在windows平台下，可以使用native wifi api来控制无线网卡，包括获取无线网卡参数，获取周围无线接入点参数等功能，在windows xp sp2版本的系统上，使用需要下载一个KB918997补丁包才能支持，下载地址如下：http://support.microsoft.com/kb/918997/en-us。而在xp sp3、vista、win7等高版本操作系统中，已经包含了此库，所以可以直接使用。
使用的api最好的文档当然是MSDN，地址如下：http://msdn.microsoft.com/en-us/library/ms706275(v=VS.85).aspx。里面详细介绍所用到的枚举类型、结构体、函数等，并且提供了非常好的实例代码。
如何用C#去操作无线网卡连接无线网络一直是个人学习过程中的一大困惑。好在最近成功解决了这个问题。最近在写一个中国电信ChinaNet无线热点自动连接工具，期间用到了Managed Wifi API，使用起来很是方便。
操作步骤很简单：
关于Managed Wifi API：This project is a .NET class library allowing you to control Wifi (802.11) network adapters installed in your Windows machine programmatically.
The library uses the Native Wifi API, available since Windows Vista and Windows XP SP2 (in a limited fashion, and only after applying a hotfix provided in KB article 918997). Older versions of Windows are not supported.
2.创建C#工程文件，并添加对ManagedWifi.dll的引用。
3.编写代码，引用“Native Wifi API”。 关键代码如下：
using System;
using System.Collections.Generic;
using System.Text;
using NativeWifi;
namespace ManagedWifiExample
{
class MyWifi
{
public List<WIFISSID> ssids = new List<WIFISSID>();
public MyWifi()
{
ssids.Clear();
}
static string GetStringForSSID(Wlan.Dot11Ssid ssid)
{
return Encoding.UTF8.GetString(ssid.SSID, 0, (int)ssid.SSIDLength);
}
/// <summary>
/// 枚举所有无线设备接收到的SSID
/// </summary>
public void ScanSSID()
{
WlanClient client = new WlanClient();
foreach (WlanClient.WlanInterface wlanIface in client.Interfaces)
{
// Lists all networks with WEP security
Wlan.WlanAvailableNetwork[] networks = wlanIface.GetAvailableNetworkList(0);
foreach (Wlan.WlanAvailableNetwork network in networks)
{
WIFISSID targetSSID = new WIFISSID();
targetSSID.wlanInterface = wlanIface;
targetSSID.wlanSignalQuality = (int)network.wlanSignalQuality;
targetSSID.SSID = GetStringForSSID(network.dot11Ssid);
//targetSSID.SSID = Encoding.Default.GetString(network.dot11Ssid.SSID, 0, (int)network.dot11Ssid.SSIDLength);
targetSSID.dot11DefaultAuthAlgorithm = network.dot11DefaultAuthAlgorithm.ToString();
targetSSID.dot11DefaultCipherAlgorithm = network.dot11DefaultCipherAlgorithm.ToString();
ssids.Add(targetSSID);
//if ( network.dot11DefaultCipherAlgorithm == Wlan.Dot11CipherAlgorithm.WEP )
//{
// Console.WriteLine( "Found WEP network with SSID {0}.", GetStringForSSID(network.dot11Ssid));
//}
//Console.WriteLine("Found network with SSID {0}.", GetStringForSSID(network.dot11Ssid));
//Console.WriteLine("dot11BssType:{0}.", network.dot11BssType.ToString());
//Console.WriteLine("dot11DefaultAuthAlgorithm:{0}.", network.dot11DefaultAuthAlgorithm.ToString());
//Console.WriteLine("dot11DefaultCipherAlgorithm:{0}.", network.dot11DefaultCipherAlgorithm.ToString());
//Console.WriteLine("dot11Ssid:{0}.", network.dot11Ssid.ToString());
//Console.WriteLine("flags:{0}.", network.flags.ToString());
//Console.WriteLine("morePhyTypes:{0}.", network.morePhyTypes.ToString());
//Console.WriteLine("networkConnectable:{0}.", network.networkConnectable.ToString());
//Console.WriteLine("numberOfBssids:{0}.", network.numberOfBssids.ToString());
//Console.WriteLine("profileName:{0}.", network.profileName.ToString());
//Console.WriteLine("wlanNotConnectableReason:{0}.", network.wlanNotConnectableReason.ToString());
//Console.WriteLine("wlanSignalQuality:{0}.", network.wlanSignalQuality.ToString());
//Console.WriteLine("-----------------------------------");
// Console.WriteLine(network.ToString());
}
}
} // EnumSSID
/// <summary>
/// 连接到未加密的SSID
/// </summary>
/// <param name="ssid"></param>
public void ConnectToSSID(WIFISSID ssid)
{
// Connects to a known network with WEP security
string profileName = ssid.SSID; // this is also the SSID
string mac = StringToHex(profileName); //
//string key = "";
//string profileXml = string.Format("<?xml version=\"1.0\"?><WLANProfile xmlns=\"http://www.microsoft.com/networking/WLAN/profile/v1\"><name>{0}</name><SSIDConfig><SSID><hex>{1}</hex><name>New{0}</name></SSID></SSIDConfig><connectionType>ESS</connectionType><MSM><security><authEncryption><authentication>open</authentication><encryption>none</encryption><useOneX>false</useOneX></authEncryption><sharedKey><keyType>networkKey</keyType><protected>false</protected><keyMaterial>{2}</keyMaterial></sharedKey><keyIndex>0</keyIndex></security></MSM></WLANProfile>", profileName, mac, key);
//string profileXml2 = "<?xml version=\"1.0\"?><WLANProfile xmlns=\"http://www.microsoft.com/networking/WLAN/profile/v1\"><name>Hacker SSID</name><SSIDConfig><SSID><hex>54502D4C494E4B5F506F636B657441505F433844323632</hex><name>TP-LINK_PocketAP_C8D262</name></SSID> </SSIDConfig> <connectionType>ESS</connectionType><connectionMode>manual</connectionMode><MSM> <security><authEncryption><authentication>open</authentication><encryption>none</encryption><useOneX>false</useOneX></authEncryption></security></MSM></WLANProfile>";
//wlanIface.SetProfile( Wlan.WlanProfileFlags.AllUser, profileXml2, true );
//wlanIface.Connect( Wlan.WlanConnectionMode.Profile, Wlan.Dot11BssType.Any, profileName );
string myProfileXML = string.Format("<?xml version=\"1.0\"?><WLANProfile xmlns=\"http://www.microsoft.com/networking/WLAN/profile/v1\"><name>{0}</name><SSIDConfig><SSID><hex>{1}</hex><name>{0}</name></SSID></SSIDConfig><connectionType>ESS</connectionType><connectionMode>manual</connectionMode><MSM><security><authEncryption><authentication>open</authentication><encryption>none</encryption><useOneX>false</useOneX></authEncryption></security></MSM></WLANProfile>", profileName, mac);
ssid.wlanInterface.SetProfile(Wlan.WlanProfileFlags.AllUser, myProfileXML, true);
ssid.wlanInterface.Connect(Wlan.WlanConnectionMode.Profile, Wlan.Dot11BssType.Any, profileName);
//Console.ReadKey();
}
/// <summary>
/// 字符串转Hex
/// </summary>
/// <param name="str"></param>
/// <returns></returns>
public static string StringToHex(string str)
{
StringBuilder sb = new StringBuilder();
byte[] byStr = System.Text.Encoding.Default.GetBytes(str); //默认是System.Text.Encoding.Default.GetBytes(str)
for (int i = 0; i < byStr.Length; i++)
{
sb.Append(Convert.ToString(byStr[i], 16));
}
return (sb.ToString().ToUpper());
}
}
class WIFISSID
{
public string SSID = "NONE";
public string dot11DefaultAuthAlgorithm = "";
public string dot11DefaultCipherAlgorithm = "";
public bool networkConnectable = true;
public string wlanNotConnectableReason = "";
public int wlanSignalQuality = 0;
public WlanClient.WlanInterface wlanInterface = null;
}
}
4.示例程序允许枚举当前网卡接收到的所有无线SSID，并支持接入开放认证（无密码）的无线热点。
5.其它
Wifi XML配置文件请参考微软文档
http://www.microsoft.com/networking/WLAN/profile/v1
C#编程使用Managed Wifi API连接无线SSID示例代码下载
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转载后个人遇到的问题：
设置WIFI密码后，不能设置和打开WIFI连接问题解决方案：
需要修改profileXml中的配置信息，要和WIFI设置的一样，不然不能设置和访问WIFI的哦！【个人测试经验】
本人的设置
string profileXml = string.Format("<?xml version=\"1.0\" encoding=\"US-ASCII\"?><WLANProfile xmlns=\"http://www.microsoft.com/networking/WLAN/profile/v1\"><name>{0}</name><SSIDConfig><SSID><name>{0}</name></SSID></SSIDConfig><connectionType>ESS</connectionType><connectionMode>auto</connectionMode><autoSwitch>false</autoSwitch><MSM><security><authEncryption><authentication>WPAPSK</authentication><encryption>AES</encryption><useOneX>false</useOneX></authEncryption><sharedKey><keyType>passPhrase</keyType><protected>false</protected><keyMaterial>{1}</keyMaterial></sharedKey></security></MSM></WLANProfile>", profileName, key);
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来源：https://www.cnblogs.com/tianciliangen/p/3727157.html