C# 网络连接判断(6)

if(!InternetGetConnectedState(ref dwFlag, 0))

MessageBox.Show("未连网!");

else

if((dwFlag& INTERNET_CONNECTION_MODEM)!=0)

MessageBox.Show("采用调治解调器上网。");

else

if((dwFlag& INTERNET_CONNECTION_LAN)!=0)

MessageBox.Show("采用网卡上网。");

}

楼上的方案属于非完全性方案,判断发包是否成功.这样永远都会有Bug的.

方法3

usingSystem.Runtime.InteropServices;

privateconst long INTERNET_CONNECTION_MODEM = 1;//Local system uses a modem to connect to the Internet.

privateconst long INTERNET_CONNECTION_LAN = 2; //Local system uses a local area network to connect to the Internet.

privateconst long INTERNET_CONNECTION_PROXY = 4;//Local system uses a proxy server to connect to the Internet.

privateconst long INTERNET_CONNECTION_MODEM_BUSY = 8; //No longer used.

privateconst long INTERNET_CONNECTION_CONFIGURED = 64; //Local system has a valid connection to the Internet, but it might or might not be currently connected.

privateconst long INTERNET_CONNECTION_OFFLINE = 32; // Local system is in offline mode.

privateconst long INTERNET_RAS_INSTALLED = 16; //Local system has RAS installed.

[DllImport("wininet.dll")]

public static extern boolInternetGetConnectedState(out long lpdwFlags, long dwReserved);

protected void Page_Load(object sender, EventArgs e)

{

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