C#在局域网中获取活动IP地址,这在控制台应用程序中工作正常,它来自基于表单的应用程序我遇到错误,我是c#pls帮助的新手。获取非静态字段的错误对象引用
namespace WindowsFormsApplication1
{
public partial class Form1 : Form
{
private static List<Ping> pingers = new List<Ping>();
private static int instances = 0;
private static object @lock = new object();
private static int result = 0;
private static int timeOut = 250;
private static int ttl = 5;
public String IP;
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
IP = textBox1.Text;
string baseIP = "192.168.1.";
Console.WriteLine("Pinging 255 destinations of D-class in {0}*", baseIP);
CreatePingers(255);
PingOptions po = new PingOptions(ttl, true);
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
byte[] data = enc.GetBytes("abababababababababababababababab");
SpinWait wait = new SpinWait();
int cnt = 1;
Stopwatch watch = Stopwatch.StartNew();
foreach (Ping p in pingers)
{
lock (@lock)
{
instances += 1;
}
p.SendAsync(string.Concat(baseIP, cnt.ToString()), timeOut, data, po);
cnt += 1;
}
while (instances > 0)
{
wait.SpinOnce();
}
watch.Stop();
DestroyPingers();
Console.WriteLine("Finished in {0}. Found {1} active IP-addresses.", watch.Elapsed.ToString(), result);
Console.ReadKey();
}
public static void Ping_completed(object s, PingCompletedEventArgs e)
{
lock (@lock)
{
instances -= 1;
}
if (e.Reply.Status == IPStatus.Success)
{
IP = e.Reply.Address.ToString();
result += 1;
}
else
{
//Console.WriteLine(String.Concat("Non-active IP: ", e.Reply.Address.ToString()))
}
}
private static void CreatePingers(int cnt)
{
for (int i = 1; i <= cnt; i++)
{
Ping p = new Ping();
p.PingCompleted += Ping_completed;
pingers.Add(p);
}
}
private static void DestroyPingers()
{
foreach (Ping p in pingers)
{
p.PingCompleted -= Ping_completed;
p.Dispose();
}
pingers.Clear();
}
}
}
答案 0 :(得分:1)
您使用IP&#34;变量&#34;作为你班上的领域。
public String IP;
但您无法访问静态方法中的字段。据我所知,你的3种方法不需要是静态的。我想这是从控制台应用程序复制/粘贴的结果,您将方法编码为静态:)
所以你需要:
我建议你让所有成员都是非静态的,因为他们属于&#34;形式。
答案 1 :(得分:0)
您收到此错误是因为IP被声明为非静态字段并且正在静态方法中使用。
答案 2 :(得分:0)
最后这段代码可以使用。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.NetworkInformation;
using System.Threading;
using System.Diagnostics;
using System.Net;
namespace WindowsFormsApplication3
{
public partial class Form1 : Form
{
private static List<Ping> pingers = new List<Ping>();
private static int instances = 0;
private static object @lock = new object();
private static int result = 0;
private static int timeOut = 250;
private static int ttl = 5;
private static string[] IPs=new string[100];
public Form1()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
string baseIP = "192.168.1.";
IP.Items.Add("Pinging 255 destinations of D-class in " + baseIP+"xxx");
CreatePingers(255);
PingOptions po = new PingOptions(ttl, true);
System.Text.ASCIIEncoding enc = new System.Text.ASCIIEncoding();
byte[] data = enc.GetBytes("abababababababababababababababab");
SpinWait wait = new SpinWait();
int cnt = 1;
Stopwatch watch = Stopwatch.StartNew();
foreach (Ping p in pingers)
{
lock (@lock)
{
instances += 1;
}
p.SendAsync(string.Concat(baseIP, cnt.ToString()), timeOut, data, po);
cnt += 1;
}
}
public static void Ping_completed(object s, PingCompletedEventArgs e)
{
lock (@lock)
{
instances -= 1;
}
if (e.Reply.Status == IPStatus.Success)
{
Console.WriteLine(string.Concat("Active IP: ", e.Reply.Address.ToString()));
IPs[result] = e.Reply.Address.ToString();
result += 1;
}
else
{
//Console.WriteLine(String.Concat("Non-active IP: ", e.Reply.Address.ToString()))
}
}
private static void CreatePingers(int cnt)
{
for (int i = 1; i <= cnt; i++)
{
Ping p = new Ping();
p.PingCompleted += Ping_completed;
pingers.Add(p);
}
}
private static void DestroyPingers()
{
foreach (Ping p in pingers)
{
p.PingCompleted -= Ping_completed;
p.Dispose();
}
pingers.Clear();
}