(精华)2020年8月12日 C#基础知识点 文件相关操作

/// 
/// 文件夹  文件管理 
/// 配置文件:AdO.Net 数据库查询;
/// IOC配置文件
/// 
public class MyIO
{
     
    /// 
    /// 配置绝对路径
    /// 
    private static string LogPath = ConfigurationManager.AppSettings["LogPath"];
    private static string LogMovePath = ConfigurationManager.AppSettings["LogMovePath"];

    /// 
    /// 获取当前程序路径
    /// 
    private static string LogPath2 = AppDomain.CurrentDomain.BaseDirectory;

    /// 
    /// 读取文件夹  文件信息
    /// 
    public static void Show()
    {
     
        {
     
            //--------------------------------------核查文件夹操作------------------------------------------
            //检测文件夹是否存在
            if (!Directory.Exists(LogPath))
            {
     

            }
            //获取文件夹信息
            DirectoryInfo directory = new DirectoryInfo(LogPath);
            Console.WriteLine(string.Format("{0} {1} {2}", directory.FullName, directory.CreationTime, directory.LastWriteTime));
            //检测文件是否存在
            if (!File.Exists(Path.Combine(LogPath, "info.txt")))
            {
     
            }
            //获取文件信息
            FileInfo fileInfo = new FileInfo(Path.Combine(LogPath, "info.txt"));
            Console.WriteLine(string.Format("{0} {1} {2}", fileInfo.FullName, fileInfo.CreationTime, fileInfo.LastWriteTime));
        }
        {
     
            //------------------------------------文件夹相关操作-----------------------------------------------
            if (!Directory.Exists(LogPath))
            {
     
                DirectoryInfo directoryInfo = Directory.CreateDirectory(LogPath);//一次性创建全部的子路径
                Directory.Move(LogPath, LogMovePath);//移动原文件夹就不在了
                Directory.Delete(LogMovePath);//删除文件夹
            }
        }
        {
     
            //-----------------------------------文件相关操作--------------------------------------------------
            //合并文件路径
            string fileName = Path.Combine(LogPath, "log.txt");
            string fileNameCopy = Path.Combine(LogPath, "logCopy.txt");
            string fileNameMove = Path.Combine(LogPath, "logMove.txt");
            //判断文件是否存在
            bool isExists = File.Exists(fileName);
            if (!isExists)
            {
     
                //------------------------------------------写入文件和追加内容-------------------------------------
                Directory.CreateDirectory(LogPath);//创建了文件夹之后,才能创建里面的文件
                using (FileStream fileStream = File.Create(fileName))//打开文件流 (创建文件并写入)
                {
     
                    string name = "第一种方式";
                    byte[] bytes = Encoding.Default.GetBytes(name);
                    fileStream.Write(bytes, 0, bytes.Length);
                    fileStream.Flush();
                }

                // 如果文件不存在就创建,如果存在就新建一个覆盖掉
                using (FileStream fileStream = File.Create(fileName))//打开文件流 (创建文件并写入)
                {
     
                    StreamWriter sw = new StreamWriter(fileStream);
                    sw.WriteLine("第二种方式");
                    sw.Flush();
                }

                using (StreamWriter sw = File.AppendText(fileName))//流写入器(创建/打开文件并写入)
                {
     
                    string msg = "第三种方式";
                    sw.WriteLine(msg);
                    sw.Flush();
                }
                using (StreamWriter sw = File.AppendText(fileName))//流写入器(创建/打开文件并写入)
                {
     
                    string name = "第四种方式";
                    byte[] bytes = Encoding.Default.GetBytes(name);
                    sw.BaseStream.Write(bytes, 0, bytes.Length);
                    sw.Flush();
                }


                //------------------------------------------读取文件-------------------------------------
                //=======1==========
                foreach (string result in File.ReadAllLines(fileName))
                {
     
                    Console.WriteLine(result);
                }
                //=======2==========
                string sResult = File.ReadAllText(fileName);
                //=======3==========
                Byte[] byteContent = File.ReadAllBytes(fileName);
                string sResultByte = System.Text.Encoding.UTF8.GetString(byteContent);
                //=======4==========
                //文件太大,用工具去打开的时候,计算机直接卡死了
                using (FileStream stream = File.OpenRead(fileName))//分批读取
                {
     
                    int length = 5;
                    int result = 0;

                    do
                    {
     
                        byte[] bytes = new byte[length];
                        result = stream.Read(bytes, 0, 5);
                        for (int i = 0; i < result; i++)
                        {
     
                            Console.WriteLine(bytes[i].ToString());
                        }
                    }
                    while (length == result);
                }
                //------------------------------------------复制和删除文件-------------------------------------
                File.Copy(fileName, fileNameCopy);
                File.Move(fileName, fileNameMove);
                File.Delete(fileNameCopy);
                File.Delete(fileNameMove);//尽量不要delete
            }
        }
        {
     
            //--------------------获取所有驱动器信息---------------
            DriveInfo[] drives = DriveInfo.GetDrives();

            foreach (DriveInfo drive in drives)
            {
     
                if (drive.IsReady)
                    Console.WriteLine("类型:{0} 卷标:{1} 名称:{2} 总空间:{3} 剩余空间:{4}", drive.DriveType, drive.VolumeLabel, drive.Name, drive.TotalSize, drive.TotalFreeSpace);
                else
                    Console.WriteLine("类型:{0}  is not ready", drive.DriveType);
            }

        }
        {
     
            //--------------------其他操作---------------
            Console.WriteLine(Path.GetDirectoryName(LogPath));  //返回目录名,需要注意路径末尾是否有反斜杠对结果是有影响的
            Console.WriteLine(Path.GetDirectoryName(@"d:\\abc")); //将返回 d:\
            Console.WriteLine(Path.GetDirectoryName(@"d:\\abc\"));// 将返回 d:\abc
            Console.WriteLine(Path.GetRandomFileName());//将返回随机的文件名
            Console.WriteLine(Path.GetFileNameWithoutExtension("d:\\abc.txt"));// 将返回abc
            Console.WriteLine(Path.GetInvalidPathChars());// 将返回禁止在路径中使用的字符
            Console.WriteLine(Path.GetInvalidFileNameChars());//将返回禁止在文件名中使用的字符
            Console.WriteLine(Path.Combine(LogPath, "log.txt"));//合并两个路径
        }
    }

    /// 
    /// 关于文件异常处理
    /// 1  try catch旨在上端使用,保证对用户的展示
    /// 2  下端不要吞掉异常,隐藏错误是没有意义的,抓住再throw也没意义
    /// 3  除非这个异常对流程没有影响或者你要单独处理这个异常
    /// 
    /// 
    public static void Log(string msg)
    {
     
        StreamWriter sw = null;
        try
        {
     
            string fileName = "log.txt";
            string totalPath = Path.Combine(LogPath, fileName);

            if (!Directory.Exists(LogPath))
            {
     
                Directory.CreateDirectory(LogPath);
            }
            sw = File.AppendText(totalPath); // 如果文件不存在,就新建一个文件,然后写入内容
            sw.WriteLine(string.Format("{0}:{1}", DateTime.Now, msg));
            sw.WriteLine("***************************************************");
        }
        catch (Exception ex)
        {
     
            Console.WriteLine(ex.Message);//log //建议大家在写日志的时候,把异常吞掉;
            //throw ex;
            //throw new exception("这里异常");
        }
        finally//无论是否发生异常  全都都会执行
        {
     
            if (sw != null)
            {
     
                sw.Flush();
                sw.Close();
                sw.Dispose();
            }
        }
    }

}

你可能感兴趣的:(C#,c#)