HKCard/HKHelper/HKHelper.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace HKHelper
{

    public class Singleton<T> where T : new()
    {
        private static object _async = new object();

        private static T _instance;

        static readonly Lazy<T> instance = new();
        /// <summary>
        /// 获取实例
        /// </summary>
        /// <returns></returns>
        public static T GetInstance()
        {
            return instance.Value;
        }
    }


    public class HKHelper : Singleton<HKHelper>
    {
        /// <summary>
        /// 判断网络状况的方法,返回值true为连接，false为未连接  
        /// </summary>
        /// <param name="conState"></param>
        /// <param name="reder"></param>
        /// <returns></returns>
        [DllImport("wininet")]
        public extern static bool InternetGetConnectedState(out int conState, int reder);
        /// <summary>
        /// 获取当前网络连接状态
        /// </summary>
        /// <returns>成功连接网络返回 true,未连接返回 false</returns>
        public bool GetNetworkState()
        {
            return InternetGetConnectedState(out int i, 0);
        }

    }
}