asp.net怎么解决文本中文乱码的问题

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 /// 
        /// 解决文本中文乱码   各类文本编码转UTF-8 文本        /// 
        /// 原路径        /// 临时保存路径        /// 新的文件路径        /// 新文件路径        public static string  GetUtf8(string fullPath,string savePath,string strnew)        {                             Encoding e =GetFileEncodeType(fullPath);                                System.IO.File.Create(savePath).Close();                     using (StreamReader sr = new StreamReader(fullPath, e, false))                                {                              string utf8info = string.Empty;                            Encoding utf8 = Encoding.UTF8;                             // Convert the string into a byte[].                            byte[] unicodeBytes = e.GetBytes(sr.ReadToEnd());                           // Perform. the conversion from one encoding to the other.                            byte[] asciiBytes = Encoding.Convert(e, utf8, unicodeBytes);                         // Convert the new byte[] into a char[] and then into a string.                         // This is a slightly different approach to converting tillustrate                       // the use of GetCharCount/GetChars.         char[] asciiChars = new char[utf8.GetCharCount(asciiBytes, 0, asciiBytes.Length)];         utf8.GetChars(asciiBytes, 0, asciiBytes.Length, asciiChars, 0);         utf8info = new string(asciiChars);         using (StreamWriter sw = new StreamWriter(savePath, false, Encoding.UTF8))                                    {                                        sw.Write(utf8info);                                    }                                }                                System.IO.File.Delete(fullPath);                                System.IO.File.Copy(savePath,strnew,true);                                System.IO.File.Delete(savePath);                                return strnew;        }方法2                    using (FileStream fs = new FileStream(fullPath, FileMode.Open))                                {                           using (StreamReader sr = new StreamReader(fs,Encoding.Default))                                    {                                        while (!sr.EndOfStream)                                        {                                            string sLine = sr.ReadLine();                                            //StringBuilder b = new StringBuilder();                                            //b.AppendLine(sLine);                                            //另存到其他txt文件中                   using (StreamWritersw=System.IO.File.AppendText(savepath))                                            {                                                //string n = b.ToString();                                                sw.WriteLine(sLine.ToString());                                            }                                        }                                    }                                }                                System.IO.File.Delete(fullPath);                                string strNewFile = fullPath;                                System.IO.File.Copy(savepath, strNewFile, true);                                System.IO.File.Delete(savepath);           //using (StreamReader sr = new StreamReader(strNewFile,Encoding.Default, false))                                //{              //    using (StreamWriter sw = new StreamWriter(fullPath, falsEncoding.UTF8))                                //    {                                //        sw.Write(Server.HtmlEncode(sr.ReadToEnd()));                                //    }                                //}                                //System.IO.File.Delete(strNewFile);                                FileInfo fileNew = new FileInfo(strNewFile);                                sourcesFile.File_Size = fileNew.Length;                                this.sourcesFileService.Save(sourcesFile);                            }

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