C#读写文本和连接数据库

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Data;
using System.Data.SqlClient;
using System.IO;

namespace WindowsFormsApplication3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string conn = "Data Source=(local); Database=modelsearch3;Integrated Security=SSPI;";
            SqlConnection objcon = new SqlConnection(conn);
            SqlDataAdapter adapter;
            adapter = new SqlDataAdapter("select * from model", objcon);
            SqlCommandBuilder sqlBuilder = new SqlCommandBuilder(adapter);
            objcon.Open(); 
            DataTable dt = new DataTable("model");
            adapter.Fill(dt);
            for (int i = 0; i < 631; i++)
            {
                DataRow row = dt.Rows[i];
                string f = row.ItemArray[4].ToString();
                string s = row.ItemArray[7].ToString();
                string t = row.ItemArray[8].ToString();
                //StreamWriter fw = File.AppendText("C:\frontString.txt");
                //fw.Write(f + "
");
                //StreamWriter sw = File.AppendText("C:\sideString.txt");
                //sw.Write(s + "
");
                //StreamWriter tw = File.AppendText("C:\topString.txt");
                //tw.Write(t + "
");
                StreamWriter zw = File.AppendText("C:\modelString.txt");
                zw.Write(f + s + t + "
");
                //fw.Close();
                //sw.Close();
                //tw.Close();
                zw.Close();
            }
        }
    }
}

 参考：

http://zhidao.baidu.com/question/318486288.html

http://www.cnblogs.com/aidd2008/archive/2008/12/05/1348695.html

C#读取文本

            int file_count = 0;
            StreamReader front_file_reader = new StreamReader("C:\front_coordinate_add.txt");
            StreamReader side_file_reader = new StreamReader("C:\side_coordinate_add.txt");
            StreamReader top_file_reader = new StreamReader("C:\top_coordinate_add.txt");

            ArrayList frontFeature = new ArrayList();   //前台sketch的特征符 (front)
            ArrayList sideFeature = new ArrayList();    //前台sketch的特征符 (side)
            ArrayList topFeature = new ArrayList();     //前台sketch的特征符 (top)

            while (file_count < 5)
            {
                string front_file_route = "";
                front_file_route = front_file_reader.ReadLine();

                string side_file_route = "";
                side_file_route = side_file_reader.ReadLine();

                string top_file_route = "";
                top_file_route = top_file_reader.ReadLine();

                string front_coordinate_str = "";
                //char[] front_buffer = new char[30000];
                StreamReader front_reader = new StreamReader(front_file_route);
                //front_reader.Read(front_buffer,0,29999);
                front_coordinate_str = front_reader.ReadLine();
                //string front_coordinate_str = new string(front_buffer);
                front_reader.Close();

                string side_coordinate_str = "";
                StreamReader side_reader = new StreamReader(side_file_route);
                side_coordinate_str = side_reader.ReadLine();
                side_reader.Close();

                string top_coordinate_str = "";
                StreamReader top_reader = new StreamReader(top_file_route);
                top_coordinate_str = top_reader.ReadLine();
                top_reader.Close();

                bool result = WordStreamMatching.getInstance().matching(front_coordinate_str, side_coordinate_str, top_coordinate_str, ref frontFeature, ref sideFeature, ref topFeature);

                if (!result)
                    MessageBox.Show("123");

                file_count++;
            }