txtlog.cs

设计模式C#描述之——简单工厂模式、抽象工厂模式、单例与多例模式 设计模式C#描述之——简单工厂模式

using System;
using System.IO;
using System.Text;

namespace LogManage
{
    class TxtLog:Log
    {
        public override void Write(string content, string path)
        {
            //AppendText:如果由 path 指定的文件不存在，则创建该文件。如果该文件存在，则对 StreamWriter 的写入操作将文本追加到该文件。
            StreamWriter sw = File.AppendText(path);
            sw.WriteLine("[" + DateTime.Now.ToString() + "]" + content);
            sw.Close();
        }
        public override string Read(string path)
        {
            StringBuilder bd = new StringBuilder();
            StreamReader sr = File.OpenText(path);
            string content = sr.ReadToEnd();
            sr.Close();
            return content;
        }

        public override string Read(string path, DateTime day)
        {
            StringBuilder bd = new StringBuilder();
            StreamReader sr = File.OpenText(path);
            while (true)
            {
                string line = sr.ReadLine();
                if (line == null)
                    break;
                if (line.StartsWith("[" + day.ToShortDateString()))
                    bd.Append(line + "\r\n");
            }

            string content = bd.ToString();
            sr.Close();
            return content;

        }
    }
}