使用StreamReader和StreamWriter读取和写入文本文件

1.读取文本

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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

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);  
                }  
            }  
        }  
    }  
} 

原文:https://blog.csdn.net/sinat_32832727/article/details/53768116