log.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
{
    public class Log
    {
        /// <summary>
        /// 写入日志
        /// </summary>
        /// <param name="content">日志内容</param>
        /// <param name="path">日志地址</param>
        public 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();
        }
        /// <summary>
        /// 读取日志
        /// </summary>
        /// <param name="path">日志地址</param>
        /// <returns>日志内容</returns>
        public string Read(string path)
        {
            StringBuilder bd = new StringBuilder();
            StreamReader sr = File.OpenText(path);
            string content = sr.ReadToEnd();
            sr.Close();
            return content;
        }

        /// <summary>
        /// 读取日志
        /// </summary>
        /// <param name="path">日志地址</param>
        /// <param name="path">日志日期</param>
        /// <returns>日志内容</returns>
        public 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;
 
        }
    }
}