App_win_iot_tmp/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 void WriteInfoFile(string input)
        {
            try
            {
                var strfileName = "upgradeLog";
                /**/
                ///指定日志文件的目录
                strfileName = strfileName + DateTime.Now.ToString("yyyy-MM-dd");
                string fpath = System.AppDomain.CurrentDomain.BaseDirectory + "\\log\\" + DateTime.Now.ToString("yyyy-MM-dd") + "\\";
                if (!Directory.Exists(fpath))
                {
                    DirectoryInfo directoryInfo = new DirectoryInfo(fpath);
                    directoryInfo.Create();
                }

                string fname = System.AppDomain.CurrentDomain.BaseDirectory + "\\log\\" + DateTime.Now.ToString("yyyy-MM-dd") + "\\" + strfileName + ".txt";

                /**/
                ///定义文件信息对象
                ///
                FileInfo finfo = new FileInfo(fname);
                if (!finfo.Exists)
                {
                    FileStream fs = new FileStream(fname, FileMode.Create, FileAccess.Write);
                    //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(System.AppDomain.CurrentDomain.BaseDirectory + "\\LogFile.txt", System.AppDomain.CurrentDomain.BaseDirectory + DateTime.Now.TimeOfDay + "\\LogFile.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();
                }
            }
            catch { }
        }
        public void DeleteFiles(string fileName = "")
        {
            try
            {
                if (string.IsNullOrEmpty(fileName))
                    fileName = System.AppDomain.CurrentDomain.BaseDirectory + "\\log";
                if (!Directory.Exists(fileName))//若文件夹不存在则返回
                    return;
                DirectoryInfo dir = new DirectoryInfo(fileName);//new DirectoryInfo(System.AppDomain.CurrentDomain.BaseDirectory + "\\log");
                //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
            {
            }
        }
    }
}