判断是否断网

这是一个判断是否断网的工具类：

//方法一对应的命名空间
using System.Runtime;
using System.Runtime.InteropServices;
//方法二对应的命名空间
using System.Net.NetworkInformation;

namespace WindowsFormsApplication1
{
/// <summary>
/// 判断是否连接网络
/// </summary>
public static class IsOffTheNet
{
#region 方法一
[DllImport("wininet.dll")]
private extern static bool InternetGetConnectedState(int Description, int ReservedValue);

/// <summary>
/// 用于检查网络是否可以连接互联网,true表示连接成功,false表示连接失败
/// </summary>
/// <returns></returns>
public static bool IsConnectInternet()
{
int Description = 0;
return InternetGetConnectedState(Description, 0);
}
#endregion

#region 方法二
/// <summary>
/// 用于检查IP地址或域名是否可以使用TCP/IP协议访问(使用Ping命令),true表示Ping成功,false表示Ping失败
/// </summary>
/// <param name="strIpOrDName">输入参数,表示IP地址或域名</param>
/// <returns></returns>
public static bool PingIpOrDomainName(string strIpOrDName)
{
try
{
Ping objPingSender = new Ping();
PingOptions objPinOptions = new PingOptions();
objPinOptions.DontFragment = true;
string data = "";
byte[] buffer = Encoding.UTF8.GetBytes(data);
int intTimeout = 120;
PingReply objPinReply = objPingSender.Send(strIpOrDName, intTimeout, buffer, objPinOptions);
string strInfo = objPinReply.Status.ToString();
if (strInfo == "Success")
{
return true;
}
else
{
return false;
}
}
catch (Exception)
{
return false;
}
}
#endregion
}