『C#基础』C#读写TXT文档

主要内容：

1. TXT文件读取、写入
2. 文件夹/目录创建、删除、移动、计算文件夹大小

基本代码：

using System;
using System.IO;
using csdemo.basic.StreamDemo;

namespace csdemo.basic
{
    class Program
    {
        static void Main(string[] args)
        {
            Test test = new Test();
            test.txtManage();
        }
    }
    class Test
    {
        public void txtManage()
        {
            Random r = new Random();
            
            // 文件夹操作
            if (!Directory.Exists(@"log\"))
            {
                // 创建文件夹
                Directory.CreateDirectory(@"log\");
            }
            else if (r.Next() % 3 == 0)
            {
                // 移动文件夹
                Directory.Move(Directory.GetCurrentDirectory(), Directory.GetCurrentDirectory()+@"\old\");
                // 创建文件夹
                Directory.CreateDirectory(@"log\");
            }
            else if (r.Next() % 3 == 1)
            {
                // 删除文件夹,且删除所有子目录
                Directory.Delete(@"log\",true);
                // 创建文件夹
                Directory.CreateDirectory(@"log\");
            }
            else
            {
                // 计算文件夹大小
                long size = 0;
                DirectoryInfo d = new DirectoryInfo(@"log\");

                FileInfo[] fi = d.GetFiles();

                foreach (FileInfo fin in fi)
                {
                    size += fin.Length;
                }

                Console.WriteLine("文件夹大小：" + size);
            }

            string txtName; // 欲操作的文件名
            txtName = DateTime.Now.ToString("yyyyMMdd");
            TextManager tm = new TextManager(@"log\" + txtName + ".txt");

            for(int i=0;i<10;i++)
            {
                if (!tm.write(@"log\" + txtName + ".txt", i.ToString()))
                {
                    Console.WriteLine("File write ERROR!");
                }
            }

            Console.Write(tm.read(@"log\" + txtName + ".txt"));

            Console.ReadLine();
        }
    }
}

using System.IO;

namespace csdemo.basic.StreamDemo
{
    class TextManager
    {
        FileStream fs;
        public TextManager(string txtName)
        {
            fs = new FileStream(txtName, FileMode.OpenOrCreate,FileAccess.ReadWrite);
            fs.Close();
        }
        public bool write(string txtName,string content)
        {
            fs = new FileStream(txtName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            StreamWriter sw = new StreamWriter(fs);

            sw.Flush();

            sw.BaseStream.Seek(0, SeekOrigin.End);
            sw.WriteLine(content);
            sw.WriteLine();

            sw.Flush();
            sw.Close();
            fs.Close();

            return true;
        }
        public string read(string txtName)
        {
            fs = new FileStream(txtName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            StreamReader sr = new StreamReader(fs);

            sr.BaseStream.Seek(0, SeekOrigin.Begin);

            string result = sr.ReadToEnd();

            sr.Close();
            fs.Close();

            return result;            
        }
    }
}

参考网摘：

1. http://www.cnblogs.com/pegasus923/archive/2011/01/26/1944838.html
2. http://www.cnblogs.com/anytao/archive/2006/04/28/387637.html