C#后台保存操作日志

using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Web;

namespace test.Models
{
    public class SaveLog
    {
        public static void SaveL(string id, string type,string json)
        {
            string path = AppDomain.CurrentDomain.BaseDirectory;
            if (!string.IsNullOrEmpty(path))
            {
                path = AppDomain.CurrentDomain.BaseDirectory + "log";
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }
                path = path + "\\" + DateTime.Now.ToString("yyyyMMdd");
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }
                path = path + "\\" + DateTime.Now.ToString("yyyyMMdd") + ".txt";
                if (!File.Exists(path))
                {
                    FileStream fs = File.Create(path);
                    fs.Close();
                }
                if (File.Exists(path))
                {
                    StreamWriter sw = new StreamWriter(path, true, System.Text.Encoding.Default);
                    sw.WriteLine(DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss.fff") + "-->" + id + "-->" +type+ "-->" + json);
                    //  sw.WriteLine("----------------------------------------");
                    sw.Close();
                }
            }
        }
    }
}