C# · 12月 28, 2021

C#实现文本文件读写方法汇总

方法一:

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;using System.IO; namespace txt{ public partial class Form1 : Form { // string path; public Form1() { InitializeComponent(); button3.Click+=button3_Click; } private void text@R_540_2419@2_TextChanged(object sender,EventArgs e) { string path1 = text@R_540_2419@2.Text; if(!File.Exists(path1)) { Message@R_540_2419@.Show(“文件不存在”); } } //浏览按钮 private void button3_Click(object sender,EventArgs e) { /*if (folderBrowserDialog1.ShowDialog() == DialogResult.OK) { string selUrl = folderBrowserDialog1.SelectedPath; }*/ OpenFileDialog ofd = new OpenFileDialog(); if (ofd.ShowDialog() == DialogResult.OK) { text@R_540_2419@2.Text = ofd.FileName; } //选择文件夹 /* FolderBrowserDialog fbd = new FolderBrowserDialog(); fbd.ShowDialog(); Message@R_540_2419@.Show(fbd.SelectedPath); */ } //读取文件 private void button1_Click(object sender,EventArgs e) { if(text@R_540_2419@2.Text!=null) //读取文件内容并显示在text@R_540_2419@1中让用户修改 { string path=text@R_540_2419@2.Text; if (File.Exists(path)) // { // File.Delete(path); // } text@R_540_2419@1.Text = File.ReadAllText(path,Encoding.Default); } } private void button2_Click(object sender,EventArgs e) { // string[] appendText=text@R_540_2419@1.Text; File.WriteAllText(text@R_540_2419@2.Text,text@R_540_2419@1.Text,Encoding.Default); Message@R_540_2419@.Show(“保存成功”); } }}

方法二:

namespace 文本文件打开测试 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void btn_Read_Click(object sender,EventArgs e) { //异常检测开始 try { FileStream fs = new FileStream(@tB_PachFileName.Text,FileMode.Open,FileAccess.Read);//读取文件设定 StreamReader m_streamReader = new StreamReader(fs,System.Text.Encoding.GetEncoding(“GB2312”));//设定读写的编码 //使用StreamReader类来读取文件 m_streamReader.BaseStream.Seek(0,SeekOrigin.Begin); // 从数据流中读取每一行,直到文件的最后一行,并在rTB_Display.Text中显示出内容 this.rTB_Display.Text = “”; string strLine = m_streamReader.ReadLine(); while (strLine != null) { this.rTB_Display.Text += strLine + “\n”; strLine = m_streamReader.ReadLine(); } //关闭此StreamReader对象 m_streamReader.Close(); } catch { //抛出异常 Message@R_540_2419@.Show(“指定文件不存在”); return; } //异常检测结束 } private void btn_Replace_Click(object sender,EventArgs e) { //判断替换开始 if (tB_Replace.Text == “”&&tB_Replace_2.Text==””) { Message@R_540_2419@.Show(“想替换的字符都没有就换啊,你太有才了”); } else { if (rTB_Display.Text == “”) { Message@R_540_2419@.Show(“文件内容为空无法进行替换,请检查文件”); } else { string str = rTB_Display.Text.ToString(); rTB_Display.Text = str.Replace(@tB_Replace.Text,@tB_Replace_2.Text);//替换 } } //结束 } private void btn_Save_Click(object sender,EventArgs e) { //异常检测开始 try { //创建一个文件流,用以写入或者创建一个StreamWriter FileStream fs = new FileStream(@tB_Save.Text,FileMode.OpenOrCreate,FileAccess.Write); StreamWriter m_streamWriter = new StreamWriter(fs); m_streamWriter.Flush(); // 使用StreamWriter来往文件中写入内容 m_streamWriter.BaseStream.Seek(0,SeekOrigin.Begin); // 把richText@R_540_2419@1中的内容写入文件 m_streamWriter.Write(rTB_Display.Text); //关闭此文件 m_streamWriter.Flush(); m_streamWriter.Close(); } catch { //抛出异常 Message@R_540_2419@.Show(“写入文件失败,请检查路径 文件名与权限是否符合”); } //异常检测结束 } } }

方法三:

//写入文本文件 class WriteTextFile { static void Main() { //如果文件不存在,则创建;存在则覆盖 //该方法写入字符数组换行显示 string[] lines = { “first line”,”second line”,”third line”,”第四行” }; System.IO.File.WriteAllLines(@”C:\testDir\test.txt”,lines,Encoding.UTF8); //如果文件不存在,则创建;存在则覆盖 string strTest = “该例子测试一个字符串写入文本文件。”; System.IO.File.WriteAllText(@”C:\testDir\test1.txt”,strTest,Encoding.UTF8); //在将文本写入文件前,处理文本行 //StreamWriter一个参数默认覆盖 //StreamWriter第二个参数为false覆盖现有文件,为true则把文本追加到文件末尾 using (System.IO.StreamWriter file = new System.IO.StreamWriter(@”C:\testDir\test2.txt”,true)) { foreach (string line in lines) { if (!line.Contains(“second”)) { file.Write(line);//直接追加文件末尾,不换行 file.WriteLine(line);// 直接追加文件末尾,换行 } } } } }//读取文本文件 class ReadTextFile { static void Main() { //直接读取出字符串 string text = System.IO.File.ReadAllText(@”C:\testDir\test1.txt”); Console.WriteLine(text); //按行读取为字符串数组 string[] lines = System.IO.File.ReadAllLines(@”C:\testDir\test.txt”); foreach (string line in lines) { Console.WriteLine(line); } //从头到尾以流的方式读出文本文件 //该方法会一行一行读出文本 using (System.IO.StreamReader sr = new System.IO.StreamReader(@”C:\testDir\test.txt”)) { string str; while ((str = sr.ReadLine()) != null) { Console.WriteLine(str); } } Console.Read(); } }

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