使用RenderMethod 委托实现DataGrid表头合并
今天看到一篇文章,提出使用RenderMethod委托可以实现DataGrid表头的合并。自己测试了一下,效果不错,把DataGrid的表头转化为用Table来控制,就可以随心所欲了。可能前面有人用这种方法是实现过,但是我还是把代码贴上来,大家分享一下
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using System;
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using System.Collections;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Web;
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using System.Web.SessionState;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.HtmlControls;
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using System.Data.SqlClient;
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namespace WebDataGridHeader
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{
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/// <summary>
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///DataGrid表头合并问题
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/// </summary>
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public class WebForm1 : System.Web.UI.Page
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{
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protected System.Web.UI.WebControls.DataGrid DataGrid1;
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protected System.Web.UI.WebControls.Label Label1;
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private void Page_Load(object sender, System.EventArgs e)
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{
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// 在此处放置用户代码以初始化页面
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string m_strConn = "server=.;uid=sa;pwd=sa;database=Northwind";
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SqlConnection conn = new SqlConnection(m_strConn);
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try
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{
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conn.Open();
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SqlCommand cmd = new SqlCommand("SELECT * FROM Employees",conn);
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SqlDataAdapter adp = new SqlDataAdapter(cmd);
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DataTable dt = new DataTable();
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adp.Fill(dt);
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this.DataGrid1.DataSource = dt;
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this.DataGrid1.DataBind();
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}
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catch(Exception ex)
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{
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throw ex;
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}
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finally
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{
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conn.Close();
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}
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}
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Web 窗体设计器生成的代码
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/// <summary>
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/// 创建Item
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/// </summary>
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/// <param name="sender"></param>
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/// <param name="e"></param>
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private void DataGrid1_ItemCreated(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
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{
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//将Item的呈现方法定向到自定义的呈现方法上
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ListItemType lit = e.Item.ItemType;
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if(ListItemType.Header == lit)
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{
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e.Item.SetRenderMethodDelegate(new RenderMethod(NewRenderMethod));
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}
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}
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/// <summary>
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/// 自定义的Item呈现方法
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/// </summary>
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/// <param name="writer"></param>
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/// <param name="ctl"></param>
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private void NewRenderMethod(HtmlTextWriter writer,Control ctl)
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{
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//不需要从<TR>标签开始
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//输出“联系电话”列
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writer.Write("<TD colspan=\"3\" align=\"center\">联系电话</TD>\n");
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//“地址”列必须有rowspan属性且必须在第一列呈现
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TableCell cell = (TableCell)ctl.Controls[ctl.Controls.Count - 1];
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cell.Attributes.Add("rowspan","2");
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cell.RenderControl(writer);
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//现在关闭第一行
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writer.Write("</TR>\n");
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//将设计时的样式属性添加到第二行使得两行的外观相似
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this.DataGrid1.HeaderStyle.AddAttributesToRender(writer);
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//插入第二行
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writer.RenderBeginTag("TR");
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//呈现除了最后一列(刚才已经呈现过了)外的所有在设计时定义的cells
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for(int i=0;i<=ctl.Controls.Count-2;i++)
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{
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ctl.Controls[i].RenderControl(writer);
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}
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//不需要以</TR>结束
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}
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}
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}
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