Cannot access a non-static member of outer type via nested type

[bind]

Hello Experts,

I'm desperately seeking assistance with this issue I'm having.

I'm getting the following error:

Cannot access a non-static member of outer type 'BindsTools.PortScanner' via nested type 'BindsTools.PortScanner.PortScannerr'

I've been banging my head against a wall, I've looked up outer and inner types examples but just can't seem to get this working properly.

Can anyone assist me with this?

Thank you much!

And the code for the C#.net form is:

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;
using System.Net.Sockets;
using System.Threading;

namespace BindsTools
{
public partial class PortScanner : Form
{
public PortScanner()
{
InitializeComponent();
}
public void AddHeaderInformation(string name, string value)
{
ListViewItem lvi = this.listView1.Items.Add(name);
lvi.SubItems.Add(value);
}
private void button1_Click(object sender, EventArgs e)
{
string host;
int portStart = 1, portStop = 65535, ctrThread = 200;

host = textBox1.Text;

portStart = int.Parse(textBox2.Text);
portStop = int.Parse(textBox3.Text);
ctrThread = int.Parse(textBox4.Text);



PortScannerr ps = new PortScannerr(host, portStart, portStop);
ps.start(ctrThread);
}

public class PortScannerr
{
private string host;
private PortList portList;

public PortScannerr(string host, int portStart, int portStop)
{
this.host = host;
this.portList = new PortList(portStart, portStop);
}

public PortScannerr(string host)
: this(host, 1, 65535)
{
}

public PortScannerr()
: this("127.0.0.1")
{
}

public void start(int threadCtr)
{
for (int i = 0; i < threadCtr; i++)
{
Thread th = new Thread(new ThreadStart(run));
th.Start();
}
}
public void run()
{
int port;
TcpClient tcp = new TcpClient();
while ((port = portList.getNext()) != -1)
{
try
{
tcp = new TcpClient(host, port);
}
catch
{

continue;
}
finally
{
try
{
tcp.Close();
}
catch { }
}
//PortScanner oc = new PortScanner;

//MessageBox.Show(port.ToString() + " is open");
AddHeaderInformation(port.ToString(), "open");
}
}
}
public class PortList
{
private int start;
private int stop;
private int ptr;

public PortList(int start, int stop)
{
this.start = start;
this.stop = stop;
this.ptr = start;
}
public PortList()
: this(1, 65535)
{
}

public bool hasMore()
{
return (stop - ptr) >= 0;
}
public int getNext()
{
if (hasMore())
return ptr++;
return -1;
}
}
}
}

 

[jmeckley]

AddHeaderInformation(port.ToString(), "open");
is causing the problem. PortScannerr has no information about PortScanner and therefore cannot access AddHeaderInformation.

have PortScannerr return a string and have PortScanner add the header information. option 2; pass the instance of PortScanner to PortScannerr and call AddHeaderInformation.

I wouldn't nest the classes either, there is not value with nesting.

Jason Meckley
Programmer
Specialty Bakers, Inc.

faq855-7190
faq732-7259

 

[bind]

forgive my ignorance, would you be so kind as to show me an example of the above applied to my project?

thanks again

 

[jmeckley]

you know what, once you solve this problem you will encounter another issue. You will attempt to update the UI from a background thread. this will throw an exception because the UI can only be updated from the main thread. if you want to push work to a background thread then you will need to synchronize the background thread to the UI thread. I have an FAQ on asynchronous UI calls. the link is below in my signature.

here is an example of returning the string

public void DoSomething()
{
   var instance = new Thing();
   var result = instance.DoWork(args);
   ProcessResult(result);
}

private void ProcessResult(string text)
{
   //do something with the text
}

here is an example of passing an instance of itself to another class.

class Foo
{
public void DoSomething()
{
   var instance = new Thing(this);
   var result = instance.DoWork(args);
   ProcessResult(result);
}

private void ProcessResult(string text)
{
   //do something with the text
}
}
[code]
class Thing would look like this
[code]
class Thing
{
   readonly Foo dependency;
   pubic Thing(Foo dependency)
   {
        this.dependency = dependency;
   }

   public string DoWork(...)
   {
       return "text";
   }
}

Jason Meckley
Programmer
Specialty Bakers, Inc.

faq855-7190
faq732-7259