朋友的 合并txt代码 合并后有乱码.求解

Question

StreamWriter writer = new StreamWriter(@"C:\file.txt"); 
            StreamReader reader; 
            DirectoryInfo dinfo = new DirectoryInfo(@"c:\fileDirectory");             FileInfo[] fileinfos = dinfo.GetFiles("*.txt"); 
            foreach (FileInfo file in fileinfos) 
            { 
                reader = new StreamReader(file.FullName); 
                writer.WriteLine(reader.ReadToEnd()); 
                reader.Close(); 
            } 
            writer.Close();合并txt的代码,经测可以合并.但是有乱码怎么办

Answer 1

        StreamReader reader;
        StreamWriter writer = new StreamWriter(Server.MapPath("js/all.txt"), true, Encoding.UTF8);
        DirectoryInfo dir = new DirectoryInfo(Server.MapPath(""));
        foreach (FileInfo f in dir.GetFiles("*.txt"))
        {
            reader = new StreamReader(f.FullName, Encoding.UTF8);
            writer.WriteLine(reader.ReadToEnd());
            reader.Close();
        }
        writer.Close();
        writer.Dispose();