C#保存txt为UTF8,去除BOM

  

  Encoding encode = new System.Text.UTF8Encoding(false);
                

                List<Class> cles = ClassService.Instance().FindAll();

                     FileStream stream = new FileStream(TempPath + "\\school_class.txt", FileMode.OpenOrCreate);
                    using (StreamWriter sw = new StreamWriter(stream, encode))
                    {
                        rt.AppendText("写入文件: school_class.txt\r\n");
                        string title = "id\tname";
                        sw.WriteLine(title);
                        rt.AppendText(title + "\r\n");
                        foreach (Class s in cles)
                        {
                            string content = s.Id + "\t" + s.Name;
                            sw.WriteLine(content);
                            rt.AppendText(content + "\r\n");
                        }

                                 
                    }
                    stream.Close();