การตั้งคา config ที่ใช้ในโปรแกรมจาก file

1. สร้าง file สำหรับเก็บ config ต่าง ๆ ของโปรกแกรมก่อน
file name : config.ini
detail:

[DB]
MySQL_LOCAL = "DRIVER=MySQL ODBC 8.0 Unicode Driver;UID=root;PORT=3306;DATABASE=test_db;SERVER=localhost;PASSWORD=root_password"
MySQL_SERVER = "DRIVER=MySQL ODBC 8.0 Unicode Driver;UID=root;PORT=3306;DATABASE=test_db;SERVER=test_mysql.comPASSWORD=root_password"

[COM]
port1 = 1
port2 = 2
port3 = 3
baud = 115200

2. สร้าง function สำหรับค่า config จาก file

using System.Runtime.InteropServices;

/////////////////WINDWOS API//////////////////////////////////////////
        internal static class NativeMethods
        {
            [DllImport("kernel32.dll", EntryPoint = "GetPrivateProfileString", SetLastError = true, ThrowOnUnmappableChar = true, BestFitMapping = false)]
            internal static extern int GetPrivateProfileString(
                    string Section,
                    string Key,
                    string Default,
                    StringBuilder RetVal,
                    int Size,
                    string FilePath
            );
        }

        /////////////////WINDWOS API//////////////////////////////////////////

        /////////////////Function///////////////////////////////////////////////////////
        public string PopValue(string section, string key)
        {
            StringBuilder sb = new StringBuilder(4096);
            string FilePath = AppDomain.CurrentDomain.BaseDirectory + "config.ini";
            int n = GetPrivateProfileString(section, key, "", sb, 4096, FilePath);
            if (n < 1) return string.Empty;
            return sb.ToString();
        }
        /////////////////Function///////////////////////////////////////////////////////

3. เรียกค่า config จาก file
    string connStringLocal = PopValue("DB", "MySQL_LOCAL");
    string connStringServer = PopValue("DB", "MySQL_SERVER");

    int port1 = int.Parse(PopValue("RFID", "port1"));
    int port2 = int.Parse(PopValue("RFID", "port2"));
    int port3 = int.Parse(PopValue("RFID", "port3"));