msdn.microsoft.com\/en-us\/library\/ms973875.aspx\"><\/a><\/p>\n<p><a href=\"http:\/\/msdn.microsoft.com\/en-us\/library\/ms973875.aspx\">Shared Variables in Classes<\/a> &#8211; A shared variable is created just once for any objects that are declared of a certain class type.<br \/>\n<a href=\"http:\/\/www.velocityreviews.com\/forums\/showpost.php?s=edcdbde9044ad0ac81c9e36ae0d130fa&amp;p=481922&amp;postcount=9\">Persistent to a client action (postback) in ASPNET<\/a> are<br \/>\nA viewstate item (belongs to the page)<br \/>\nA session item (belongs as IIS part to the client)<br \/>\nA shared variable (belongs to the application)<br \/>\nA cache item (is used by the total application)<\/p>\n<p>When you <a href=\"http:\/\/forums.thedailywtf.com\/forums\/p\/9357\/176768.aspx#176768\">store data in a static variable<\/a>, the data is available to all users on the entire AppDomain. If you need a single instance of some object per user, put it in the Session instead.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A prop\u00f3sito do artigo asp.net page flow (user controls), um colega aqui do meu departamento na Primavera alertou-me (e bem) do eventual perigo da utiliza\u00e7\u00e3o da vari\u00e1veis est\u00e1ticas. Onde eu dizia &#8220;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 [&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-658","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) #2 - 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\/25\/aspnet-page-flow-user-controls-2\/\" \/>\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) #2 - Os Meus Apontamentos\" \/>\n<meta property=\"og:description\" content=\"A prop\u00f3sito do artigo asp.net page flow (user controls), um colega aqui do meu departamento na Primavera alertou-me (e bem) do eventual perigo da utiliza\u00e7\u00e3o da vari\u00e1veis est\u00e1ticas. Onde eu dizia &#8220;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 [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/osmeusapontamentos.com\/index.php\/2008\/09\/25\/aspnet-page-flow-user-controls-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Os Meus Apontamentos\" \/>\n<meta property=\"article:published_time\" content=\"2008-09-25T14:33:11+00:00\" \/>\n<meta name=\"author\" content=\"Vitor Silva\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@vitorsilva\" \/>\n<meta name=\"twitter:site\" content=\"@vitorsilva\" \/>\n<meta name=\"twitter:label1\" content=\"Escrito por\" \/>\n\t<meta name=\"twitter:data1\" content=\"Vitor Silva\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo estimado de leitura\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minuto\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/09\\\/25\\\/aspnet-page-flow-user-controls-2\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/09\\\/25\\\/aspnet-page-flow-user-controls-2\\\/\"},\"author\":{\"name\":\"Vitor Silva\",\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/#\\\/schema\\\/person\\\/d508df9c3ffc8b4e64a18dbf0ba18dd8\"},\"headline\":\"asp.net page flow (user controls) #2\",\"datePublished\":\"2008-09-25T14:33:11+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/09\\\/25\\\/aspnet-page-flow-user-controls-2\\\/\"},\"wordCount\":252,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/#\\\/schema\\\/person\\\/d508df9c3ffc8b4e64a18dbf0ba18dd8\"},\"keywords\":[\"asp.net\",\"programar\"],\"articleSection\":[\"Ler\\\/ Ver\\\/ Ouvir\\\/ Passear\"],\"inLanguage\":\"pt-PT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/09\\\/25\\\/aspnet-page-flow-user-controls-2\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/09\\\/25\\\/aspnet-page-flow-user-controls-2\\\/\",\"url\":\"https:\\\/\\\/osmeusapontamentos.com\\\/index.php\\\/2008\\\/09\\\/25\\\/aspnet-page-flow-user-controls-2\\\/\",\"name\":\"asp.net page flow (user controls) #2 - 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