ASP.NET 2.0中合并 GridView 的表头单元格

在实际工作中，往往需要合并表格头部的单元格，下面就是一个实现的例子。运行结果如图：

C#

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<% ... @ Page Language="C#" AutoEventWireup="true"  %>

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

< script  runat ="server" > ...
  ICollection CreateDataSource()
  ...{
    System.Data.DataTable dt = new System.Data.DataTable();
    System.Data.DataRow dr;
    dt.Columns.Add(new System.Data.DataColumn("学生姓名", typeof(System.String)));
    dt.Columns.Add(new System.Data.DataColumn("语文", typeof(System.Decimal)));
    dt.Columns.Add(new System.Data.DataColumn("数学", typeof(System.Decimal)));
    dt.Columns.Add(new System.Data.DataColumn("英语", typeof(System.Decimal)));
    for (int i = 0; i < 8; i++)
    ...{
      System.Random rd = new System.Random(Environment.TickCount * i); ;
      dr = dt.NewRow();
      dr[0] = "学生" + i.ToString();
      dr[1] = System.Math.Round(rd.NextDouble() * 100, 2);
      dr[2] = System.Math.Round(rd.NextDouble() * 100, 2);
      dr[3] = System.Math.Round(rd.NextDouble() * 100, 2);
      dt.Rows.Add(dr);
    }
    System.Data.DataView dv = new System.Data.DataView(dt);
    return dv;
  }

  protected void Page_Load(object sender, EventArgs e)
  ...{
    if (!IsPostBack)
    ...{

      GridView1.BorderColor = System.Drawing.Color.DarkOrange;
      GridView1.DataSource = CreateDataSource();
      GridView1.DataBind();
    }
  }

  protected void GridView1_RowCreated(object sender, GridViewRowEventArgs e)
  ...{
    if (e.Row.RowType == DataControlRowType.Header)
    ...{
      GridViewRow rowHeader = new GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Normal);
      rowHeader.BackColor = System.Drawing.Color.White;
      rowHeader.Font.Bold = true;

      TableCellCollection cells = e.Row.Cells;
      TableCell headerCell = new TableCell();
      headerCell.Text = "";
      rowHeader.Cells.Add(headerCell);

      headerCell = new TableCell();
      headerCell.Text = "学生成绩";
      headerCell.ColumnSpan = cells.Count - 1;
      headerCell.HorizontalAlign = HorizontalAlign.Center;

      rowHeader.Cells.Add(headerCell);
      rowHeader.Visible = true;
      GridView1.Controls[0].Controls.AddAt(0, rowHeader);
    }
  }

  protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
  ...{
    e.Row.Attributes.Add("style", "background:#FFF");
  }
</ script >

< html  xmlns ="http://www.w3.org/1999/xhtml" >
< head >
   < title > 合并 GridView 的表头单元格 </ title >
</ head >
< body >
   < form  id ="Form1"  runat ="server" >
     < asp:GridView  ID ="GridView1"  runat ="server"  CellSpacing ="1"  CellPadding ="3"
      Font-Size ="12px"  Width ="300px"  BackColor ="orange"  BorderWidth ="0"
      OnRowDataBound ="GridView1_RowDataBound"  OnRowCreated ="GridView1_RowCreated" >
     </ asp:GridView >
   </ form >
</ body >
</ html >

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VB.NET

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<% ... @ Page Language="VB"  %>

<! DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd" >

< script  runat ="server" > ...
  Function CreateDataSource() As ICollection
    Dim dt As System.Data.DataTable = New System.Data.DataTable
    Dim dr As System.Data.DataRow
    dt.Columns.Add(New System.Data.DataColumn("学生姓名", GetType(System.String)))
    dt.Columns.Add(New System.Data.DataColumn("语文", GetType(System.Decimal)))
    dt.Columns.Add(New System.Data.DataColumn("数学", GetType(System.Decimal)))
    dt.Columns.Add(New System.Data.DataColumn("英语", GetType(System.Decimal)))
    Dim i As Integer = 0
    For i = 0 To 7
      Dim rd As System.Random = New System.Random(Environment.TickCount * i)

      dr = dt.NewRow
      dr(0) = "学生" + i.ToString
      dr(1) = System.Math.Round(rd.NextDouble * 100, 2)
      dr(2) = System.Math.Round(rd.NextDouble * 100, 2)
      dr(3) = System.Math.Round(rd.NextDouble * 100, 2)
      dt.Rows.Add(dr)
    Next
    Dim dv As System.Data.DataView = New System.Data.DataView(dt)
    Return dv
  End Function

  Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    If Not IsPostBack Then
      GridView1.BorderColor = System.Drawing.Color.DarkOrange
      GridView1.DataSource = CreateDataSource()
      GridView1.DataBind()
    End If
  End Sub

  Protected Sub GridView1_RowCreated(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    If e.Row.RowType = DataControlRowType.Header Then
      Dim rowHeader As GridViewRow = New GridViewRow(0, 0, DataControlRowType.Header, DataControlRowState.Normal)
      rowHeader.BackColor = System.Drawing.Color.White
      rowHeader.Font.Bold = True
      Dim cells As TableCellCollection = e.Row.Cells
      Dim headerCell As TableCell = New TableCell
      headerCell.Text = ""
      rowHeader.Cells.Add(headerCell)
      headerCell = New TableCell
      headerCell.Text = "学生成绩"
      headerCell.ColumnSpan = cells.Count - 1
      headerCell.HorizontalAlign = HorizontalAlign.Center
      rowHeader.Cells.Add(headerCell)
      rowHeader.Visible = True
      GridView1.Controls(0).Controls.AddAt(0, rowHeader)
    End If
  End Sub

  Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As GridViewRowEventArgs)
    e.Row.Attributes.Add("style", "background:#FFF")
  End Sub

</ script >

< html  xmlns ="http://www.w3.org/1999/xhtml" >
< head >
   < title > 合并 GridView 的表头单元格 </ title >
</ head >
< body >
   < form  id ="Form1"  runat ="server" >
     < asp:GridView  ID ="GridView1"  runat ="server"  CellSpacing ="1"  CellPadding ="3"
 &