ASP.NET Tutorial/Page Lifecycle/Post Back — различия между версиями

Материал из .Net Framework эксперт
Перейти к: навигация, поиск
м (1 версия)
 
(нет различий)

Версия 18:30, 26 мая 2010

Page.IsPostBack (C#)

   <source lang="csharp">

<%@ Page Language="C#" %> <script runat="server"> 

  void Page_Load(Object Sender, EventArgs e) {
     if (!Page.IsPostBack) {
        lblMessage.Text = "Hello world!!!!";
     }
  }
  
  void Submit(Object Sender, EventArgs e) {
     lblMessage2.Text = "Form posted";
  }

</script> <html><body> 

  <form runat="server">
     <asp:Button id="btSubmit" runat="server" Text="Submit" onClick="Submit" />
     
     <asp:Label id="lblMessage" runat=server />
     
     <asp:Label id="lblMessage2" runat=server />
  </form>

</body></html></source>


Save value to view state (VB.net)

   <source lang="csharp">

<%@ Page Language="VB" %> <script runat="server"> 

  Sub Page_Load(Sender as Object, e as EventArgs)
     if not Page.IsPostBack then
        ViewState("StartTime") = DateTime.Now      
        lblMessage.Text = "The time is now: " & _
           ViewState("StartTime")
     end if
  end sub
  
  Sub Submit(obj as object, e as EventArgs)
     lblMessage.Text = "The time is now: " & DateTime.Now & _
        "
started at: " & ViewState("StartTime")
     
  end Sub

</script> <html><body> 

  <form runat="server">
     <asp:Button id="btSubmit" runat="server" Text="Submit"
        onClick="Submit" />
     
     <asp:Label id="lblMessage" runat=server />
  </form>

</body></html></source>

Источник — «http://nfex.ru/index.php?title=ASP.NET_Tutorial/Page_Lifecycle/Post_Back&oldid=3186»