Control.DataBinding 事件
定义
重要
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当服务器控件绑定到数据源时发生。
public:
event EventHandler ^ DataBinding;public event EventHandler DataBinding;member this.DataBinding : EventHandler Public Custom Event DataBinding As EventHandler 事件类型
示例
/* 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
注解
此事件通知服务器控件执行已为其编写的任何数据绑定逻辑。
