C# 读写ini文件

using System;
using System.Text;
using System.IO;
using System.Runtime.InteropServices;

public class IniFile{
    public string path;

    [DllImport("kernel32")]//返回0表示失败，非0为成功
    private static extern long WritePrivateProfileString(string section, string key, 
            string val, string filePath);

    [DllImport("kernel32")]//返回取得字符串缓冲区的长度
    private static extern long GetPrivateProfileString(string section, string key,
            string defVal, StringBuilder retVal, int size, string filePath);

    public IniFile(string fullPath){
        if (!File.Exists(fullPath)){
            //文件不存在，建立文件
            System.IO.StreamWriter sw = new System.IO.StreamWriter(fullPath, false, System.Text.Encoding.Default);
            try{
                sw.Write("#配置文件");
                sw.Close();
            }
            catch{
                throw (new ApplicationException("Ini文件不存在"));
            }
        }
        path = fullPath;
    }

    //ini 文件读取值 注意要是没有值返回的是个空串而不是null
    public string Get(string section, string key){   
        if (File.Exists(this.path)){
            int readLength = 256;
            StringBuilder data = new StringBuilder(readLength);
            GetPrivateProfileString(section, key, "", data, readLength, this.path);
            return data.ToString();
        }
        else {
            return string.Empty;
        }
    }

    //ini 文件写值 value 为 string类型时
    public bool Set(string section, string key, string value){
        if (File.Exists(this.path))        {
            long opState = WritePrivateProfileString(section, key, value, this.path);
            if (opState != 0){
                return true;
            }
        }
        return false;
    }

    //ini 文件写值 value 为 int类型时
    public bool Set(string section, string key, int value){
        if (File.Exists(this.path)){
            string strValue = string.Format("%d", value);
            long opState = WritePrivateProfileString(section, key, strValue, this.path);
            if (opState != 0){
                return true;
            }
        }
        return false;
    }
}