ClientScriptManager.GetPostBackEventReference Método

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

Parâmetros

Retornos

Uma cadeia de caracteres que, quando tratada como script no cliente, inicia o postback.

Exceções

Comentários

Para implementar a IPostBackEventHandler interface para um Page, use a @ Implements diretiva.

O GetPostBackEventReference método pode ser usado com o Button controle quando a UseSubmitBehavior propriedade é false. Nesse cenário, o GetPostBackEventReference método retorna o evento de postback do cliente para o Button controle.

Se registerForEventValidation for true, o GetPostBackEventReference(PostBackOptions, Boolean) método chamará o RegisterForEventValidation(String, String) método para registrar a referência de evento para validação com uma ID de controle exclusiva que representa o controle do cliente que está gerando o evento.

Confira também

• PostBackOptions
• IPostBackEventHandler
• Retornos de chamada do cliente sem postbacks em páginas 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

Parâmetros

Retornos

Uma cadeia de caracteres que, quando tratada como script no cliente, inicia o postback do cliente.

Exceções

Comentários

Para implementar a IPostBackEventHandler interface de um Page objeto, use a @ Implements diretiva.

O GetPostBackEventReference método pode ser usado com o Button controle quando a UseSubmitBehavior propriedade é false. Nesse cenário, o GetPostBackEventReference método retorna o evento de postback do cliente para o Button controle.

Se registerForEventValidation for true, o GetPostBackEventReference(PostBackOptions, Boolean) método chamará o RegisterForEventValidation(String, String) método para registrar a referência de evento para validação com uma ID de controle exclusiva que representa o controle do cliente que está gerando o evento.

Confira também

• PostBackOptions
• IPostBackEventHandler
• Button
• Retornos de chamada do cliente sem postbacks em páginas 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

Parâmetros

Retornos

Uma cadeia de caracteres que, quando tratada como script no cliente, inicia o postback do cliente.

Exceções

Comentários

Para implementar a IPostBackEventHandler interface para um Page, use a @ Implements diretiva.

O GetPostBackEventReference método pode ser usado com o Button controle quando a UseSubmitBehavior propriedade é false. Nesse cenário, o GetPostBackEventReference método retorna o evento de postback do cliente para o Button controle.

Confira também

• PostBackOptions
• IPostBackEventHandler
• Button
• Retornos de chamada do cliente sem postbacks em páginas 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

Parâmetros

Retornos

Uma cadeia de caracteres que, quando tratada como script no cliente, inicia o postback.

Exceções

Exemplos

O exemplo de código a seguir demonstra o uso do GetPostBackEventReference método. O controle MyControlpersonalizado implementa a IPostBackEventHandler interface. Quando o botão na página é clicado, o RaisePostBackEvent método do controle personalizado é invocado.

<%@ 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>

O exemplo de código a seguir tem a mesma funcionalidade que a anterior, exceto que, em vez de um controle personalizado, a Page classe implementa a IPostBackEventHandler interface.

<%@ 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>

Comentários

Para implementar a IPostBackEventHandler interface para um Page, use a @ Implements diretiva.

O GetPostBackEventReference método pode ser usado com o Button controle quando a UseSubmitBehavior propriedade é false. Nesse cenário, o GetPostBackEventReference método retorna o evento de postback do cliente para o Button controle.

Confira também

• PostBackOptions
• IPostBackEventHandler
• Retornos de chamada do cliente sem postbacks em páginas ASP.NET