C#查询数据库把结果输出到XML的例子
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Data.SqlClient;
using System.Data;
namespace ConsoleApplication4
{
class Program
{
static void Main(string[] args)
{
//sqlserver身份验证
//string sqlconn = "server=(local);database=keede1228;user id=sa;password=123;";
//windows身份验证
string sqlconn = "server=(local);database=keede1228;integrated security=SSPI;";
string select = "dirr4";
SqlConnection conn = new SqlConnection(sqlconn);
Console.WriteLine("33");
conn.Open();
Console.WriteLine("11");
//SqlCommand cmd = new SqlCommand(select, conn);
//SqlDataReader reader = cmd.ExecuteReader();
//while (reader.Read())
//{
// Console.WriteLine("cityid:{0} city:{1} area:{2}", reader[0], reader[1], reader[2]);
//}
SqlDataAdapter da = new SqlDataAdapter(select, conn);
DataSet ds = new DataSet();
da.Fill(ds, "custo");
foreach (DataRow row in ds.Tables["custo"].Rows)
Console.WriteLine("'{0}'from {1}", row[0], row[1]);
ds.WriteXml("write.xml", XmlWriteMode.WriteSchema);
conn.Close();
Console.WriteLine("22");
Console.ReadKey();
}
}
}
DataSet类太强大了！
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<?xml version="1.0" encoding="utf-8"?>
<LinkLibrary xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<Link Cat="aa" Url="aa" Desc="aa" />
<Link Cat="bb" Url="aa" Desc="aa" />
<Link Cat="cc" Url="aa" Desc="aa" />
&l ......
水仙花数：一个三位整数各位数字的立方和等于该数本身就称该数为水仙花数，水仙花数共有4个，分别为：153、370、371、407( 例如：1^3 + 5^3 + 3^3 = 153 )。我写的代码如下，你有其他的实现代码也可以发表评论。
int i, m,n,k;
for (i = 100; i < 1000; i++)
{
//取得百位数
m = i / 100;
//取� ......
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 i_salesDAL;
using i_s ......
此XML实例以服务器端部门管理为例：（其界面如下）
private void btn_UpdateGroup_Click(object sender, EventArgs e)
{
XmlDocument xmlDoc = new XmlDocument();
& ......
//打开某文件(假设web.config在根目录中)
string filename=Server.MapPath("/") + @"WebApplication1\web.config";
XmlDocument xmldoc= new XmlDocument();
xmldoc.Load(filename);
//得到顶层节点列表
......
