C Implements Summary of Text File Reading and Writing Methods
- 2021-06-29 11:49:19
- OfStack
Method 1:
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 textBox2_TextChanged(object sender, EventArgs e)
{
string path1 = textBox2.Text;
if(!File.Exists(path1))
{
MessageBox.Show(" file does not exist ");
}
}
// Browse button
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)
{
textBox2.Text = ofd.FileName;
}
// Select Folder
/* FolderBrowserDialog fbd = new FolderBrowserDialog();
fbd.ShowDialog();
MessageBox.Show(fbd.SelectedPath);
*/
}
// read file
private void button1_Click(object sender, EventArgs e)
{
if(textBox2.Text!=null)
// Read the contents of the file and display it textbox1 Medium for user modification
{
string path=textBox2.Text;
if (File.Exists(path))
// {
// File.Delete(path);
// }
textBox1.Text = File.ReadAllText(path, Encoding.Default);
}
}
private void button2_Click(object sender, EventArgs e)
{
// string[] appendText=textBox1.Text;
File.WriteAllText(textBox2.Text, textBox1.Text, Encoding.Default);
MessageBox.Show(" Save Successfully ");
}
}
}
Method 2:
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1行,直到文件的最后1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
MessageBox.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=="")
{
MessageBox.Show("想替换的字符都没有就换啊,你太有才了");
}
else
{
if (rTB_Display.Text == "")
{
MessageBox.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1个文件流,用以写入或者创建1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richTextBox1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
MessageBox.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
}
}
}
Method 3:
// Write to Text File
class WriteTextFile
{
static void Main()
{
// If the file does not exist, it is created;Overwrite if present
// This method writes character array wrapping display
string[] lines = { "first line", "second line", "third line"," No. 4 That's ok " };
System.IO.File.WriteAllLines(@"C:\testDir\test.txt", lines, Encoding.UTF8);
// If the file does not exist, it is created;Overwrite if present
string strTest = " This example test 1 Strings written to a text file. ";
System.IO.File.WriteAllText(@"C:\testDir\test1.txt", strTest, Encoding.UTF8);
// Processing lines of text before writing it to a file
//StreamWriter1 Default override of parameters
//StreamWriter No. 2 Parameters are false Overwrite the existing file for true Append text to the end of the file
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);// Append the end of the file directly without breaking lines
file.WriteLine(line);// Append end end end of file directly, wrap
}
}
}
}
}
// Read Text File
class ReadTextFile
{
static void Main()
{
// Read String Directly
string text = System.IO.File.ReadAllText(@"C:\testDir\test1.txt");
Console.WriteLine(text);
// Read as String Array by Line
string[] lines = System.IO.File.ReadAllLines(@"C:\testDir\test.txt");
foreach (string line in lines)
{
Console.WriteLine(line);
}
// Read text files stream from beginning to end
// This method will 1 That's ok 1 Line Read Text
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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