datalist页眉和页脚的问题（在线等待）
我在web项目里用到了datalist控件，我怎样通过单击button按钮改变datalist页眉控件中的label控件的text内容。具体如下：1、我在web项目中加入一个datalist控件
2、我编辑datalist控件的模板，加入一个页眉。
3、我在datalist控件的页眉中加入一个table
4、我托拽一个label控件到datalist控件页眉的table中
5、我添加一个button按钮
6、当我单击这个button按钮时，怎样修改datalist控件页眉中的label.text值.
谢谢。 --------------------编程问答-------------------- ((Label)this.dl.FindControl("Label1")).Text = "...."; --------------------编程问答-------------------- 我是这么写的，但是当我运行的时候，他出错，要求使用new创建对象实例，调用方法前检查对象是否为空，获取异常帮助
((Label)this.DataList1.FindControl("Label35")).Text = "abcdefg";
请问我该怎么处理，谢谢 --------------------编程问答-------------------- 能把你的页面代码发上来么 --------------------编程问答-------------------- 你的datalist中绑定数据了么？先帮定数据再看看~ --------------------编程问答-------------------- 代码如下：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class Admin_sel_jjz_jjfw : System.Web.UI.Page
{
public SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["SQLCONNECTIONSTRING"].ConnectionString);
public string zmlm = null;
protected void Page_Load(object sender, EventArgs e)
{
string info = "";
info += "function getData()";
info += "{";
info += "var province=document.getElementById('rq');";
info += "var pindex = province.selectedIndex;";
info += "var pValue = province.options[pindex].value;";
info += "var pText = province.options[pindex].text;";
info += "document.getElementById('rq').innerText=pText;";
info += "}";
this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "LinkageDDList", info, true);
if (!this.Page.ClientScript.IsClientScriptIncludeRegistered(this.GetType(), "Date"))
{
//动态注册 js
this.Page.ClientScript.RegisterClientScriptInclude(this.GetType(), "Date", "scripts/Date.js");
}
this.TextBox5.Attributes.Add("onclick", "setday(this,document.getElementById('" + this.TextBox5.ClientID + "'))");
this.TextBox6.Attributes.Add("onclick", "setday(this,document.getElementById('" + this.TextBox6.ClientID + "'))");
if (!IsPostBack)
{
DropDownList2.Items.Clear();
//SqlConnection con = new SqlConnection("server=192.168.0.4;uid=jdc;pwd=jdc;database=jdc");
con.Open();
/*
SqlDataAdapter da = new SqlDataAdapter("select * from kcjjzjjsjb", con);
DataSet ds = new DataSet();
da.Fill(ds, "kcjjzjjsjb");
DataList1.DataSource = ds.Tables[0].DefaultView;
DataList1.DataBind();
*/
//绑定集结站
DataSet ds_jjz = new DataSet();
SqlDataAdapter da_jjz = new SqlDataAdapter("select * from zmzd where czxz='编组站' or czxz='区段站' order by czxz", con);
da_jjz.Fill(ds_jjz, "zmzd");
DropDownList1.DataSource = ds_jjz.Tables["zmzd"].DefaultView;
DropDownList1.DataTextField = "hzzm";
DropDownList1.DataBind();
//选择集结范围
string sql_jjfw = "select * from zmzd order by czxz";
SqlCommand mycmd = new SqlCommand(sql_jjfw, con);
SqlDataReader myreader = mycmd.ExecuteReader();
while (myreader.Read())
{
DropDownList2.Items.Add(myreader["hzzm"].ToString().Trim() + myreader["czxz"].ToString().Trim());
}
con.Close();
}
}
protected void Button1_Click(object sender, EventArgs e)
{
//ListBox1.Items.Remove(ListBox1.SelectedIndex);
if (ListBox1.SelectedIndex > -1)
{
ListBox1.Items.RemoveAt(ListBox1.SelectedIndex);
}
}
protected void Button3_Click(object sender, EventArgs e)
{
Label229.Text="";
if ((Equals(TextBox3.Text.Trim(),string.Empty))||(Equals(TextBox4.Text.Trim(),string.Empty)))
{
Label229.Text="运行时间和挂运次数不能为空!!!";
}
else
{
ListBox1.Items.Add(DropDownList2.Text.Trim() + " " + TextBox3.Text.Trim() + " " + TextBox4.Text.Trim());
TextBox3.Text = "";
TextBox4.Text = "";
}
}
protected void Button4_Click(object sender, EventArgs e)
{
ListBox1.Items.Clear();
}
protected void Button2_Click(object sender, EventArgs e)
{
Label229.Text = "";
if (Equals(TextBox5.Text.Trim(), string.Empty))
{
Label229.Text = "起始日期不能为空!!!";
}
else if (Equals(TextBox6.Text.Trim(), string.Empty))
{
Label229.Text = "结束日期不能为空!!!";
}
else if (Equals(TextBox1.Text.Trim(), string.Empty))
{
Label229.Text = "棚车百分比不能为空!!!";
}
else if (Equals(TextBox2.Text.Trim(), string.Empty))
{
Label229.Text = "平车百分比不能为空!!!";
}
else if (ListBox1.Items.Count<=0)
{
Label229.Text = "请选择集结范围!!!";
}
else
{
Label229.Text = "正在生成集结时间表，请稍候...";
//this.csh_jjzjjfw();
//this.get_zmlm();
//this.ins_jjz();
this.datalist_db();
//((Label)this.dl.FindControl("Label1")).Text = "....";
((Label)this.DataList1.FindControl("Label35")).Text = "abcdefg";
}
}
//获取站名略码
public void get_zmlm()
{
con.Open();
string sql = "select zmlm from zmzd where hzzm='" + DropDownList1.Text.Trim() + "'";
SqlCommand mycmd = new SqlCommand(sql, con);
SqlDataReader myreader = mycmd.ExecuteReader();
while (myreader.Read())
{
zmlm = myreader["zmlm"].ToString().Trim();
}
con.Close();
}
//集结站入库
public void ins_jjz()
{
con.Open();
string sql = "insert into jjz (zmhz,zmlm) values ('" + DropDownList1.Text.Trim() + "','" + zmlm.Trim() + "')";
SqlCommand mycom = new SqlCommand(sql, con);
int i = mycom.ExecuteNonQuery();
con.Close();
Label229.Text = Convert.ToString(i) + "条集结站记录插入成功!!!";
}
//生成集结站集结时间表初始化
public void csh_jjzjjfw()
{
string sql_jjz = "delete from jjz";
con.Open();
SqlCommand jjz_com = new SqlCommand(sql_jjz, con);
int i = jjz_com.ExecuteNonQuery();
//con.Close();
string sql_jjfw = "delete from jjfw";
//con.Open();
SqlCommand jjfw_com = new SqlCommand(sql_jjfw, con);
int ii=jjfw_com.ExecuteNonQuery();
string sql_kcjjzjjsjb = "delete from kcjjzjjsjb";
SqlCommand kcjjzjjsjb_com = new SqlCommand(sql_kcjjzjjsjb, con);
int iii = kcjjzjjsjb_com.ExecuteNonQuery();
con.Close();
Label229.Text="集结范围时间表初始化成功!!!";
}
//datalist数据绑定
public void datalist_db()
{
con.Open();
SqlDataAdapter da = new SqlDataAdapter("select * from kcjjzjjsjb", con);
DataSet ds = new DataSet();
da.Fill(ds, "kcjjzjjsjb");
DataList1.DataSource = ds.Tables[0].DefaultView;
DataList1.DataBind();
con.Close();
}
protected void DataList1_ItemCommand(object source, DataListCommandEventArgs e)
{
Label la35 = (Label)this.DataList1.Items[e.Item.ItemIndex].FindControl("label35");
la35.Text = "abcdefg";
}
}
--------------------编程问答-------------------- 怎么没人回答呢，帮帮忙吧！！！
补充：.NET技术 , C#
