使用StreamReader和StreamWriter读取和写入文本文件

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1.读取文本文件

using System;using System.Collections.Generic;using System.Text;using System.Linq;using System.Collections;using System.Diagnostics;using System.IO;namespace 练习专用{    class Program    {        static void Main(string[] args)        {            using (FileStream fs = new FileStream(@"E:\清理系统盘.txt", FileMode.Open))            {                using (StreamReader sr = new StreamReader(fs))                {                    //一行一行读取                    StringBuilder sb = new StringBuilder();                    while (!sr.EndOfStream)                    {                        sb.AppendLine(sr.ReadLine());                    }                    Console.WriteLine(sb.ToString());                    //直接读到末尾                    //string str = sr.ReadToEnd();                    //Console.WriteLine(str);                }            }        }    }}

2.写入文本文件

using System;using System.Collections.Generic;using System.Text;using System.Linq;using System.Collections;using System.Diagnostics;using System.IO;namespace 练习专用{    class Program    {        static void Main(string[] args)        {            using (FileStream fs = new FileStream(@"E:\test.txt", FileMode.OpenOrCreate))            {                using (StreamWriter sw=new StreamWriter(fs))                {                    string str = "不积跬步，无以至千里；不积小流，无以成江海。";                    sw.Write(str);                }            }        }    }}

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