Repeater.OnBubbleEvent(Object, EventArgs) Metodo

Riferimento

Definizione

Spazio dei nomi:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Importante

Alcune informazioni sono relative alla release non definitiva del prodotto, che potrebbe subire modifiche significative prima della release definitiva. Microsoft non riconosce alcuna garanzia, espressa o implicita, in merito alle informazioni qui fornite.

Genera l'evento ItemCommand se il parametro EventArgs è un'istanza dell'oggetto RepeaterCommandEventArgs.

protected:
 override bool OnBubbleEvent(System::Object ^ sender, EventArgs ^ e);

protected override bool OnBubbleEvent (object sender, EventArgs e);

override this.OnBubbleEvent : obj * EventArgs -> bool

Protected Overrides Function OnBubbleEvent (sender As Object, e As EventArgs) As Boolean

Parametri

sender: Object

Origine dell'evento.

e: EventArgs

Oggetto EventArgs che contiene i dati dell'evento.

Restituisce

Boolean

true se è stato generato l'evento ItemCommand; in caso contrario false.

Esempio

Nell'esempio di codice seguente viene illustrato come eseguire l'override del OnDataBinding metodo in un controllo server personalizzato in modo che, se l'argomento dell'evento è un tipo di comando, il Repeater controllo chiama sempre l'evento OnItemCommand e viene generato o restituito false e annullato l'evento.

<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
  <head>
    <title>Custom Repeater - OnBubbleEvent - C# Example</title>
    <script language="C#" runat="server">
      void Page_Load(Object Sender, EventArgs e) 
      {
        if (!IsPostBack) 
        {
          ArrayList values = new ArrayList();
          values.Add(new PositionData("Microsoft", "Msft"));
          values.Add(new PositionData("Intel", "Intc"));
          values.Add(new PositionData("Dell", "Dell"));

          Repeater1.DataSource = values;
          Repeater1.DataBind();
        }
      }

      public class PositionData 
      {
        private string name;
        private string ticker;

        public PositionData(string name, string ticker) 
        {
          this.name = name;
          this.ticker = ticker;
        }

        public string Name 
        {
          get 
          {
            return name;
          }
        }

        public string Ticker 
        {
          get 
          {
            return ticker;
          }
        }
      }
    </script>
  </head>
  <body>
    <form id="Form1" method="post" runat="server">
      <h3>Custom Repeater - OnBubbleEvent - C# Example</h3>
      <aspSample:CustomRepeaterOnBubbleEvent id="Repeater1" runat="server">
        <HeaderTemplate>
          <table border="1" cellpadding="4" cellspacing="0">
            <tr>
              <th>Company</th>
              <th>Symbol</th>
            </tr>
        </HeaderTemplate>
        <ItemTemplate>
          <tr>
            <td> <%# DataBinder.Eval(Container.DataItem, "Name") %></td>
            <td> <%# DataBinder.Eval(Container.DataItem, "Ticker") %></td>
          </tr>
        </ItemTemplate>
        <FooterTemplate>
            </table>
        </FooterTemplate>
      </aspSample:CustomRepeaterOnBubbleEvent>
    </form>
  </body>
</html>

<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Controls" Assembly="Samples.AspNet.VB" %>
<%@ Page Language="VB" AutoEventWireup="True" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
    <head>
        <title>Custom Repeater - OnBubbleEvent - VB.NET Example</title>
        <script language="VB" runat="server">
            Sub Page_Load(Sender As Object, e As EventArgs)
                If Not IsPostBack Then
                    Dim values As New ArrayList()
                    
                    values.Add(New PositionData("Microsoft", "Msft"))
                    values.Add(New PositionData("Intel", "Intc"))
                    values.Add(New PositionData("Dell", "Dell"))
                    
                    Repeater1.DataSource = values
                    Repeater1.DataBind()
                End If
            End Sub

            Public Class PositionData
                
                Private myName As String
                Private myTicker As String        
                
                Public Sub New(newName As String, newTicker As String)
                    Me.myName = newName
                    Me.myTicker = newTicker
                End Sub        
                
                Public ReadOnly Property Name() As String
                    Get
                        Return myName
                    End Get
                End Property        
                
                Public ReadOnly Property Ticker() As String
                    Get
                        Return myTicker
                    End Get
                End Property
            End Class
        </script>
    </head>
    <body>
        <form id="Form1" method="post" runat="server">
            <h3>Custom Repeater - OnBubbleEvent - VB.NET Example</h3>
            
            <aspSample:CustomRepeaterOnBubbleEvent id="Repeater1" runat="server" >
                    <HeaderTemplate>
                        <table border="1" cellpadding="4" cellspacing="0">
                            <tr>
                                <th>Company</th>
                                <th>Symbol</th>
                            </tr>
                    </HeaderTemplate>
                    <ItemTemplate>
                        <tr>
                            <td> <%# DataBinder.Eval(Container.DataItem, "Name") %></td>
                            <td> <%# DataBinder.Eval(Container.DataItem, "Ticker") %></td>
                        </tr>
                    </ItemTemplate>
                    <FooterTemplate>
                        </table>
                    </FooterTemplate>
                </aspSample:CustomRepeaterOnBubbleEvent>
        </form>
    </body>
</html>

using System.Web;
using System.Security.Permissions;

namespace Samples.AspNet.CS.Controls
{
  [AspNetHostingPermission(SecurityAction.Demand, Level=AspNetHostingPermissionLevel.Minimal)]
  public sealed class CustomRepeaterOnBubbleEvent : System.Web.UI.WebControls.Repeater
  {
    protected override bool OnBubbleEvent(object source, System.EventArgs args)
    {
      // If the EventArgs are of type RepeaterCommandEventArgs,
      // then call the OnItemCommand event handler and return true (bubble up the event)
      // else return false (don't bubble up the event).
      bool isHandled = false;
      if (args is System.Web.UI.WebControls.RepeaterCommandEventArgs) 
      {
        this.OnItemCommand((System.Web.UI.WebControls.RepeaterCommandEventArgs)args);
        isHandled = true;
      }
      return isHandled;
    }
  }
}

Imports System.Web
Imports System.Security.Permissions

Namespace Samples.AspNet.VB.Controls
    <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
    Public NotInheritable Class CustomRepeaterOnBubbleEvent
        Inherits System.Web.UI.WebControls.Repeater

        Protected Overrides Function OnBubbleEvent(ByVal [source] As Object, ByVal args As System.EventArgs) As Boolean

            ' If the EventArgs are of type RepeaterCommadnEventArgs,
            ' then call the OnItemCommand event handler and return true (bubble up the event)
            ' else return false (don't bubble up the event).
            Dim isHandled As Boolean = False
            If TypeOf args Is System.Web.UI.WebControls.RepeaterCommandEventArgs Then
                Me.OnItemCommand(CType(args, System.Web.UI.WebControls.RepeaterCommandEventArgs))
                isHandled = True
            End If
            Return isHandled
        End Function
    End Class
End Namespace

Si applica a

Vedi anche

Cenni preliminari sul controllo server Web Repeater

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