ClientScriptManager.GetPostBackEventReference Metodo

public:
 System::String ^ GetPostBackEventReference(System::Web::UI::Control ^ control, System::String ^ argument, bool registerForEventValidation);

public string GetPostBackEventReference (System.Web.UI.Control control, string argument, bool registerForEventValidation);

member this.GetPostBackEventReference : System.Web.UI.Control * string * bool -> string

Public Function GetPostBackEventReference (control As Control, argument As String, registerForEventValidation As Boolean) As String

Parametri

Restituisce

Stringa che, quando viene trattata come script nel client, avvia il postback.

Eccezioni

Commenti

Per implementare l'interfaccia per un Pageoggetto , usare la IPostBackEventHandler@ Implements direttiva .

Il GetPostBackEventReference metodo può essere usato con il Button controllo quando la UseSubmitBehavior proprietà è false. In questo scenario, il GetPostBackEventReference metodo restituisce l'evento di postback client per il Button controllo.

Se registerForEventValidation è true, il GetPostBackEventReference(PostBackOptions, Boolean) metodo chiama il metodo per registrare il RegisterForEventValidation(String, String) riferimento all'evento per la convalida con un ID controllo univoco che rappresenta il controllo client che genera l'evento.

Vedi anche

• PostBackOptions
• IPostBackEventHandler
• Callback client senza postback nelle pagine di ASP.NET

public:
 System::String ^ GetPostBackEventReference(System::Web::UI::PostBackOptions ^ options, bool registerForEventValidation);

public string GetPostBackEventReference (System.Web.UI.PostBackOptions options, bool registerForEventValidation);

member this.GetPostBackEventReference : System.Web.UI.PostBackOptions * bool -> string

Public Function GetPostBackEventReference (options As PostBackOptions, registerForEventValidation As Boolean) As String

Parametri

Restituisce

Stringa che, quando viene trattata come script sul client, avvia il postback client.

Eccezioni

Commenti

Per implementare l'interfaccia per un Page oggetto, usare la IPostBackEventHandler@ Implements direttiva .

Il GetPostBackEventReference metodo può essere usato con il Button controllo quando la UseSubmitBehavior proprietà è false. In questo scenario, il GetPostBackEventReference metodo restituisce l'evento di postback client per il Button controllo.

Se registerForEventValidation è true, il GetPostBackEventReference(PostBackOptions, Boolean) metodo chiama il metodo per registrare il RegisterForEventValidation(String, String) riferimento all'evento per la convalida con un ID controllo univoco che rappresenta il controllo client che genera l'evento.

Vedi anche

• PostBackOptions
• IPostBackEventHandler
• Button
• Callback client senza postback nelle pagine di ASP.NET

public:
 System::String ^ GetPostBackEventReference(System::Web::UI::PostBackOptions ^ options);

public string GetPostBackEventReference (System.Web.UI.PostBackOptions options);

member this.GetPostBackEventReference : System.Web.UI.PostBackOptions -> string

Public Function GetPostBackEventReference (options As PostBackOptions) As String

Parametri

Restituisce

Stringa che, quando viene trattata come script sul client, avvia il postback client.

Eccezioni

Commenti

Per implementare l'interfaccia per un Pageoggetto , usare la IPostBackEventHandler@ Implements direttiva .

Il GetPostBackEventReference metodo può essere usato con il Button controllo quando la UseSubmitBehavior proprietà è false. In questo scenario, il GetPostBackEventReference metodo restituisce l'evento di postback client per il Button controllo.

Vedi anche

• PostBackOptions
• IPostBackEventHandler
• Button
• Callback client senza postback nelle pagine di ASP.NET

public:
 System::String ^ GetPostBackEventReference(System::Web::UI::Control ^ control, System::String ^ argument);

public string GetPostBackEventReference (System.Web.UI.Control control, string argument);

member this.GetPostBackEventReference : System.Web.UI.Control * string -> string

Public Function GetPostBackEventReference (control As Control, argument As String) As String

Parametri

Restituisce

Stringa che, quando viene trattata come script nel client, avvia il postback.

Eccezioni

Esempio

Nell'esempio di codice seguente viene illustrato l'uso GetPostBackEventReference del metodo. Il controllo personalizzato, MyControl, implementa l'interfaccia IPostBackEventHandler . Quando si fa clic sul pulsante nella pagina, viene richiamato il RaisePostBackEvent metodo del controllo personalizzato.

<%@ Page Language="C#"  %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">

  public class MyControl : Label, IPostBackEventHandler
  {

    // Use the constructor to defined default label text.
    public MyControl()
    {
      base.Text = "No postback raised.";
    }
    
    // Implement the RaisePostBackEvent method from the
    // IPostBackEventHandler interface. 
    public void RaisePostBackEvent(string eventArgument)
    {
      base.Text = "Postback handled by " + this.ID.ToString() + ". <br/>" +
                  "Postback caused by " + eventArgument.ToString() + ".";
      
    }
  }

  protected void Page_Load(object sender, EventArgs e)
  {
    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = Page.ClientScript;

    // Create an instance of the custom label control and 
    // add it to the page.
    MyControl mycontrol = new MyControl();
    mycontrol.ID = "mycontrol1";
    PlaceHolder1.Controls.Add(mycontrol);
    PlaceHolder1.Controls.Add(new LiteralControl("<br/>"));
    
    // Create a button element with its onClick attribute defined
    // to create a postback event reference to the custom label control.
    HtmlInputButton b = new HtmlInputButton();
    b.ID = "mybutton1";
    b.Value = "Click";
    b.Attributes.Add("onclick", cs.GetPostBackEventReference(mycontrol, b.ID.ToString()));
    PlaceHolder1.Controls.Add(b);
    PlaceHolder1.Controls.Add(new LiteralControl("<br/>"));
    
    // Create a link element with its href attribute defined
    // to create a postback event reference to the custom label control.
    HtmlAnchor a = new HtmlAnchor();
    a.ID = "myanchor1";
    a.InnerText = "link";
    a.HRef = cs.GetPostBackClientHyperlink(mycontrol, a.ID.ToString());
    PlaceHolder1.Controls.Add(a);
  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>ClientScriptManager Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:PlaceHolder id="PlaceHolder1" 
                       runat="server">
      </asp:PlaceHolder>
    </div>
    </form>
</body>
</html>

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
  
  Public Class MyControl
    Inherits Label
    Implements IPostBackEventHandler
     
    Public Sub New()
      
      MyBase.Text = "No postback raised."
    
    End Sub
    
    Public Sub RaisePostBackEvent(ByVal eventArgument As String) Implements System.Web.UI.IPostBackEventHandler.RaisePostBackEvent
      
      MyBase.Text = "Postback handled by " & Me.ID.ToString() & ". <br/>" & _
                "Postback caused by " + eventArgument.ToString() & "."

    End Sub
    
  End Class
   

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    ' Get a ClientScriptManager reference from the Page class.
    Dim cs As ClientScriptManager = Page.ClientScript

    ' Create an instance of the custom label control and 
    ' add it to the page.
    Dim mycontrol As New MyControl()
    MyControl.ID = "mycontrol1"
    PlaceHolder1.Controls.Add(MyControl)
    PlaceHolder1.Controls.Add(New LiteralControl("<br/>"))
    
    ' Create a button element with its onClick attribute defined
    ' to create a postback event reference to the custom label control.
    Dim b As New HtmlInputButton()
    b.ID = "mybutton1"
    b.Value = "Click"
    b.Attributes.Add("onclick", cs.GetPostBackEventReference(MyControl, b.ID.ToString()))
    PlaceHolder1.Controls.Add(b)
    PlaceHolder1.Controls.Add(New LiteralControl("<br/>"))
    
    ' Create a link element with its href attribute defined
    ' to create a postback event reference to the custom label control.
    Dim a As New HtmlAnchor()
    a.ID = "myanchor1"
    a.InnerText = "link"
    a.HRef = cs.GetPostBackClientHyperlink(MyControl, a.ID.ToString())
    PlaceHolder1.Controls.Add(a)
    
  End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>ClientScriptManager Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:PlaceHolder id="PlaceHolder1" 
                       runat="server">
      </asp:PlaceHolder>
    </div>
    </form>
</body>
</html>

L'esempio di codice seguente ha la stessa funzionalità della precedente, ad eccezione del fatto che invece di un controllo personalizzato, la Page classe implementa l'interfaccia IPostBackEventHandler .

<%@ Page Language="C#"  %>
<%@ Implements Interface="System.Web.UI.IPostBackEventHandler" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
  
  public void RaisePostBackEvent(string eventArgument)
  {
    Label1.Text = "Postback handled by " + this.ID.ToString() + ". <br/>" +
                  "Postback caused by " + eventArgument.ToString() + "."; ;
  }
  
  protected void Page_Load(object sender, EventArgs e)
  {
    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = Page.ClientScript;
    
    // Create a button element with its onClick attribute defined
    // to create a postback event reference to the custom label control.
    HtmlInputButton b = new HtmlInputButton();
    b.ID = "mybutton1";
    b.Value = "Click";
    b.Attributes.Add("onclick", cs.GetPostBackEventReference(this, b.ID.ToString()));
    PlaceHolder1.Controls.Add(b);
    PlaceHolder1.Controls.Add(new LiteralControl("<br/>"));
    
    // Create a link element with its href attribute defined
    // to create a postback event reference to the custom label control.
    HtmlAnchor a = new HtmlAnchor();
    a.ID = "myanchor1";
    a.InnerText = "link";
    a.HRef = cs.GetPostBackClientHyperlink(this, a.ID.ToString());
    PlaceHolder1.Controls.Add(a);
  }
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>ClientScriptManager Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:Label id="Label1"
                 runat="server" />
      <br />
      <asp:PlaceHolder id="PlaceHolder1" 
                       runat="server">
      </asp:PlaceHolder>
    </div>
    </form>
</body>
</html>

<%@ Page Language="VB" %>
<%@ Implements Interface="System.Web.UI.IPostBackEventHandler" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<script runat="server">
 
  Public Sub RaisePostBackEvent(ByVal eventArgument As String) _
    Implements IPostBackEventHandler.RaisePostBackEvent
    
    Label1.Text = "Postback handled by " & Me.ID.ToString() & ". <br/>" & _
           "Postback caused by " + eventArgument.ToString() & "."
  
  End Sub
  

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)

    ' Get a ClientScriptManager reference from the Page class.
    Dim cs As ClientScriptManager = Page.ClientScript
    
    ' Create a button element with its onClick attribute defined
    ' to create a postback event reference to the custom label control.
    Dim b As New HtmlInputButton()
    b.ID = "mybutton1"
    b.Value = "Click"
    b.Attributes.Add("onclick", cs.GetPostBackEventReference(Me, b.ID.ToString()))
    PlaceHolder1.Controls.Add(b)
    PlaceHolder1.Controls.Add(New LiteralControl("<br/>"))
    
    ' Create a link element with its href attribute defined
    ' to create a postback event reference to the custom label control.
    Dim a As New HtmlAnchor()
    a.ID = "myanchor1"
    a.InnerText = "link"
    a.HRef = cs.GetPostBackClientHyperlink(Me, a.ID.ToString())
    PlaceHolder1.Controls.Add(a)
    
  End Sub
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>ClientScriptManager Example</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
      <asp:Label id="Label1"
                 runat="server" />
      <br />
      <asp:PlaceHolder id="PlaceHolder1" 
                       runat="server">
      </asp:PlaceHolder>
    </div>
    </form>
</body>
</html>

Commenti

Per implementare l'interfaccia per un Pageoggetto , usare la IPostBackEventHandler@ Implements direttiva .

Il GetPostBackEventReference metodo può essere usato con il Button controllo quando la UseSubmitBehavior proprietà è false. In questo scenario, il GetPostBackEventReference metodo restituisce l'evento di postback client per il Button controllo.

Vedi anche

• PostBackOptions
• IPostBackEventHandler
• Callback client senza postback nelle pagine di ASP.NET