Control.DataBinding Zdarzenie

Odwołanie

Definicja

Przestrzeń nazw:: System.Web.UI

Zestaw:: System.Web.dll

Ważne

Niektóre informacje odnoszą się do produktu w wersji wstępnej, który może zostać znacząco zmodyfikowany przed wydaniem. Firma Microsoft nie udziela żadnych gwarancji, jawnych lub domniemanych, w odniesieniu do informacji podanych w tym miejscu.

Występuje, gdy kontrolka serwera wiąże się ze źródłem danych.

public:
 event EventHandler ^ DataBinding;

public event EventHandler DataBinding;

member this.DataBinding : EventHandler

Public Custom Event DataBinding As EventHandler

Typ zdarzenia

EventHandler

Przykłady

/* 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

Uwagi

To zdarzenie powiadamia kontrolkę serwera o wykonaniu dowolnej logiki powiązania danych, która została dla niej zapisana.

Dotyczy

Produkt	Wersje
.NET Framework	1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1

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