C#读写文件高人速救

Question

启动一个线程，让其从指定文件中一秒钟读取一行数据并且读一条在textbox中同步显示一条，并非读完之后全部显示，而且前面显示过的内容就不再读取也不能清空textbox后再次显示。求解高人速救

Answer 1

    public partial class Form1 : Form
    {
        private Thread updateThread;        public Form1() {
            InitializeComponent();
        }
        private void button1_Click(object sender, EventArgs e) {
            updateThread =  new Thread(UpdateThread);
            updateThread.Start(@"D:\Test.txt");
        }        private void UpdateThread(object fileName) {
            using (StreamReader reader = new StreamReader(fileName as string)) {
                string line = null;
                while ((line = reader.ReadLine()) != null) {
                    textBox2.AppendText(line + "\r\n");
                    Thread.Sleep(1000);
                }
            }
        }        private void Form1_FormClosing(object sender, FormClosingEventArgs e) {
            updateThread.Abort();
        }
    }

Answer 2

        private void Start()
        {
            String strText = String.Empty;
            using (StreamReader sr = new StreamReader("D:\\1.txt"))
            {
                strText = sr.ReadLine();
                while (!strText.Equals("\0"))
                {
                    textBox1.Text += strText;
                    strText = sr.ReadLine();
                    Thread.Sleep(1000);
                }
                sr.Close();
            }
        }        private void button1_Click(object sender, EventArgs e)
        {
            Thread thread = new Thread(new ThreadStart(Start));
            thread.Start();
        }

Answer 3

        private void Start()
        {
            using (StreamReader sr = new StreamReader("D:\\1.txt"))
            {
                while (!sr.EndOfStream)
                {
                    textBox1.AppendText(sr.ReadLine());
                    Thread.Sleep(1000);
                }
            }
        }        private void button1_Click(object sender, EventArgs e)
        {
            Thread thread = new Thread(new ThreadStart(Start));
            thread.Start();
        }

Answer 4

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.IO;
using System.Text;
using System.Windows.Forms;namespace testForm
{
    public partial class Form1 : Form
    {
        public FileStream fs;
        public StreamReader sr;        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            fs = new FileStream(@"D:\aaa.txt", FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 1, true);
            sr = new StreamReader(fs);
            timer1.Interval = 1000;
            timer1.Enabled = true;
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            string readString = string.Empty;
            readString = sr.ReadLine();
            if (readString != null)
            {
                if (richTextBox1.Text == "")
                {
                    richTextBox1.Text = richTextBox1.Text + readString;
                }
                else
                {
                    richTextBox1.Text = richTextBox1.Text + "\r\n" + readString;
                }
            }
            else
            {
                sr.Close();
                fs.Close();
                timer1.Enabled = false;
            }
        }
    }
}

Answer 5

用定时器勾起一个线程，在form的Load事件中初始化fs和sr以及timer1的各项参数，读取文件的操作放到timer1的Tick事件中，内容放入一个RichTextBox中，当读取文件结束后关闭sr和fs，并设置timer1不可用。

Answer 6

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.IO;
using System.Text;
using System.Windows.Forms;namespace testForm
{
    public partial class Form1 : Form
    {
        //文件流
        public FileStream fs;
        //读取流
        public StreamReader sr;        public Form1()
        {
            InitializeComponent();
        }        private void Form1_Load(object sender, EventArgs e)
        {
            //以读权限打开D盘中的aaa.txt文件
            fs = new FileStream(@"D:\aaa.txt", FileMode.Open, FileAccess.Read, FileShare.ReadWrite, 1, true);
            //以fs初始化sr
            sr = new StreamReader(fs);
            //设置timer1的interval为1000毫秒，即1秒，意思是每过1秒钟触发一次timer1的Tick事件
            timer1.Interval = 1000;
            //设置timer1可用，默认情况下timer1不可用
            timer1.Enabled = true;
        }        private void timer1_Tick(object sender, EventArgs e)
        {
            //readString存放按行读取的数据
            string readString = string.Empty;
            //按行读取数据
            readString = sr.ReadLine();
            //readString != null即文件未读完
            if (readString != null)
            {
                if (richTextBox1.Text == "")
                {
                    //读取的数据是文件中的第一行数据
                    richTextBox1.Text = richTextBox1.Text + readString;
                }
                else
                {
                    //读取的数据不是文件中的第一行数据
                    richTextBox1.Text = richTextBox1.Text + "\r\n" + readString;
                }
            }
            else
            {
                //关闭sr
                sr.Close();
                //关闭fs
                fs.Close();
                //设置timer1不可用，即使timer1的Tick事件不会再被触发
                timer1.Enabled = false;
            }
        }
    }
}

Answer 7

+1 至于你的textbox 不太明白你想干嘛

Answer 8

        public Form1()
        {
            InitializeComponent();
            CheckForIllegalCrossThreadCalls = false;
        }        private void button1_Click(object sender, EventArgs e)
        {
            Thread thread = new Thread(new ThreadStart(Start));
            thread.Start();
        }        private void Start()
        {
            using (StreamReader sr = new StreamReader("D:\\a.txt"))
            {
                while (!sr.EndOfStream)
                {
                    textBox1.AppendText(sr.ReadLine() + "\r\n");
                    Thread.Sleep(1000);
                }
            }
        }
修改了下
进程间不可操作去掉了

Answer 9

加行号的话做如下修改(注意红字部分)：       //文件流
        public FileStream fs;
        //读取流
        public StreamReader sr;       //行号
        int lines=0;        private void timer1_Tick(object sender, EventArgs e)
        {
           //readString存放按行读取的数据
            string readString = string.Empty;
            //按行读取数据
            readString = sr.ReadLine();
            //readString != null即文件未读完
            if (readString != null)
            {
                lines++;                if (richTextBox1.Text == "")
                {
                    //读取的数据是文件中的第一行数据
                    richTextBox1.Text = richTextBox1.Text + readString;
                }
                else
                {
                    //读取的数据不是文件中的第一行数据
                    richTextBox1.Text = richTextBox1.Text + "\r\n" + readString;
                }
            }
            else
            {
                //关闭sr
                sr.Close();
                //关闭fs
                fs.Close();
                //设置timer1不可用，即使timer1的Tick事件不会再被触发
                timer1.Enabled = false;
            }
        }

Answer 10

颜色没起作用，你就和上面的对比着看吧，其实就是在公共变量定义里面定义了一个行号lines，在timer的tick事件里面每次读取一行就对lines加1。

Answer 11

timer的tick事件有误，还应该做如下修改：                if (richTextBox1.Text == "")
                {
                    //读取的数据是文件中的第一行数据
                    richTextBox1.Text = lines.ToString() + ":" + richTextBox1.Text + readString;
                }
                else
                {
                    //读取的数据不是文件中的第一行数据
                    richTextBox1.Text = lines.ToString() + ":" + richTextBox1.Text + "\r\n" + readString;
                }