c#写出文本保存到文件稳定代码

/// <summary>
        /// 写出文本
        /// </summary>
        /// <param name="str">写出文本</param>
        /// <param name="file">文件名</param>
        public void write(string str, string file)
        {
            FileStream fs = new FileStream(System.AppDomain.CurrentDomain.BaseDirectory + file, FileMode.Create);
            StreamWriter sw = new StreamWriter(fs);
            //开始写入
            sw.Write(str);
            //清空缓冲区
            sw.Flush();
            //关闭流
            sw.Close();
            fs.Close();
        }