C# 文件的写入与读取

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Newtonsoft.Json;
using System.Text;

    //写入文件
    public void CreateFile()
    {
        string Path = System.Web.HttpContext.Current.Server.MapPath("~/") + "EmpowerText/";
        if (!Directory.Exists(Path))    //判断路径是否存在。存在返回true,不存在返回false
        {
            Directory.CreateDirectory(Path);
        }
        datacontent aa = new datacontent();
        aa.name = "这是测试内容1111";
        List<datacontent> list = new List<datacontent>();
        list.Add(aa);
        System.Web.Script.Serialization.JavaScriptSerializer jsonTask = new System.Web.Script.Serialization.JavaScriptSerializer();
        //string str = jsonTask.Serialize(list); 
        //list = jsonTask.Deserialize<List<datacontent>>(str);

        //获得字节数组
        byte[] data = Encoding.UTF8.GetBytes(jsonTask.Serialize(list));//使用UTF-8编码进行写入，并进行序列化

        //在路径下创建文件
        FileStream fs = new FileStream(Path + "test.txt", FileMode.Create);
        //开始写入
        fs.Write(data, 0, data.Length);
        //清空缓冲区、关闭流
        fs.Flush();
        fs.Close();
    }

    /// <summary>
    /// 读取文件
    /// </summary>
    /// <returns></returns>
    public  void ReadFile()         
    {
        ///获取根目录信息下，指定目录信息。
        string Path = System.Web.HttpContext.Current.Server.MapPath("~/") + "EmpowerText/test.txt";
        if (File.Exists(Path)) //判断路径是否存在
        {
            FileStream fs = new FileStream(@"" + Path + "", FileMode.Open, FileAccess.Read, FileShare.None); //初始化FileStream
            StreamReader sr = new StreamReader(fs, Encoding.UTF8);//使用UTF-8编码进行读取
            // 全部读完
            string restOfStream = sr.ReadToEnd();
            sr.Close();
            System.Web.Script.Serialization.JavaScriptSerializer jsonTask = new System.Web.Script.Serialization.JavaScriptSerializer();
            List<datacontent> list = jsonTask.Deserialize<List<datacontent>>(restOfStream);//反序列化
            Console.WriteLine(list);
        }
        else
        {
            throw new ArgumentException("文件不存在。");
        }        

    }
    public class datacontent
    {
        public string name { set; get; }
    }