C# IO 文件读写操作

StreamReader sr = new StreamReader(Directory.GetCurrentDirectory() + "\\test.txt")
string line;
while ((line = sr.ReadLine()) != null)
{
              Console.WriteLine(line);
}

 写操作

 string ss = "one , two , three " + "\n" + "four , fire ,sex \n seven ,eight , nine , ten";
 string path = Directory.GetCurrentDirectory() + "//test.txt";
 FileStream fs = new FileStream(path,FileMode.Create);
 StreamWriter sw = new StreamWriter(fs);
 sw.WriteLine(ss);
 sw.Flush();

 2.InI文件读写操作

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Runtime.InteropServices;

namespace AppTest.config
{
   public class InitConfigure
    {
        private static string _filePath = string.Empty;//文件路径

        public static string FilePath
        {
            get { return _filePath; }
            set { _filePath = value; }
        }

       [System.Runtime.InteropServices.DllImport("kernel32")]
        private static extern int GetPrivateProfileString(string section, string key, string defVal, StringBuilder retVal, int size, string _filePath);

       [System.Runtime.InteropServices.DllImport("kernel32")]
       private static extern long WritePrivateProfileString(string section, string key, string val, string _filePath);
       

      public static string ReadVal(string section,string key)
      {
          string defVal ="";
          StringBuilder retVal = new StringBuilder(10000); //if the == right side have many tytes, need init the (10000),thus below have error.
          int size = 10240;
          string rt = "";
          try
          {
              GetPrivateProfileString(section, key, defVal, retVal, size, _filePath);
              rt = retVal.ToString();
          }
          catch
          {
              rt ="";
          }
          return rt;
      }

      public static bool WriteVal(string section,string key,string val)
      {
          try
          {
              if (WritePrivateProfileString(section, key, val, _filePath) == 0)
                  return false;
              else
                  return true;
          }
          catch
          {
              return false;
          }
      } 
    }
}