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   源码介绍

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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace UnityTest
{
    public class InIHelper
    {
         private static string m_FileName = Application.StartupPath "\\AppConfig.ini";
        /// <summary>
        /// 读取配置文件
        /// </summary>
        /// <typeparam name="T"></typeparam>
        /// <param name="section"></param>
        /// <param name="key"></param>
        /// <returns></returns>
        public static T ReadConfig<T>(string section, string key,T fail,string FileName = null)
        {
            if (FileName == null) FileName = m_FileName;
            if (File.Exists(FileName))
            {
                IniFile f = new IniFile(FileName);
                string value = f.ReadContentValue(section, key);

                if (String.IsNullOrWhiteSpace(value))
                    return fail;

                if (typeof(T).IsEnum)
                    return (T)Enum.Parse(typeof(T), value, true);

                return (T)Convert.ChangeType(value, typeof(T));
            }
            else
            {
                return fail;
            }
        }

        /// <summary>
        /// 写配置文件
        /// </summary>
        /// <param name="section"></param>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public static void WriteConfig( string section, string key, string value , string FileName = null)
        {
            if (FileName == null) FileName = m_FileName;
            //如果文件不存在，则创建
            if (!File.Exists(FileName))
            {
                using (FileStream myFs = new FileStream(FileName, FileMode.Create)) { }
            }

            IniFile f = new IniFile(FileName);
            f.WriteContentValue(section, key, value);
        }
    }
    public class IniFile
    {
        public string Path;

        public IniFile(string path)
        {
            this.Path = path;
        }

        /// <summary>
        /// 写入INI文件
        /// </summary>
        /// <param name="section">节点名称[如[TypeName]]</param>
        /// <param name="key">键</param>
        /// <param name="val">值</param>
        /// <param name="filepath">文件路径</param>
        /// <returns></returns>
        [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">节点名称</param>
        /// <param name="key">键</param>
        /// <param name="def">值</param>
        /// <param name="retval">stringbulider对象</param>
        /// <param name="size">字节大小</param>
        /// <param name="filePath">文件路径</param>
        /// <returns></returns>
        [DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string def, StringBuilder retval, int size, string filePath);

        /// <summary>
        /// 写入
        /// </summary>
        /// <param name="section"></param>
        /// <param name="key"></param>
        /// <param name="iValue"></param>
        public void WriteContentValue(string section, string key, string iValue)
        {
            WritePrivateProfileString(section, key, iValue, this.Path);
        }

        /// <summary>
        /// 读取INI文件中的内容方法
        /// </summary>
        /// <param name="Section">键</param>
        /// <param name="key">值</param>
        /// <returns></returns>
        public string ReadContentValue(string Section, string key)
        {
            StringBuilder temp = new StringBuilder(1024);
            GetPrivateProfileString(Section, key, "", temp, 1024, this.Path);
            return temp.ToString();
        }
    }
}