c# - 使用托管 API 关闭 WiFi 连接

Question

我正在使用 Managed WiFi API 编写程序.以下是我如何获得范围内的所有网络:

    void UpdateNetworks()
    {
        networks = new List<Wlan.WlanAvailableNetwork>();
        WlanClient client = new WlanClient();
        foreach(WlanClient.WlanInterface iface in client.Interfaces)
        {
            Wlan.WlanAvailableNetwork[] nets = iface.GetAvailableNetworkList(0);
            foreach(Wlan.WlanAvailableNetwork net in nets)
                networks.Add(net);
        }
    }

问题是调用此方法 18 次后我无法再连接:

(0x80004005): An attempt was made to establish a session to a network server, but there are already too many sessions established to that server.

这是抛出异常的构造函数:

    public WlanClient()
    {
        Wlan.ThrowIfError(
            Wlan.WlanOpenHandle(Wlan.WLAN_CLIENT_VERSION_XP_SP2, IntPtr.Zero, out negotiatedVersion, out clientHandle));
        try
        {
            Wlan.WlanNotificationSource prevSrc;
            wlanNotificationCallback = new Wlan.WlanNotificationCallbackDelegate(OnWlanNotification);
            Wlan.ThrowIfError(
                Wlan.WlanRegisterNotification(clientHandle, Wlan.WlanNotificationSource.All, false, wlanNotificationCallback, IntPtr.Zero, IntPtr.Zero, out prevSrc));
        }
        catch
        {
            Wlan.WlanCloseHandle(clientHandle, IntPtr.Zero);
            throw;
        }
    }

我相信这是因为客户端永远不会关闭它打开的连接。如何明确关闭它们？ catch block 中有句柄关闭，但它需要访问客户端的私有(private)部分。

Answer 1

我也遇到了同样的问题。我尝试了 Joe White 先生的解决方案，但收到一个错误消息，指出 wlanClient 无法转换为 System.IDisposable。
由于此问题与 WlanClient 实例的处理有关，因此我只将 1 个实例定义为类成员，并在方法 [void UpdateNetworks()] 中多次使用它。我没有收到任何错误。
删除行

WlanClient client = new WlanClient();

从您的方法中获取并在您的类中定义它。像下面这样:

public partial class frm_main : Form
{
     private WlanClient client = new WlanClient();

     private void UpdateNetworks()
     {
         var networks = new List<Wlan.WlanAvailableNetwork>();
         foreach (WlanClient.WlanInterface iface in client.Interfaces)
         {
             Wlan.WlanAvailableNetwork[] nets = iface.GetAvailableNetworkList(0);
             foreach (Wlan.WlanAvailableNetwork net in nets)
                 networks.Add(net);
         }
         MessageBox.Show(networks.Count.ToString());
     }
}

引用:Managed WiFi error