StreamReader和StreamWriter用法

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace StreamReader和StreamWriter
{
    class Program
    {
        static void Main(string[] args)
        {
            //StreamReader和StreamWriter只能操作字符，不能操作字节
            using (StreamReader sr = new StreamReader(@"1.txt", Encoding.Default))
            {
                while (!sr.EndOfStream)
                {
                    Console.WriteLine(sr.ReadLine());
                }
            }

            using (StreamWriter sw = new StreamWriter(@"1.txt", true, Encoding.Default))
            {
                sw.WriteLine("今天天气真好！" + DateTime.Today);
            }
        }
    }
}