读写文本

using System;
using System.Collections.Generic;
using System.Configuration;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace MessageText
{
    class FileMessage
    {
        /// <summary>
        /// 将信息写入文本中
        /// </summary>
        /// <param name="AppSettingName"></param>
        /// <param name="title"></param>
        /// <param name="page"></param>
        public static void Write(string path,string title,string text,char i)
        {
            if (path != null && path != "")
            {
                if (!(Directory.Exists(path)))
                {
                    Directory.CreateDirectory(path); //创建日志文件夹
                }
                path += string.Format(@"\{0}.txt", title);

                using (var sw = new StreamWriter(path, true, Encoding.Default))
                {
                    sw.Write(text + i);
                }
            }
        }

        /// <summary>
        /// 读取文本信息，若无此文本则创建并返回null
        /// </summary>
        /// <param name="path"></param>
        /// <param name="title"></param>
        /// <returns></returns>
        public static string Read(string path, string title)
        {
            string text =null;
            if (path != null && path != "")
            {
                if (!Directory.Exists(path)) 
                {
                    Directory.CreateDirectory(path);
                }
                path += string.Format(@"\{0}.txt", title);

                using (var stream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read))
                {
                    var sr = new StreamReader(stream, Encoding.Default);
                    string str = Regex.Replace(sr.ReadToEnd(), @"s+", "");
                    if (str == "") return null;
                    else text = str;
                    sr.Close();
                }
            }
            return text;
        }

        /// <summary>
        /// 读取文本信息并分割为数组，若无此文本则创建并返回null
        /// </summary>
        /// <param name="path"></param>
        /// <param name="title"></param>
        /// <returns></returns>
        public static string[] Read(string path, string title,char i)
        {
            string[] text = null;
            if (path != null && path != "")
            {
                if (!Directory.Exists(path))
                {
                    Directory.CreateDirectory(path);
                }                    
                path += string.Format(@"\{0}.txt", title);

                using (var stream = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read))
                {
                    var sr = new StreamReader(stream, Encoding.Default);
                    string str = Regex.Replace(sr.ReadToEnd(), @"s+", "");
                    if (str != "") text = str.Split(i);
                    sr.Close();
                }
            }
            return text;
        }

        /// <summary>
        /// 读取文本信息并返回，如果没有该文本则返回null，不会创建文本
        /// </summary>
        /// <param name="AppSettingName"></param>
        /// <param name="title"></param>
        /// <returns></returns>
        public static string ReadText(string path,string title)
        {
            string text = null;
            if (path != null && path != "")
            {
                if(!(Directory.Exists(path)))
                {
                    Directory.CreateDirectory(path); //创建日志文件夹
                }
                path += string.Format(@"\{0}.txt", title);

                if (!(File.Exists(path))) return null;

                using (var sr = new StreamReader(path, Encoding.Default))
                {
                    text = Regex.Replace(sr.ReadToEnd(), @"s+", "");
                }
            }
            return text;
        }

        /// <summary>
        /// 读取文本信息分割为字符串数组并返回，如果没有该文本则返回null，不会创建文本
        /// </summary>
        /// <param name="AppSettingName"></param>
        /// <param name="title"></param>
        /// <returns></returns>
        public static string[] ReadText(string path, string title,char i)
        {
            string[] text = null;
            if (path != null && path != "")
            {
                if (!(Directory.Exists(path)))
                {
                    Directory.CreateDirectory(path); //创建日志文件夹
                }
                path += string.Format(@"\{0}.txt", title);

                if (!(File.Exists(path))) return null;

                using (var sr = new StreamReader(path, Encoding.Default))
                {
                    string str = Regex.Replace(sr.ReadToEnd(), @"s+", "");
                    if (str != "") text = str.Split(i);
                }
            }
            return text;
        }

        /// <summary>
        /// 读取末尾页数，若无结果则返回0
        /// </summary>
        /// <param name="AppSettingName"></param>
        /// <param name="title"></param>
        /// <param name="i"></param>
        /// <returns></returns>
        public static int ReadPage(string path, string title, char i)
        {
            int page = 0;
            string[] pageNum = null;
            if (path != null && path != "")
            {
                if (!(Directory.Exists(path))) Directory.CreateDirectory(path); //创建日志文件夹

                path += string.Format(@"\{0}.txt", title);

                using (var fs = new FileStream(path, FileMode.OpenOrCreate, FileAccess.Read))
                {
                    StreamReader sr = new StreamReader(fs, Encoding.Default);
                    string str = Regex.Replace(sr.ReadToEnd(), @"s+", "");
                    if (str != "") pageNum = str.Split(i);

                    if (pageNum != null)
                    {
                        page = Convert.ToInt32(pageNum[pageNum.Length - 2]);
                    }
                    sr.Close();
                }
            }
            return page;
        }

       
    }
}