c#读取与修改utf-8格式的txt文件

没有用。net直接写代码在控制台显示

using System;
using System.Text;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            // 写入内容，然后用utf8编码保存
            string text = 
                 "文件文件的内容，包含中文和英文，Hello world!世界你好！";
            File.WriteAllText(@"d:\a.txt", text, Encoding.UTF8);

            // 从文件中读入内容并显示
            string s = File.ReadAllText(@"d:\a.txt", Encoding.UTF8);
            Console.WriteLine(s);
        }
    }
}

public static void writehtmlfile(string shtml, string htmlpath) { streamwriter sw = null; try { utf8encoding utf8 = new utf8encoding(false); using (sw = new streamwriter(htmlpath, false, utf8)) { sw.write(shtml); } } catch { throw new exception("存储路径错误,请检查路径" + htmlpath + "是否存在!"); } finally { sw.close(); } }