c# 网络验证

 #region 检查网络连接

        static bool exitResult = false;
        /// <summary>
        /// 检查网络连接
        /// add by wlzhang 2014年1月09日 21:33:40
        /// </summary>
        /// <returns>true为已连接，false为断开</returns>
        public static ResultMessage<bool, string> CheckInternetConnect()
        {
            ResultMessage<bool, string> result = new ResultMessage<bool, string>(false, "请检查网络状态...");
            Thread checkNetThread = new Thread(new ThreadStart(CheckNetState));
            checkNetThread.Start();
            checkNetThread.Join(5000);
            if (exitResult)
            {
                result = new ResultMessage<bool, string>(true, "");
            }
            return result;
        }
        /// <summary>
        /// 检查外网连接
        /// </summary>
        public static void CheckNetState()
        {
            if (IsConnected())
            {
                try
                {
                    Ping p = new Ping();
                    PingReply pr = p.Send("dev.voicecloud.cn");
                    if (pr.Status == IPStatus.Success)
                    {
                        exitResult = true;
                    }
                    else
                    {
                        exitResult = false;
                    }
                }
                catch (Exception e)
                {
                    e.GetBaseException();
                    exitResult = false;
                }
            }
            else
            {
                exitResult = false;
            }
        }

        [DllImport("wininet.dll")]
        private extern static bool InternetGetConnectedState(out int connectionDescription, int reservedValue);
        /// <summary>
        /// 检查内网连接
        /// </summary>
        /// <returns>true为已连接，false为断开</returns>
        private static bool IsConnected()
        {
            int I = 0;
            bool state = InternetGetConnectedState(out I, 0);
            return state;
        }

        #endregion

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Manage
{
    public class ResultMessage<T1, T2>
    {
        private T1 _t1;

        private T2 _t2;

        public T1 Result
        {
            get
            {
                return _t1;
            }
            set
            {
                _t1 = value;
            }
        }

        public T2 Message
        {
            get
            {
                return _t2;
            }
            set
            {
                _t2 = value;
            }
        }

        public ResultMessage(T1 result, T2 message)
        {
            _t1 = result;
            _t2 = message;
        }
    }
}