xiaomiMes/MainForm/ClassFile/FALibraryClass/FileFunction.cs

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

namespace BZFAStandardLib
{
    /// <summary>
    /// txt文件操作专用类
    /// </summary>
    public static class FileOperate
    {
        private static Mutex mutexNew = new Mutex();
        private static Mutex mutexWrite = new Mutex();
        /// <summary>
        /// 新建文件,
        /// </summary>
        /// <param name="txtFile">文件路径+文件名(包含扩展名)</param>
        public static void NewTxtFile(string txtFile)
        {
            string path = txtFile.Substring(0, txtFile.LastIndexOf("\\"));
            if (!Directory.Exists(path)) Directory.CreateDirectory(path); //判断路径是否存在,不存在则创建
            if (!File.Exists(txtFile))  //判断文件是否存在,不存在则创建
            {
                using (FileStream fileStream = new FileStream(txtFile, FileMode.Create, FileAccess.Write))
                {
                    fileStream.Close();
                }
            }

        }

        /// <summary>
        /// 新建并写入txt文件;
        /// </summary>
        /// <param name="txtFile">文件路径+文件名(包含扩展名)</param>
        /// <param name="txt">写入内容</param>
        public static void NewTxtFile(string txtFile, string txt)
        {
            string str1 = "\r\n====================================================================\r\n";
            string str2 = "\r\n====================================================================";
            string path = txtFile.Substring(0, txtFile.LastIndexOf("\\"));
            bool fileExists = File.Exists(txtFile);

            // 如果文件不存在，则创建文件并写入内容
            if (!fileExists)
            {
                using (FileStream fileStream = new FileStream(txtFile, FileMode.Create, FileAccess.Write))
                using (StreamWriter streamWriter = new StreamWriter(fileStream))
                {
                    streamWriter.Write(str1 + txt + str2);  // 直接写入内容
                }
            }
            else
            {
                // 如果文件存在，则打开文件并在末尾追加内容
                using (FileStream fileStream = new FileStream(txtFile, FileMode.Append, FileAccess.Write))
                using (StreamWriter streamWriter = new StreamWriter(fileStream))
                {
                    streamWriter.WriteLine(str1 + txt + str2);  // 使用 WriteLine 确保有换行符
                }
            }
        }

        /// <summary>
        /// 带锁
        /// </summary>
        /// <param name="txtFile"></param>
        public static void NewFile(string file)
        {
            try
            {
                mutexNew.WaitOne();
                string path = file.Substring(0, file.LastIndexOf("\\"));
                if (!Directory.Exists(path)) Directory.CreateDirectory(path); //判断路径是否存在,不存在则创建
                if (!File.Exists(file))  //判断文件是否存在,不存在则创建
                {
                    using (FileStream fileStream = new FileStream(file, FileMode.Create, FileAccess.Write))
                    {
                        fileStream.Close();
                    }
                }
                mutexNew.ReleaseMutex();
            }
            catch (Exception ex)
            {
                mutexNew.ReleaseMutex();
            }
        }
        /// <summary>
        /// 写入txt文件;
        /// </summary>
        /// <param name="txtFile">文件路径+文件名(包含扩展名)</param>
        /// <param name="txt">写入内容</param>
        public static bool WriteTxtFile(string txtFile, string txt)
        {
            if (!File.Exists(txtFile)) NewTxtFile(txtFile); //判断文件是否存在，不存在则新建;
            try
            {
                using (FileStream fileStream = new FileStream(txtFile, FileMode.Open, FileAccess.Write))    //写入文件
                {
                    StreamWriter streamWriter = new StreamWriter(fileStream);
                    //sw.BaseStream的Position或Seek()可移动文件流指针到的任意位置;
                    streamWriter.BaseStream.Seek(0, SeekOrigin.End);  //在txt末尾写入;
                    streamWriter.Write(txt);      //写入txt文件内容;
                    streamWriter.Flush();
                    streamWriter.Close();
                    fileStream.Close();
                }
                return true;
            }
            catch { return false; }
        }
        /// <summary>
        /// 带锁
        /// </summary>
        /// <param name="txtFile"></param>
        /// <param name="txt"></param>
        public static void WriteFile(string file, string txt)
        {
            try
            {
                mutexWrite.WaitOne();
                if (!File.Exists(file)) NewFile(file); //判断文件是否存在，不存在则新建;
                using (FileStream fileStream = new FileStream(file, FileMode.Open, FileAccess.Write))    //写入文件
                {
                    StreamWriter streamWriter = new StreamWriter(fileStream);
                    //sw.BaseStream的Position或Seek()可移动文件流指针到的任意位置;
                    streamWriter.BaseStream.Seek(0, SeekOrigin.End);  //在txt末尾写入;
                    streamWriter.Write(txt);      //写入txt文件内容;
                    streamWriter.Flush();
                    streamWriter.Close();
                    fileStream.Close();
                }
                mutexWrite.ReleaseMutex();
            }
            catch
            {
                mutexWrite.ReleaseMutex();
            }
        }

        /// <summary>
        /// 读取txt文件内容;
        /// </summary>
        /// <param name="txtFile">文件路径+文件名(包含扩展名)</param>
        /// <returns>返回txt文件内容</returns>
        public static string ReadTxtFile(string txtFile)
        {
            if (!File.Exists(txtFile)) return ""; //判断文件是否存在;
            string Return = "";
            using (FileStream fileStream = new FileStream(txtFile, FileMode.Open, FileAccess.Read))
            {
                StreamReader streamReader = new StreamReader(fileStream, Encoding.UTF8);
                Return = streamReader.ReadToEnd().ToString();
                streamReader.Close();
                fileStream.Close();
            }
            return Return;
        }

        /// <summary>
        /// 读取最后一行内容;
        /// </summary>
        /// <param name="txtFile">文件路径+文件名(包含扩展名)</param>
        /// <returns></returns>
        public static string ReadLastLine(string txtFile)
        {
            if (!File.Exists(txtFile)) return ""; //判断文件是否存在;
            string[] allLines = File.ReadAllLines(txtFile);
            if (allLines.Length > 0)
                return allLines[allLines.Length - 1];
            else return "";
        }

        /// <summary>
        /// 覆盖最后一行内容;
        /// </summary>
        /// <param name="txtFile">文件路径+文件名(包含扩展名)</param>
        /// <param name="txt"></param>
        public static void CoverLastLine(string txtFile, string txt)
        {
            if (File.Exists(txtFile))  //判断文件是否存在;
            {
                string[] allLines = File.ReadAllLines(txtFile);
                if (allLines.Length > 0)
                {
                    allLines[allLines.Length - 1] = txt;
                    File.WriteAllLines(txtFile, allLines);
                }
            }
        }

        /// <summary>
        /// 移除最后一行内容;
        /// </summary>
        /// <param name="txtFile">文件路径+文件名(包含扩展名)</param>
        public static void RemoveLastLine(string txtFile)
        {
            if (File.Exists(txtFile))  //判断文件是否存在
            {
                string[] allLines = File.ReadAllLines(txtFile);
                if (allLines.Length > 0)
                {
                    Array.Resize(ref allLines, allLines.Length - 1);
                    File.WriteAllLines(txtFile, allLines);
                }
            }
        }
    }
}