GridView动态添加模板列(VB.NET版)

最新推荐文章于 2024-08-24 17:36:28 发布

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本文介绍如何在ASP.NET中使用GridView控件动态添加模板列，并为模板列中的控件添加点击事件。通过示例代码展示了创建数据源、设置模板字段及事件处理的过程。

GridView动态添加模板列这个case 经常会遇到，网上相关资料也不少，

但是关于如何动态为添加在模板列中的控件添加事件却没有。本文就是为解决这种情况而写。

代码如下:

GridViewTemplateDemoVB.aspx

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="GridViewTemplateDemoVB.aspx.vb" Inherits="GridView_GridViewTemplateDemoVB" %> <!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 runat="server"> <title>GridView动态添加模板列的例子</title> </head> <body> <form id="form1" runat="server"> <asp:gridview ID="gv" AutoGenerateColumns="false" runat="server"></asp:gridview> </form> </body> </html>

GridViewTemplateDemoVB.aspx.vb

Imports System.Data Partial Class GridView_GridViewTemplateDemoVB Inherits System.Web.UI.Page Private Function CreateDataSource() As ICollection Dim dt As New DataTable() Dim dr As DataRow dt.Columns.Add(New DataColumn("id", GetType(Int32))) dt.Columns.Add(New DataColumn("Name", GetType(String))) For i As Integer = 0 To 5 dr = dt.NewRow() dr(0) = i dr(1) = "Name" & i.ToString() dt.Rows.Add(dr) Next Return dt.DefaultView End Function Protected Overloads Overrides Sub OnInit(ByVal e As EventArgs) Dim customField As New TemplateField() customField.ShowHeader = True customField.HeaderTemplate = New GridViewTemplate(DataControlRowType.Header, "动态添加列") Dim gvt As New GridViewTemplate(DataControlRowType.DataRow, "lbtn", "Name") AddHandler gvt.eh, AddressOf lbtn_Click customField.ItemTemplate = gvt gv.Columns.Add(customField) MyBase.OnInit(e) End Sub Protected Sub lbtn_Click(ByVal sender As Object, ByVal e As System.EventArgs) ' do sth Response.Write("PageLoad: lbtn_Click") End Sub Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load If Not IsPostBack Then gv.DataSource = CreateDataSource() gv.DataBind() End If End Sub End Class Public Class GridViewTemplate Implements ITemplate Public Delegate Sub EventHandler(ByVal sender As Object, ByVal e As EventArgs) Public Event eh As EventHandler Private templateType As DataControlRowType Private columnName As String Private controlID As String Public Sub New(ByVal type As DataControlRowType, ByVal colname As String) templateType = type columnName = colname End Sub Public Sub New(ByVal type As DataControlRowType, ByVal controlID As String, ByVal colname As String) templateType = type Me.controlID = controlID columnName = colname End Sub Sub RaiseSampleEvent(ByVal sender As Object, ByVal e As EventArgs) RaiseEvent eh(sender, e) End Sub Sub InstantiateIn(ByVal container As Control) Implements ITemplate.InstantiateIn Select Case templateType Case DataControlRowType.Header Dim lc As New Literal() lc.Text = columnName container.Controls.Add(lc) Exit Select Case DataControlRowType.DataRow Dim lbtn As New LinkButton() lbtn.ID = Me.controlID If ehEvent IsNot Nothing Then AddHandler lbtn.Click, AddressOf RaiseSampleEvent End If AddHandler lbtn.DataBinding, AddressOf lbtn_DataBinding container.Controls.Add(lbtn) Exit Select Case Else Exit Select End Select End Sub Private Sub lbtn_DataBinding(ByVal sender As Object, ByVal e As EventArgs) Dim lbtn As LinkButton = TryCast(sender, LinkButton) If lbtn IsNot Nothing Then Dim container As GridViewRow = TryCast(lbtn.NamingContainer, GridViewRow) If container IsNot Nothing Then Dim dataValue As Object = DataBinder.Eval(container.DataItem, columnName) If Not IsDBNull(dataValue) Then lbtn.Text = dataValue.ToString() End If End If End If End Sub End Class