使用C#在Windows Mobile上获取网络状态

该示例代码展示了如何使用C#语言在Windows Mobile设备上获取当前的网络连接状态，包括是否连接到互联网，是否启用WLAN或数据网络等信息。实现方式为通过调用Win32API函数来获取网络状态。

using System.Runtime.InteropServices;

public class NetworkStatusHelper
{
    [DllImport("wininet.dll", SetLastError = true)]
    private static extern bool InternetGetConnectedState(out int description, int reservedValue);

    public static bool IsConnectedToInternet()
    {
        int desc;
        return InternetGetConnectedState(out desc, 0);
    }

    [DllImport("coredll.dll")]
    private static extern int SystemParametersInfo(int uiAction, int uiParam, ref int pvParam, int fWinIni);

    private const int SPI_GETWIFIRADIO = 257;

    public static bool IsWiFiEnabled()
    {
        int wifiEnabled = 0;
        SystemParametersInfo(SPI_GETWIFIRADIO, 0, ref wifiEnabled, 0);
        return wifiEnabled != 0;
    }

    [DllImport("cellcore.dll")]
    private static extern int CellCoreGetCurrentCellularClass();

    public static bool IsDataNetworkEnabled()
    {
        int cellularClass = CellCoreGetCurrentCellularClass();
        return cellularClass == 2 || cellularClass == 3 || cellularClass == 5;
    }
}

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