host文件的修改

在最近的项目当中，需要修改host文件来实现网址拦击，不说了直接上代码：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace 文件读写

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

string st = textBox1.Text;

FileStream fs = null;

string filePath = @"C:\windows\system32\drivers\etc" + "\\hosts";

//将待写的入数据从字符串转换为字节数组

Encoding encoder = Encoding.UTF8;

byte[] bytes = encoder.GetBytes("\n "+st+"\n\r");

try

{

fs = File.OpenWrite(filePath);

//设定书写的开始位置为文件的末尾

fs.Position = fs.Length;

//将待写入内容追加到文件末尾

fs.Write(bytes, 0, bytes.Length);

}

catch (Exception ex)

{

MessageBox.Show("xi");

}

finally

{

fs.Close();

}

//写入代码（去掉原有内容）

//StreamWriter sw = new StreamWriter(@"C:\Users\lgh\Desktop" + "\\hosts");//创建StreamWriter对象sw

//sw.Write(this.textBox1.Text);//把this.textBox2.Text这字符串写入到 sw里

//sw.Dispose();//释放流。



}

private void button2_Click(object sender, EventArgs e)

{

string str;

StreamReader sr = new StreamReader(@"C:\windows\system32\drivers\etc" + "\\hosts", false);

str = sr.ReadToEnd().ToString();

sr.Close();

this.textBox2.Text = str;///读取

}

}

}

在运行要注意权限问题，希望对大家有帮助