解决本地文本文件上传到服务器乱码问题（C#），ANSI转UTF8编码

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

namespace testConsoleApplication1
{
    class Class2
    {
        public static void Main()
        {
            FileStream fs = new FileStream(@"D:\name.xml", FileMode.Open, FileAccess.Read);
            //D：\name.xml ANSI编码，含中英文
            StreamReader sr = new StreamReader(fs,Encoding.Default);
            //StreamReader sr = new StreamReader(fs);中文会显示乱码，加上Encoding.Default就没有乱码了
            FileStream fsw = new FileStream(@"D:\renamed.xml", FileMode.Create, FileAccess.Write);
            StreamWriter sw = new StreamWriter(fsw, Encoding.UTF8);
            Char[] charArr = new Char[100];
            int count = sr.Read(charArr, 0, 100);
            while (count != 0)
            {
                sw.Write(charArr, 0, count);
                count = sr.Read(charArr, 0, 100);
            }
            sw.Close();
            sr.Close();
            fsw.Close();
            fs.Close();
            FileStream fstest = new FileStream(@"D:\renamed.xml", FileMode.Open, FileAccess.Read);
            StreamReader srtest = new StreamReader(fstest);
            string rlt = srtest.ReadToEnd();
            Console.WriteLine(rlt);
        }
    }
}