Control.DataBinding Evento

Referência

Definição

Namespace:: System.Web.UI

Assembly:: System.Web.dll

Importante

Algumas informações se referem a produtos de pré-lançamento que podem ser substancialmente modificados antes do lançamento. A Microsoft não oferece garantias, expressas ou implícitas, das informações aqui fornecidas.

Ocorre quando o controle de servidor é associado a uma fonte de dados.

public:
 event EventHandler ^ DataBinding;

public event EventHandler DataBinding;

member this.DataBinding : EventHandler

Public Custom Event DataBinding As EventHandler

Tipo de evento

EventHandler

Exemplos

/* Create a class that implements the ITemplate interface.
   This class overrides the InstantiateIn method to always
   place templates in a Literal object. It also creates a 
   custom BindData method that is used as the event handler
   associated with the Literal object's DataBinding event.  
*/
  
using System;
using System.Web;
using System.Data;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace UsingItemTemplates
{
    public class GenericItem : ITemplate
    {
        private string column;
      
        public GenericItem(string column)
        {
            this.column = column;
        }

        // Override the ITemplate.InstantiateIn method to ensure 
        // that the templates are created in a Literal control and
        // that the Literal object's DataBinding event is associated
        // with the BindData method.
        public void InstantiateIn(Control container)
        {
            Literal l = new Literal();
            l.DataBinding += new EventHandler(this.BindData);
            container.Controls.Add(l);
        }
        // Create a public method that will handle the
        // DataBinding event called in the InstantiateIn method.
        public void BindData(object sender, EventArgs e)
        {
            Literal l = (Literal) sender;
            DataGridItem container = (DataGridItem) l.NamingContainer;
            l.Text = ((DataRowView) container.DataItem)[column].ToString();
        }
    }
}

' Create a class that implements the ITemplate interface.
' This class overrides the InstantiateIn method to always
' place templates in a Literal object. It also creates a 
' custom BindData method that is used as the event handler
' associated with the Literal object's DataBinding event.  

Imports System.Web
Imports System.Data
Imports System.Web.UI
Imports System.Web.UI.WebControls


Namespace UsingItemTemplatesVB

 Public Class GenericItem
   Implements ITemplate 

   Private column As String
   
   Public Sub New(column As String)
      Me.column = column
   End Sub
   
   
   ' Override the ITemplate.InstantiateIn method to ensure 
   ' that the templates are created in a Literal control and
   ' that the Literal object's DataBinding event is associated
   ' with the BindData method.
   Public Sub InstantiateIn(container As Control) Implements ITemplate.InstantiateIn
      Dim l As New Literal()
      AddHandler l.DataBinding, AddressOf Me.BindData
      container.Controls.Add(l)
   End Sub
   
   ' Create a public method that will handle the
   ' DataBinding event called in the InstantiateIn method.
   Public Sub BindData(sender As Object, e As EventArgs)
      Dim l As Literal = CType(sender, Literal)
      Dim container As DataGridItem = CType(l.NamingContainer, DataGridItem)
      l.Text = CType(container.DataItem, DataRowView)(column).ToString()
   End Sub
 End Class
End Namespace 'UsingItemTemplatesVB

Comentários

Esse evento notifica o controle do servidor para executar qualquer lógica de associação de dados que tenha sido gravada para ele.

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