C # dynamically allocate IP addresses and release IP addresses

C # dynamically allocate IP addresses and release IP addresses. Recently, you need to dynamically allocate and release IP addresses. It is easy to implement in C ++. However, because of the Network IPThe configuration involves hardware, and C # does not have a ready-made interface to call. You can only call an API or WMIThis system provides us with a bridge, mainly through" Win32_NetworkAdapterConfiguration"This management class.

The Demo I wrote is attached below. I hope it will help my friends who need it, and I also hope that experts can make bricks.

Using System;
Using System. Collections. Generic;
Using System. Text;
Using System. Management;
Using System. Management. Instrumentation;
Using System. Collections;
Namespace J_Queen
{
Class Program
{
Static void Main (string [] args)
{
Dictionary <string, ManagementObject> allDevices = new Dictionary <string, ManagementObject> (); // Save the management object
List <string> listDescription = new List <string> (); // Save the NIC description

// Obtain management instance and management object
ManagementClass classInstance = new ManagementClass ("Win32_NetworkAdapterConfiguration ");
ManagementObjectCollection bjectCollection = classInstance. GetInstances ();

Foreach (ManagementObject obj in objectCollection)
{
// Skip this step if no network device with IP settings Enabled
If (! (Bool) obj ["IPEnabled"])
{
Continue;
}

// Store related information
AllDevices. Add (string) obj ["Description"], obj );
ListDescription. Add (string) obj ["Description"]);
}
For (int I = 0; I <listDescription. Count; I ++)
{
Console. WriteLine (I. ToString () + ":" + listDescription [I]);
}
Console. Write ("Enter the number (q: Quit) and select NIC :");
String xInput = Console. ReadLine ();
Int deviceNumber;
While (xInput! = "Q ")
{
If (! Int32.TryParse (xInput, out deviceNumber ))
{
Console. Write ("input error, re-input :");
XInput = Console. ReadLine ();
Continue;
}
If (deviceNumber> listDescription. Count-1 | deviceNumber <0)
{
Console. Write ("the number entered exceeds the range. re-enter :");
XInput = Console. ReadLine ();
Continue;
}
If (allDevices. ContainsKey (listDescription [deviceNumber])
{
Console. WriteLine ("1: Release IP (Release), 2: Re-obtain IP (Renew )");
String ptionInput = Console. ReadLine ();
Int option;
If (Int32.TryParse (optionInput, out option ))
{
If (option = 1)
{
Int returnValue = IpRelease (ManagementObject) allDevices [listDescription [deviceNumber]);
If (returnValue <2)
{
Console. WriteLine ("successfully released IP Address ");
Console. Write ("Enter the number of the NIC above (q: Quit), select NIC :");
XInput = Console. ReadLine ();
Continue;
}
}
Else if (option = 2)
{
Int returnValue = IpRenew (ManagementObject) allDevices [listDescription [option]);
If (returnValue <2)
{
Console. WriteLine ("IP allocated successfully ");
Console. Write ("Enter the number of the NIC above (q: Quit), select NIC :");
XInput = Console. ReadLine ();
Continue;
}
}
Else
{
Console. WriteLine ("incorrect selection ");
Console. Write ("Enter the number of the NIC above (q: Quit), select NIC :");
Console. ReadLine ();
Continue;
}
}
}
}
}
/// <Summary>
/// Function: reassign the IP address of the specified Nic
/// </Summary>
/// <Param name = "obj"> ManagementObject obj -- the management object of the corresponding Nic </param>
/// <Returns> return value, integer, 0, and 1 indicate success </returns>
Public static int IpRenew (ManagementObject obj)
{
ManagementBaseObject utPar = null;
UtPar = obj. InvokeMethod ("RenewDHCPLease", null, null );
Return Convert. ToInt32 (outPar ["returnValue"]);
}
/// <Summary>
/// Function: releases the IP address of the specified Nic.
/// </Summary>
/// <Param name = "obj"> ManagementObject obj -- the management object of the corresponding Nic </param>
/// <Returns> return value, integer, 0, and 1 indicate success </returns>
Public static int IpRelease (ManagementObject obj)
{
ManagementBaseObject utPar = null;
UtPar = obj. InvokeMethod ("ReleaseDHCPLease", null, null );
Return Convert. ToInt32 (outPar ["returnValue"]);
}
}
}

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