改写文本文件时如何写入汉字？

Question

//注意编码
using System;
using System.IO;
using System.Text;
namespace ConsoleApplication1
{
class Class1
{
static void Main(string[] args)
{
         string s="hello,你好!";
         FileStream fs=new FileStream("hi.txt",FileMode.Create,FileAccess.Write);
         byte[] bArr=Encoding.Default.GetBytes(s);
         fs.Write(bArr,0,bArr.Length);
         fs.Close();         
}
}
}

Answer 1

Unicode uni = Encoding.unicode;
byte[] bytes = uni.GetBytes(str);
fileStream.Write(bytes, 0 , bytes.Length);fileStream.Close();

Answer 2

string str="测试";
filestream fs=new filestream("file.txt",filemode.creat,fileaccess.write);
byte[] by=encoding.default.getbytes(str);
fs.write(by,0,by.length);
fs.close();

Answer 3

StreamWriter sw = New StreamWriter("***.txt" true);
sw.WriteLine(string);
string 可用中文，写文件不分中英文
sw.Close();

Answer 4

StreamWriter sw = New StreamWriter("***.txt" ,true);
sw.WriteLine(string);
string 可用中文，写文件不分中英文
sw.Close();