C# 读写INI配置文件

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

 

namespace WindowsApplication16
{
    public partial class Form1 : Form
    {
        string path = GetAppPath() + "PrintSet.ini";

        public static string GetAppPath()
        {
            string startupPath = Application.StartupPath;
            if (!startupPath.EndsWith(@"\"))
            {
                startupPath = startupPath + @"\";
            }
            return startupPath;
        }

        public Form1()
        {
            InitializeComponent();
        }

        [DllImport("Kernel32")]
        public static extern bool WritePrivateProfileString
        (
        string section,
        string key,
        string val,
        string filePath
        );

        [DllImport("kernel32")]
        public static extern int GetPrivateProfileString
        (
        string section,
        string key,
        string def,
        byte[] retVal,
        int size,
        string filePath
        );

        public static string ReadString(string Section, string Ident, string Default, string FileName)
        {
            Byte[] Buffer = new Byte[65535];
            int bufLen = GetPrivateProfileString(Section, Ident, Default, Buffer, Buffer.GetUpperBound(0), FileName);
            
            string s = Encoding.GetEncoding(0).GetString(Buffer);
            s = s.Substring(0, bufLen);
            return s.Trim();
        }

        private void button2_Click(object sender, EventArgs e)
        {
        
            WritePrivateProfileString("test","test","500",path);
            WritePrivateProfileString("test1", "test", "700", path);

        }

        private void button1_Click(object sender, EventArgs e)
        {
           MessageBox.Show(Convert.ToString(ReadString("test", "test", "200", path)));
        }

    }
}