又学一招——简单的写入文件帮助类

帮助类的内容如下：

  public class FileWrite
    {
        public static void WriteJson(string file, string value)
        {
            var time = "\r\n" + DateTime.Now.ToString(CultureInfo.InvariantCulture) + "\r\n";
            using (var fs = new FileStream(file, FileMode.Append))
            {
                var sw = new StreamWriter(fs);
                sw.Write(time + value);
                sw.Close();
            }
        }
        public static void WriteJson(string file, object value)
        {
            var json = JsonConvert.SerializeObject(value);
            WriteJson(file, json);
        }
    }  public class FileWrite
    {