C#—文件读写

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/* * 启动窗体后，单击“保存文件”，打开“保存”对话框，将richTextBox里保存的文件保存到指定位置。 * 单击“打开文件”菜单，将指定的文件内容读取到rithTextBox里。 */using System;using System.Collections.Generic;using System.ComponentModel;using System.Text;using System.IO;using System.Windows.Forms;namespace WindowsFormsApplication2{        public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {        }        private void 打开文件ToolStripMenuItem_Click(object sender, EventArgs e)        {            if (openFileDialog1.ShowDialog() == DialogResult.OK)            {                string filename = openFileDialog1.FileName;                this.richTextBox1.Text=RWFFilebyFileStream.Read(filename);                MessageBox.Show("打开成功");            }        }        private void 保存文件ToolStripMenuItem_Click(object sender, EventArgs e)        {            if (saveFileDialog1.ShowDialog() == DialogResult.OK)            {                string filename = saveFileDialog1.FileName;                RWFFilebyFileStream.Write(filename, this.richTextBox1.Text.Trim());                MessageBox.Show("保存成功");            }        }        private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)        {            Application.Exit();        }    }    public class RWFFilebyFileStream    {        public static void Write(string strFile, string strText)        {    //利用FileStream写文件            FileStream fs = new FileStream(strFile, FileMode.Append, FileAccess.Write);            UTF8Encoding tmp = new UTF8Encoding();            byte[] b = tmp.GetBytes(strText);            fs.Write(b, 0, b.Length);       //将内容写入文件中            fs.Dispose();        }        public static string Read(string strFile)        {            FileStream fs = new FileStream(strFile, FileMode.Open, FileAccess.Read);            long i = fs.Length;            byte[] b = new byte[fs.Length];            fs.Read(b, 0, b.Length);        //将文件内容读取到字节数组b中            fs.Dispose();            UTF8Encoding tmp = new UTF8Encoding();     //UTF8是一种编码模式，能将字节流转换为字符串            return tmp.GetString(b);        }    }}

运行结果：

/* * 利用StreamReader类，读取文件内容并显示在ritchTextBox控件中。 * 利用StreamWriter类，将ritchTextBox控件中内容写入文件。 */using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.IO;using System.Linq;using System.Text;using System.Windows.Forms;namespace WindowsFormsApplication3{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private void Form1_Load(object sender, EventArgs e)        {        }        private void button1_Click(object sender, EventArgs e)        {            if (openFileDialog1.ShowDialog()==DialogResult.OK)            {                string fileName = openFileDialog1.FileName;                textBox1.Text = fileName;                StreamReader sr=new StreamReader(fileName,Encoding.GetEncoding("gb2312"));                string line;                while ((line=sr.ReadLine())!=null)   //读入文件下一行不为空                {                    this.richTextBox1.Text += line + "\r\n";    //读一行，换行                }                sr.Close();            }                    }        private void button2_Click(object sender, EventArgs e)        {            if (saveFileDialog1.ShowDialog()==DialogResult.OK)            {                string fileName = saveFileDialog1.FileName;                textBox1.Text = fileName;                StreamWriter sw = new StreamWriter(fileName);        //制定写入流                sw.Flush();            //清理缓冲区                //写入内容                sw.BaseStream.Seek(0, SeekOrigin.Begin);                sw.Write(richTextBox1.Text);          //将richTextBox内容写入文件                sw.Close();            }        }    }}

运行结果：

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