[英]How can I update database records?
我有这样的代码:
[HttpPost]
public static bool AggiornaInstallatore(FormCollection form)
{
using (var ctx = new termostore_installazione_Entities())
{
var idr = Convert.ToInt32(form["id_installatore"]);
var installatore = ctx.installatori.Where(x => x.Id == idr).FirstOrDefault();
var squad = Convert.ToInt16(form["squadra"]);
var squadra = ctx.squadra.Where(x => x.id == squad).FirstOrDefault();
if (form["edit_nome"] != "") { installatore.nome = form["edit_nome"]; }
if (form["edit_cognome"] != "") { installatore.cognome = form["edit_cognome"]; }
if (form["edit_email"] != "") { installatore.mail = form["edit_email"]; }
if (form["edit_telefono"] != "") { installatore.telefono = form["edit_telefono"]; }
if (form["edit_indirizzo"] != "") { installatore.indirizzo = form["edit_indirizzo"]; }
if (form["edit_zona_competenza"] != "") { installatore.zona_competenza = form["edit_zona_competenza"]; }
installatore.squadra.Add(squadra);
ctx.SaveChanges();
}
return true;
}
现在,我不想更新squadra
,而是要更新此记录,但是我不知道该怎么做。
无需将squadra
元素添加到列表中,您可以像这样从db更新对象的每个元素:
//The element you already have in your example
var squadra = ctx.squadra.Where(x => x.id == squad).FirstOrDefault();
squadra.name = form.name; //I assume you get te updated value from form
squadra.type = form.type;
...
ctx.SaveChanges();
您已更新了小队元素,并使用SaveChanges
方法甚至在数据库上也设置了更新。
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