C# 读写Ini文件

  ini文件在Win95以前比较盛行，之后由于出册表等技术的出现，ini技术主键退居二线，不过对于一些小项目，读写ini文件还是很适用的。

       Windows API提供了读写配置文件的操作，在C#程序中只要导入相应的API即可。例如GetPrivateProfileString（）方法，在MSDN查得原型如下：

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DWORD GetPrivateProfileString(  LPCTSTR lpAppName,        // section name  LPCTSTR lpKeyName,        // key name  LPCTSTR lpDefault,        // default string  LPTSTR lpReturnedString,  // destination buffer  DWORD nSize,              // size of destination buffer  LPCTSTR lpFileName        // initialization file name);

 由于C#和C++数据类型不同，在导入win32 API时需要做相应的转换，并且要导入相关的类。如下所示：

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[DllImport("kernel32")]        private static extern int GetPrivateProfileString(string section, string key, string defVal, StringBuilder retVal, int size, string filePath);

 同理导入另一个函数

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[DllImport("kernel32")]        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath)

 在main函数测试如下：

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using System;using System.Collections.Generic;using System.Linq;using System.Runtime.InteropServices;using System.Text;using System.Threading.Tasks; namespace DoingIni{    class Program    {        [DllImport("kernel32")]        private static extern int GetPrivateProfileString(string section, string key, string defVal, StringBuilder retVal, int size, string filePath);         [DllImport("kernel32")]        private static extern long WritePrivateProfileString(string section, string key, string val, string filePath);         /// <summary>            /// 读取INI文件            /// </summary>            /// <param name="section">项目名称(如 [section] )</param>            /// <param name="skey">键</param>           /// <param name="path">路径</param>         static string IniReadValue(string section, string skey, string path)        {            StringBuilder temp = new StringBuilder(500);            int i = GetPrivateProfileString(section, skey, "", temp, 500, path);            return temp.ToString();        }         /// <summary>        /// 写入ini文件        /// </summary>        /// <param name="section">项目名称</param>        /// <param name="key">键</param>        /// <param name="value">值</param>        /// <param name="path">路径</param>        static  void IniWrite(string section, string key, string value, string path)        {            WritePrivateProfileString(section, key, value, path);        }         static void Main(string[] args)        {            IniWrite("上海", "东方明珠", "浦东新区", "f:/test.ini");            IniWrite("上海", "上海中心大厦", "浦东新区", "f:/test.ini");            IniWrite("湖南", "张家界景区", "张家界", "f:/test.ini");            IniWrite("湖南", "凤凰古城", "吉首", "f:/test.ini");            IniWrite("湖北", "武当山", "十堰", "f:/test.ini");            IniWrite("湖北", "黄鹤楼", "武昌", "f:/test.ini");            IniWrite("湖北", "古隆中", "襄阳", "f:/test.ini");            IniWrite("江苏", "瘦西湖", "扬州", "f:/test.ini");            IniWrite("江苏", "中山陵", "南京", "f:/test.ini");            IniWrite("上海", "城隍庙", "浦东新区", "f:/test.ini");             string str = IniReadValue("湖南", "凤凰古城", "f:/test.ini");            Console.WriteLine(str);                        IniReadValue("上海", null, "f:/test.ini");             删除test.ini文件中A 段落中所有键(没有键，也就没有值了)            //IniWrite("A", null, null, "f:/test.ini");             删除test.ini文件中所有段落            //IniWrite(null, null, null, "f:/test.ini");            Console.ReadKey();        }    }}