带图片的，多列的DropDownList的实现

下面是模仿的DropDownList的效果，支持图片，多列，换行等。查看例子

WebDropDownList.aspx

<%@ Page language="c#" Codebehind="WebDropDownList.aspx.cs"validateRequest="false"
 AutoEventWireup="false" Inherits="eMeng.WebDropDownList" %>


模拟下拉列表框

模拟下拉框

请选择？        onmousedown="this.className='link_arrow1'" onmouseout="this.className='link_arrow0'">6   ShowHeader="False">  DataFormatString=" {0}">    HeaderText="" DataFormatString="{0:yyyy年MM月dd日}">  onclick="CheckMe(this);document.all.form1.city.value=this.innerText"> 北京市  onclick="CheckMe(this);document.all.form1.city.value=this.innerText"> 上海市  onclick="CheckMe(this);document.all.form1.city.value=this.innerText"> 河南省  onclick="CheckMe(this);document.all.form1.city.value=this.innerText">深圳市  onclick="CheckMe(this);document.all.form1.city.value=this.innerText">大连市  onclick="CheckMe(this);document.all.form1.city.value=this.innerText">云南省

WebDropDownList.aspx.cs

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.OleDb;

namespace eMeng
{
///

/// ShowList 的摘要说明。
///
public class WebDropDownList : System.Web.UI.Page
{
protected System.Web.UI.WebControls.DataGrid DataGrid1;

private void Page_Load(object sender, System.EventArgs e)
{   
DataGrid1.Columns[0].ItemStyle.Width = Unit.Pixel(400);
DataGrid1.Columns[1].ItemStyle.Width = Unit.Pixel(100);
Data_Bind();
}

public void Data_Bind()
{
Response.CacheControl = "no-cache";
Response.Expires = -1;
try
{
string strSQL = "SELECT id,objectGuid,Title,CreateDate,HitCount FROM Document ORDER BY id DESC";
string cnString = (new Connection()).ConnectionString;
OleDbConnection cn = new OleDbConnection(cnString);
cn.Open();
OleDbCommand cmd = new OleDbCommand(strSQL, cn);
DataGrid1.DataSource = cmd.ExecuteReader(CommandBehavior.CloseConnection);
DataGrid1.DataBind();
cn.Close();
cn.Dispose();
cn = null;
cmd.Dispose();
cmd = null;
}
catch(OleDbException myOleDbException)
{
Response.Write("错误：" + myOleDbException.Message + ":" + myOleDbException.HelpLink);
Response.End();
}
}
private void DataGrid1_ItemDataBound(object sender,System.Web.UI.WebControls.DataGridItemEventArgs e)
{

if( e.Item.ItemIndex != -1 )
{
e.Item.Attributes.Add("onmouseover", "this.bgColor='#C1D2EE'");
e.Item.Attributes.Add("onclick",
"document.all.text1.innerText=this.cells[0].innerText;document.all.form1.city.value=this.cells[0].innerText;");
if (e.Item.ItemIndex % 2 == 0 )
{
 e.Item.Attributes.Add("bgcolor", "#FFFFFF");
 e.Item.Attributes.Add("onmouseout", "this.bgColor=document.getElementById('DataGrid1').getAttribute('singleValue')");
}
else
{
 e.Item.Attributes.Add("bgcolor", "oldlace");
 e.Item.Attributes.Add("onmouseout", "this.bgColor=document.getElementById('DataGrid1').getAttribute('oldValue')");
}
}
else
{
DataGrid1.Attributes.Add("oldValue", "oldlace");
DataGrid1.Attributes.Add("singleValue", "#FFFFFF");
}
}
#region Web Form Designer generated code
override protected void OnInit(EventArgs e)
{
//
// CODEGEN：该调用是 ASP.NET Web 窗体设计器所必需的。
//
InitializeComponent();
base.OnInit(e);
}

///

/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
///
private void InitializeComponent()
{   
this.DataGrid1.ItemDataBound += new System.Web.UI.WebControls.DataGridItemEventHandler(this.DataGrid1_ItemDataBound);
this.Load += new System.EventHandler(this.Page_Load);
}
#endregion
}
}