Web扩充控件（二）-------树型控件使用

现在树型控件使用越来越广泛，这里简要介绍一下Treeview和梅花雪树型控件的使用。不对之处，还请大家不吝指正。

1.梅花雪树型控件
在大数据量上效率比Treeview高不少，像CSDN上都用它。
以下是生成向ACCESS数据库导入数据的文件方法
using System;
using System.Data;
using System.Collections;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Data.SqlClient;
using System.IO;
namespace My.Components
{
/// <summary>
/// XMLControl 的摘要说明。
/// </summary>
public class XMLControl
{
protected Database db;
public XMLControl()
{
//
// TODO: 在此处添加构造函数逻辑
//
db=new Database();//数据库操作类
}
#region 写 TXT 文件的内容
//=======================================================================================================||
//写 TXT 文件的内容显示控制
public string creatTxt()
{
ArrayList StateID = new ArrayList();
ArrayList CountryId= new ArrayList();
ArrayList CountryName=new ArrayList();
ArrayList StateName=new ArrayList();
ArrayList CityID = new ArrayList();
ArrayList AreaName = new ArrayList();
ArrayList AreaID = new ArrayList();
ArrayList CityName = new ArrayList();
ArrayList CityStateId=new ArrayList();
ArrayList StateCountryId=new ArrayList();

string strJs = "ID,parentId,text,hint,icon,data,url,target,method/n";

//加上顶层世界的树型节点的主目录
strJs=strJs+"1,0,all over the world,all over the world,,,http://localhost/test/main.aspx?id=1,main,/n";
//strJs = strJs + "<Troot> /n";

//取得所有国家编号列表，保存到数组CountryId中
SqlDataReader drCountry =db.Reader("select * from country Order By country_Name ASC");
if(drCountry.HasRows)
{
while(drCountry.Read())
{
CountryId.Add((1000-int.Parse(drCountry["country_Id"].ToString())).ToString());
CountryName.Add(drCountry["country_name"].ToString());
}
for(int i=0;i<=CountryId.Count-1;i++)
{
strJs = strJs+CountryId[i]+",1,"+CountryName[i]+","+CountryName[i]+",,,http://localhost/test/main.aspx?id="+CountryId[i]+",main,alert('欢迎网页脚本控件集-MzTreeView10')/n";
}
}

//取得所有州编号列表，保存到数组StateID中
SqlDataReader drState =db.Reader("select * from state left join country on state_countryid=country_id Order By state_Name ASC");
if(drState.HasRows)
{
while(drState.Read())
{
StateID.Add((100000-int.Parse(drState["state_Id"].ToString())).ToString());
StateCountryId.Add((1000-int.Parse(drState["state_countryid"].ToString())).ToString());
StateName.Add(drState["state_name"].ToString());
}
for(int i=0;i<=StateID.Count-1;i++)
{
//strJs = strJs + " <Item id=/""+StateID[i]+"/" pid=/""+StateCountryId[i]+"/">"+StateName[i]+"</Item>/n";
strJs = strJs+StateID[i]+","+StateCountryId[i]+","+StateName[i]+","+StateName[i]+",,,http://localhost/test/main.aspx?id="+StateID[i]+",main,/n";
}
}

//取得所有城市编号列表，保存到数组CityID中
SqlDataReader drCity = db.Reader("SELECT * FROM city left join state on city_statid=state_id Order By city_Name ASC");
CityID.Clear();
if (drCity.HasRows)
{
while (drCity.Read())
{
CityID.Add ((10000000-int.Parse(drCity["city_Id"].ToString())).ToString());
CityName.Add(drCity["city_Name"].ToString());
//StateID.Add((100000-int.Parse(drCity["state_Id"].ToString())).ToString());
StateName.Add(drCity["state_name"].ToString());
CityStateId.Add((100000-int.Parse(drCity["city_statId"].ToString())).ToString());
}

for (int i=0;i<=CityID.Count-1;i++)
{
CityName[i].ToString().Replace("&","/");
//strJs = strJs + " <Item id=/""+CityID[i]+"/" pid=/""+CityStateId[i]+"/">"+CityName[i]+"</Item>/n";
strJs = strJs+CityID[i]+","+CityStateId[i]+","+CityName[i]+","+CityName[i]+",,,http://localhost/test/main.aspx?id="+CityID[i]+",main,/n";
SqlDataReader drArea = db.Reader("SELECT * FROM area left join city on area_cityid=city_id left join state on city_statid=state_id left join country on state_countryid=country_id Where area_cityid='"+(10000000-int.Parse((CityID[i]).ToString()))+"' Order By area_Name ASC");
AreaName.Clear();
AreaID.Clear();

if (drArea.HasRows)
{
while (drArea.Read())
{
AreaName.Add(drArea["area_Name"].ToString());
AreaID.Add((1000000000-int.Parse(drArea["area_Id"].ToString())).ToString());

}
drArea.Close();
for (int j=0;j<=AreaID.Count-1;j++)
{
//strJs = strJs + " <Item id=/""+AreaID[j].ToString()+"/" pid=/""+CityID[i]+"/">"+AreaName[j].ToString()+"</Item> /n";
strJs = strJs+AreaID[j]+","+CityID[i]+","+AreaName[j]+","+AreaName[j]+",,,http://localhost/test/main.aspx?id="+AreaID[j]+",main,/n";
}
}
}
}
strJs = strJs + "/n";
drCountry.Close();
drState.Close();
drCity.Close();

return strJs;
}
#endregion
#region 生成往Access库中到数据的 TXT 文件
public void creTxt(Page objPage)
{
StreamWriter sw = new StreamWriter(objPage.MapPath("../Inc/txtAll.txt"),false,System.Text.Encoding.UTF8);
sw.Write(this.creatTxt());
sw.Flush();
sw.Close();
}
#endregion
}
}

2.微软自带的Treeview控件
特点：感觉可能对浏览器的兼容性可能较好，小数据量速度不错
以下是生成绑定的XML的文件的方法：

using System;
using System.Data;
using System.Collections;
using System.Drawing;
using System.Web;
using System.Web.UI;
using System.Data.SqlClient;
using System.IO;
namespace My.Components
{
/// <summary>
/// XMLControl 的摘要说明。
/// </summary>
public class XMLControl
{
protected Database db;
public XMLControl()
{
//
// TODO: 在此处添加构造函数逻辑
//
db=new Database();//数据库操作类
}
#region 写 TreeView 三级XML的内容
//=======================================================================================================||
//页面城市、地区显示控制
public string TreeView_3()
{
ArrayList StateID = new ArrayList();
ArrayList StateName=new ArrayList();
ArrayList CityID = new ArrayList();
ArrayList AreaName = new ArrayList();
ArrayList AreaID = new ArrayList();
ArrayList CityName = new ArrayList();
ArrayList CityStateId=new ArrayList();

string strJs = "<?xml version=/"1.0/" encoding=/"utf-8/" ?>/n";
strJs = strJs + "<TREENODES> /n";
//取得所有州编号列表，保存到数组StateID中
SqlDataReader drState =db.Reader("select * from state where state_countryid='3' Order By state_Name ASC");
StateID.Clear();
if(drState.HasRows)
{
while(drState.Read())
{
StateID.Add((100000-int.Parse(drState["state_Id"].ToString())).ToString());
StateName.Add(drState["state_name"].ToString());
}
for(int i=0;i<=StateID.Count-1;i++)
{
strJs = strJs + " <treenode Text=/""+StateName[i]+"/" value=/""+StateID[i]+"/">/n";

//取得所有城市编号列表，保存到数组CityID中

SqlDataReader drCity = db.Reader("SELECT * FROM city where city_statid='"+(100000-int.Parse(StateID[i].ToString()))+"' Order By city_Name ASC");
CityID.Clear();
if (drCity.HasRows)
{
while (drCity.Read())
{
CityID.Add ((10000000-int.Parse(drCity["city_Id"].ToString())).ToString());
CityName.Add(drCity["city_Name"].ToString());
}

for (int j=0;j<=CityID.Count-1;j++)
{
strJs = strJs + " <treenode Text=/""+CityName[j]+"/" value=/""+CityID[j]+"/"></treenode> /n";
}
}
//drCity.Close();
strJs =strJs +"</treenode>/n";
}
}

strJs = strJs + "</TREENODES> /n";
//drState.Close();

return strJs;
}
#endregion
#region 生成TreeView XML 文件
public void treeAu3(Page objPage)
{
StreamWriter sw = new StreamWriter(objPage.MapPath("../Inc/treeAU3.xml"),false,System.Text.Encoding.UTF8);
sw.Write(this.TreeView_3());
sw.Flush();
sw.Close();
}
#endregion

}
}