C# 读写ini文件操作实现_Asp.net

在c#应用程序中，常将ini文件作为配置文件，用于存储应用程序的设置和参数。

一、ini文件结构

ini文件结构简单，由节（sections）和键值对（key-value pairs）组成。每个节由方括号包围，例如[sectionname]，而键值对则是以等号=分隔的字符串，例如key=value。每个节都包含一个或多个键值对，用于存储相关的配置信息。

ini文件示例：

[amplifierform] 
resinitialize=0.5,0.7,0.5,0.6,0.6

[offsignalform] 
resinitialize=0.5,0.7,0.5,0.6,0.6
rescoll=1.3,1.5

该示例中有两个节：amplifierform、offsignalform，每个节下都有一些键值对，用于存储配置信息。

二、读取ini文件中的数据

c#命名空间中没有直接读写ini的类，但在"kernel32.dll"文件中有win32的api函数–writeprivateprofilestring()和getprivateprofilestring()，可操作ini文件。

静态操作使用类

using system;
using system.collections.generic;
using system.io;
using system.linq;
using system.runtime.interopservices;
using system.text;
using system.threading.tasks;

namespace fileoperationsdemo
{
    public class readwriteini
    {
        #region api函数声明

        /// <summary>
        /// 写入ini文件
        /// </summary>
        /// <param name="section">节点名称</param>
        /// <param name="key">键</param>
        /// <param name="val">值</param>
        /// <param name="filepath">ini路径</param>
        /// <returns>0失败/其他成功</returns>
        [dllimport("kernel32")]
        private static extern long writeprivateprofilestring(string section, string key, string val, string filepath);
        /// <summary>
        /// 
        /// </summary>
        /// <param name="section">节点名称，[]内的段落名</param>
        /// <param name="key">键</param>
        /// <param name="def">值(未读取到数据时设置的默认返回值)</param>
        /// 对应api函数的def参数，它的值由用户指定，是当在配置文件中没有找到具体的value时，就用def的值来代替。可以为空
        /// <param name="retval">读取到的结果值</param>
        /// <param name="size">读取缓冲区大小</param>
        /// <param name="filepath">ini配置文件的路径加ini文件名</param>
        /// <returns>读取到的字节数量</returns>
        [dllimport("kernel32")]
        private static extern int getprivateprofilestring(string section, string key, string def, stringbuilder retval, int size, string filepath);
        #endregion

        /// <summary>
        /// 写ini,添加新节点、键值，及编辑修改键对应的值
        /// </summary>
        /// <param name="in_filename">ini配置文件的路径加ini文件名</param>
        /// <param name="section">节点名称，[]内的段落名</param>
        /// <param name="key">键</param>
        /// <param name="value">值</param>
        public static bool inifile_setval(string in_filename, string section, string key, string value)
        {
            if (file.exists(in_filename))
            {
                // 调用winapi函数将key=value写入section节点下
                long len = writeprivateprofilestring(section, key, value, in_filename);
                if (len == 0)
                {
                    return false;
                }
                else
                {
                    return true;
                }
            }
            else
            {
                return true;
            }
        }
        /// <summary>
        /// 读ini
        /// </summary>
        /// <param name="in_filename">ini配置文件的路径加ini文件名</param>
        /// <param name="section">节点名称，[]内的段落名</param>
        /// <param name="key">键</param>
        /// <returns></returns>
        public static string inifile_getval(string in_filename, string section, string key)
        {
            if (file.exists(in_filename))
            {
                // 声明接收的数据
                stringbuilder builder = new stringbuilder(1024);
                // 调用winapi函数读取section节点下key的值
                int len = getprivateprofilestring(section, key, "", builder, 1024, in_filename);
                if (len == 0)
                    return "1";
                else
                    return (builder.tostring());
            }
            else
                return string.empty;
        }
    }
}

操作示例

        /// <summary>
        /// 读取ini文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_click(object sender, eventargs e)
        {
            string pathname = application.startuppath + "\\config\\resoriginal.ini";
            string resstarter = readwriteini.inifile_getval(pathname, "selfcheckface", "resinitialize");
            string[] resinitline = resstarter.split(',');
            for (int ii = 0; ii < resinitline.length; ii++)
            {
                richtextbox2.appendtext(resinitline[ii] + "\n");
            }
        }
        /// <summary>
        /// 写入ini文件，新建或编辑
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button4_click(object sender, eventargs e)
        {
            string pathname = application.startuppath + "\\config\\resoriginal.ini";
            readwriteini.inifile_setval(pathname, "selfcheckface", "resinitialize", "1,2,3,4,5");
            
            string[] resinitline = richtextbox2.lines;
            string tempwrite = string.join(",", resinitline);
            tempwrite=tempwrite.remove(tempwrite.length-1);
            readwriteini.inifile_setval(pathname, "selfcheckf", "resinitialize", tempwrite);
        }

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