在使用DataGrid时，有时候需要表头跨列、多行，下面的代码就是实现这个功能的代码。
查看例子
ShowColSpanHeader.ASPx
<%@ Page Language="<a href="http://dev.21tx.com/language/vb/" target="_blank">VB</a>" AutoEventWireup="false" Codebehind="ShowColSpanHeader.aspx.vb"
Inherits="aspx<a href="http://dev.21tx.com/web/" target="_blank">Web</a>.mengxianhui.com.ShowColSpanHeader"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML>
<HEAD>
<title id="lucky_elove" runat=server></title>
<meta name="GENERATOR" content="Microsoft Visual Studio<a href="http://dev.21tx.com/dotnet/" target="_blank">.net</a> 7.0">
<meta name="CODE_LANGUAGE" content="Visual Basic 7.0">
<meta name="vs_defaultClientScript" content="<a href="http://dev.21tx.com/web/javascript/" target="_blank">JavaScript</a>">
<meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout" leftmargin="0">
<form id="Form1" method="post" runat="server">
<TABLE id="Table1" runat="server" cellSpacing="1" cellPadding="2" width="780" border="1"
bgcolor="#cc6633" bordercolor="#cc9966" style="FONT-SIZE:9pt;BORDER-BOTTOM:0px">
<TR align="center">
<TD colspan="2" width="580"></TD>
<TD width="200" colspan="2"></TD>
</TR>
<TR align="center">
<TD width="400" bgcolor="#66cc99"></TD>
<TD width="180" bgcolor="white"></TD>
<TD width="160" bgcolor="#99cccc"></TD>
<TD width="40" bgcolor="#009999"></TD>
</TR>
</TABLE>
<asp:DataGrid id="DataGrid1" width="780px" AlternatingItemStyle-BackColor="#6699ff"
CellPadding="2" CellSpacing="1" BorderWidth="1" BorderColor="#cc9966" Font-Size="9pt"
runat="server" ShowHeader="False" AutoGenerateColumns="False">
<Columns>
<asp:BoundColumn DataField="Title">
<ItemStyle Width="400px"></ItemStyle>
</asp:BoundColumn>
<asp:BoundColumn DataField="CreateDate">
<ItemStyle Width="180px"></ItemStyle>
</asp:BoundColumn>
<asp:BoundColumn DataField="pid">
<ItemStyle Width="160px"></ItemStyle>
</asp:BoundColumn>
<asp:BoundColumn DataField="HitCount">
<ItemStyle Width="40px"></ItemStyle>
</asp:BoundColumn>
</Columns>
</asp:DataGrid>
</form>
</body>
</HTML>
ShowColSpanHeader.aspx.vb
Imports System
Imports System.Data
Imports System.Data.OleDb
Public Class ShowColSpanHeader
Inherits System.Web.UI.Page
Protected WithEvents Table1 As System.Web.UI.HtmlControls.HtmlTable
Protected WithEvents DataGrid1 As System.Web.UI.WebControls.DataGrid
Protected WithEvents lucky_elove As HtmlControls.HtmlGenericControl
#Region " Web Form Designer Generated Code "
'This call is required by the Web Form Designer.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
End Sub
Private Sub Page_Init(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles MyBase.Init
'CODEGEN: This method call is required by the Web Form Designer
'Do not modify it using the code editor.
InitializeComponent()
End Sub
#End Region
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) _
Handles MyBase.Load
lucky_elove.InnerText = "【孟宪会之精彩世界】 - 跨栏表头的实现"
Table1.Rows(0).Cells(0).InnerText = "【孟宪会之精彩世界】.NET版本之最新文章"
Table1.Rows(0).Cells(1).InnerText = "文章信息"
Table1.Rows(1).Cells(0).InnerText = "文章标题"
Table1.Rows(1).Cells(1).InnerText = "发布时间"
Table1.Rows(1).Cells(2).InnerText = "所属栏目"
Table1.Rows(1).Cells(3).InnerText = "点击率"
Table1.Rows(0).Style.Add("color", "white")
Table1.Rows(0).Style.Add("font-weight", "bold")
Table1.Rows(0).Cells(0).Attributes.Add("onclick", _
"window.open('http://lucky_elove.www1.dotnetplayground.com/')")
Table1.Rows(0).Cells(0).Style.Add("cursor", "hand")
Try
Dim cnString As String = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" _
+ Server.MapPath("Test.mdb")
Dim cn As New OleDbConnection(cnString)
cn.Open()
Dim strSQL As String = "SELECT TOP 20 D.Title,D.CreateDate,S.Title as pid,D.HitCount "_
+ "FROM Document D INNER JOIN Subject S ON D.pid = S.id ORDER BY CreateDate DESC"
Dim cmd As New OleDbCommand(strSQL, cn)
DataGrid1.DataSource = cmd.ExecuteReader
DataGrid1.DataBind()
cn.Close()
cn = Nothing
Catch eOle As OleDbException
Response.Write("产生错误：" + eOle.Message)
End Try
End Sub
Private Sub DataGrid1_ItemDataBound(ByVal sender As Object, _
ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles DataGrid1.ItemDataBound
If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then
If e.Item.Cells(0).Text.Length > 26 Then
e.Item.Cells(0).Attributes.Add("Title", e.Item.Cells(0).Text)
e.Item.Cells(0).Text = e.Item.Cells(0).Text.Substring(0, 26) + "…"
End If
e.Item.Cells(1).Text=Format(System.Convert.ToDateTime(e.Item.Cells(1).Text),"yyyy年M月d日 h点m分s秒")
End If
End Sub
End Class
