本文实例为大家分享了c#端口扫描器的编写代码，供大家参考，具体内容如下
一、项目设计
新建项目
整体设计
最终设计
二、单线程
1.代码编写
button
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.net.sockets;
using system.text;
using system.threading;
using system.threading.tasks;
using system.windows.forms;
namespace duankou
{
public partial class form1 : form
{
private string hostaddress;
//起始端口
private int start;
//终止端口
private int end;
//端口号
private int port;
//定义线程对象
private thread scanthread;
public form1()
{
initializecomponent();
}
private void label1_click(object sender, eventargs e)
{
}
private void label2_click(object sender, eventargs e)
{
}
private void label4_click(object sender, eventargs e)
{
}
private void button1_click(object sender, eventargs e)
{
try
{
//初始化
tbshow.clear();
lb.text = "0%";
//获取ip地址和始末端口号
hostaddress = tbhost.text;
start = int32.parse(tbsport.text);
end = int32.parse(tbeport.text);
if (decideaddress()) // 端口合理
{
//让输入的textbox只读，无法改变
tbhost.readonly = true;
tbsport.readonly = true;
tbeport.readonly = true;
//设置进度条的范围
pb.minimum = start;
pb.maximum = end;
//显示框显示
tbshow.appendtext("端口扫描器 v1.0.0" + environment.newline + environment.newline);
//调用端口扫描函数
portscan();
}
else
{
//若端口号不合理，弹窗报错
messagebox.show("输入错误，端口范围为[0-65536]!");
}
}
catch
{
//若输入的端口号为非整型，则弹窗报错
messagebox.show("输入错误，端口范围为[0-65536]!");
}
}
/// <summary>
/// 判断端口是否合理
/// </summary>
/// <returns></returns>
private bool decideaddress()
{
//判断端口号是否合理
if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
return true;
else
return false;
}
private void portscan()
{
double x;
string xian;
//显示扫描状态
tbshow.appendtext("开始扫描...（可能需要请您等待几分钟）" + environment.newline + environment.newline);
//循环抛出线程扫描端口
for (int i = start; i <= end; i++)
{
x = (double)(i - start + 1) / (end - start + 1);
xian = x.tostring("0%");
port = i;
//调用端口i的扫描操作
scan();
//进度条值改变
lb.text = xian;
lb.refresh();
pb.value = i;
}
tbshow.appendtext(environment.newline + "扫描结束！" + environment.newline);
//输入框textbox只读属性取消
tbhost.readonly = false;
tbsport.readonly = false;
tbeport.readonly = false;
}
/// <summary>
/// 扫描某个端口
/// </summary>
private void scan()
{
int portnow = port;
//创建tcpclient对象，tcpclient用于为tcp网络服务提供客户端连接
tcpclient objtcp = null;
try
{
//用于tcpclient对象扫描端口
objtcp = new tcpclient(hostaddress, portnow);
//扫描到则显示到显示框
tbshow.appendtext("端口 " + port + " 开放！" + environment.newline);
}
catch
{
//未扫描到，则会抛出错误
}
}
}
}
2.扫描结果
开始
1分钟结束 没有端口开放
三、多线程
1.代码编写
button
using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.linq;
using system.net.sockets;
using system.text;
using system.threading;
using system.threading.tasks;
using system.windows.forms;
namespace duankou
{
public partial class form1 : form
{
private string hostaddress;
//起始端口
private int start;
//终止端口
private int end;
//端口号
private int port;
//定义线程对象
private thread scanthread;
//定义端口状态数据（开放则为true，否则为false）
private bool[] done = new bool[65526];
private bool ok;
public form1()
{
initializecomponent();
//不进行跨线程检查
checkforillegalcrossthreadcalls = false;
}
private void label1_click(object sender, eventargs e)
{
}
private void label2_click(object sender, eventargs e)
{
}
private void label4_click(object sender, eventargs e)
{
}
private void button1_click(object sender, eventargs e)
{
try
{
//初始化
tbshow.clear();
lb.text = "0%";
//获取ip地址和始末端口号
hostaddress = tbhost.text;
start = int32.parse(tbsport.text);
end = int32.parse(tbeport.text);
if (decideaddress()) // 端口合理
{
//让输入的textbox只读，无法改变
tbhost.readonly = true;
tbsport.readonly = true;
tbeport.readonly = true;
//创建线程，并创建threadstart委托对象
thread process = new thread(new threadstart(portscan));
process.start();
//设置进度条的范围
pb.minimum = start;
pb.maximum = end;
//显示框显示
tbshow.appendtext("端口扫描器 v1.0.0" + environment.newline + environment.newline);
}
else
{
//若端口号不合理，弹窗报错
messagebox.show("输入错误，端口范围为[0-65536]!");
}
}
catch
{
//若输入的端口号为非整型，则弹窗报错
messagebox.show("输入错误，端口范围为[0-65536]!");
}
}
/// <summary>
/// 判断端口是否合理
/// </summary>
/// <returns></returns>
private bool decideaddress()
{
//判断端口号是否合理
if ((start >= 0 && start <= 65536) && (end >= 0 && end <= 65536) && (start <= end))
return true;
else
return false;
}
private void portscan()
{
double x;
string xian;
//显示扫描状态
tbshow.appendtext("开始扫描...（可能需要请您等待几分钟）" + environment.newline + environment.newline);
//循环抛出线程扫描端口
for (int i = start; i <= end; i++)
{
x = (double)(i - start + 1) / (end - start + 1);
xian = x.tostring("0%");
port = i;
//使用该端口的扫描线程
scanthread = new thread(new threadstart(scan));
scanthread.start();
//使线程睡眠
system.threading.thread.sleep(100);
//进度条值改变
lb.text = xian;
pb.value = i;
}
while (!ok)
{
ok = true;
for (int i = start; i <= end; i++)
{
if (!done[i])
{
ok = false;
break;
}
}
system.threading.thread.sleep(1000);
}
tbshow.appendtext(environment.newline + "扫描结束！" + environment.newline);
//输入框textbox只读属性取消
tbhost.readonly = false;
tbsport.readonly = false;
tbeport.readonly = false;
}
/// <summary>
/// 扫描某个端口
/// </summary>
private void scan()
{
int portnow = port;
//创建线程变量
thread threadnow = scanthread;
//扫描端口，成功则写入信息
done[portnow] = true;
//创建tcpclient对象，tcpclient用于为tcp网络服务提供客户端连接
tcpclient objtcp = null;
try
{
//用于tcpclient对象扫描端口
objtcp = new tcpclient(hostaddress, portnow);
//扫描到则显示到显示框
tbshow.appendtext("端口 " + port + " 开放！" + environment.newline);
}
catch
{
//未扫描到，则会抛出错误
}
}
}
}
2.扫描结果
开始
5秒结束
小结
多线程能够有更好的cpu使用率，程序设计更简单，更快的程序响应速度。
链接
c#单线程和多线程端口扫描器
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
