C# 检测当前网络状态

    [DllImport("wininet.dll")]
    private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);

    /// <summary>
    /// 检测网络是否连接
    /// </summary>
    /// <returns></returns>
    public static bool IsConnected()
    {
        int i = 0;
        bool state = InternetGetConnectedState(out i, 0);
        return state;
    }