App_win_V1.0.0_xintang_V1.0.0/ConUpdate/LogHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

namespace ConUpdate
{
    class LogHelper
    {
        /**/
        /// <summary>
        /// 写入日志文件
        /// </summary>
        /// <param name="input"></param>
        public string WriteInfoFile(string input)
        {
            try
            {
                if (!Directory.Exists(Directory.GetCurrentDirectory() + "\\UpdateLogs"))
                    Directory.CreateDirectory(Directory.GetCurrentDirectory() + "\\UpdateLogs");
                /**/
                ///指定日志文件的目录
                string fname = Directory.GetCurrentDirectory() + "\\UpdateLogs\\LogFile(" + DateTime.Today.Date.ToString("yyyy-MM-dd") + ").txt";
                /**/
                ///定义文件信息对象

                FileInfo finfo = new FileInfo(fname);

                if (!finfo.Exists)
                {
                    FileStream fs;
                    fs = File.Create(fname);
                    fs.Close();
                    finfo = new FileInfo(fname);
                }

                /**/
                ///判断文件是否存在以及是否大于2K
                if (finfo.Length > 1024 * 1024 * 10)
                {
                    /**/
                    ///文件超过10MB则重命名
                    File.Move(Directory.GetCurrentDirectory() + "\\UpdateLogs\\LogFile.txt", Directory.GetCurrentDirectory() + "\\UpdateLogs\\" + "LogFile{" + Guid.NewGuid() + "}.txt");
                    /**/
                    ///删除该文件
                    //finfo.Delete();
                }
                //finfo.AppendText();
                /**/
                ///创建只写文件流

                using (FileStream fs = finfo.OpenWrite())
                {
                    /**/
                    ///根据上面创建的文件流创建写数据流
                    StreamWriter w = new StreamWriter(fs);

                    /**/
                    ///设置写数据流的起始位置为文件流的末尾
                    w.BaseStream.Seek(0, SeekOrigin.End);

                    /**/
                    ///写入“Log Entry : ”
                    w.Write("\n\rLog Entry : ");

                    /**/
                    ///写入当前系统时间并换行
                    w.Write("{0} {1} \n\r", DateTime.Now.ToLongTimeString(),
                        DateTime.Now.ToLongDateString());

                    /**/
                    ///写入日志内容并换行
                    w.Write(input + "\n\r");

                    /**/
                    ///写入------------------------------------“并换行
                    //w.Write("------------------------------------\n\r");

                    /**/
                    ///清空缓冲区内容，并把缓冲区内容写入基础流
                    w.Flush();

                    /**/
                    ///关闭写数据流
                    w.Close();

                    return "0";
                }
            }
            catch (Exception ex)
            {
                return ex.Message + ex.StackTrace;
            }
        }

        /// <summary>
        /// 删除 fileName 文件夹里一个月之前的日志
        /// </summary>
        /// <param name="fileName"></param>
        /// <param name="month"></param>
        public void DeleteFiles(string fileName = "")
        {
            try
            {
                if (string.IsNullOrEmpty(fileName))
                    fileName = Directory.GetCurrentDirectory() + "\\UpdateLogs";
                if (!Directory.Exists(fileName))//若文件夹不存在则返回
                    return;
                DirectoryInfo dir = new DirectoryInfo(fileName);
                //不是目录

                if (dir == null)
                    return;
                //DateTime DT = dir.CreationTime;

                FileSystemInfo[] files = dir.GetFileSystemInfos();
                for (int i = 0; i < files.Length; i++)
                {
                    FileInfo file = files[i] as FileInfo;
                    //是文件
                    if (file != null)
                    {
                        DateTime DT = file.CreationTime;
                        if (DateTime.Now.Month - DT.Month >= 1)
                        {
                            file.Delete();
                        }
                    }
                    else
                    {
                        DirectoryInfo dir1 = files[i] as DirectoryInfo;
                        if (dir1 != null)
                        {
                            DateTime DT = dir1.CreationTime;
                            if (DateTime.Now.Month - DT.Month >= 1)
                            {
                                //dir1.Delete();
                                System.IO.Directory.Delete(fileName + "\\" + dir1.Name, true);
                            }
                        }
                    }
                }
            }
            catch
            {
            }

        }
    }
}