ASP.NET獲取客戶端IP及MAC地址很多時(shí)候非常必要的，像做投票、留言、評(píng)論 等系統(tǒng)的時(shí)候防止別人惡意操作，導(dǎo)致數(shù)據(jù)的虛假行。下面介紹獲取客戶端的IP和MAC地址的方法，僅供參考：

獲取客戶端IP:

private string GetClientIP()
{
?? string result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
?? if (null == result || result == String.Empty)
?? {
??? result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
?? }

?? if (null == result || result == String.Empty)
?? {
??? result = HttpContext.Current.Request.UserHostAddress;
?? }
?? return result;
}

獲取MAC地址:

[DllImport("Iphlpapi.dll")]
private static extern int SendARP(Int32 dest,Int32 host,ref Int64 mac,ref Int32 length);
[DllImport("Ws2_32.dll")]
private static extern Int32 inet_addr(string ip);

private void Page_Load(object sender, System.EventArgs e)
{
?? // 在此處放置用戶代碼以初始化頁(yè)面
?? try
?? {
??? string userip=Request.UserHostAddress;
??? string strClientIP = Request.UserHostAddress.ToString().Trim();
??? Int32 ldest = inet_addr(strClientIP); //目的地的ip
??? Int32 lhost = inet_addr("");?? //本地服務(wù)器的ip
??? Int64 macinfo = new Int64();
??? Int32 len = 6;
??? int res = SendARP(ldest,0, ref macinfo, ref len);
??? string mac_src=macinfo.ToString("X");
??? if(mac_src == "0")
??? {
???? if(userip=="127.0.0.1")
????? Response.Write ("正在訪問Localhost!");
???? else
????? Response.Write ("歡迎來自IP為" + userip + "的朋友！" + "<br>");
???? return;
??? }

??? while(mac_src.Length<12)
??? {
???? mac_src = mac_src.Insert(0,"0");
??? }

??? string mac_dest="";

??? for(int i=0;i<11;i++)
??? {
???? if (0 == (i % 2))
???? {
????? if ( i == 10 )
????? {
?????? mac_dest = mac_dest.Insert(0,mac_src.Substring(i,2));
????? }
????? else
????? {
?????? mac_dest ="-" + mac_dest.Insert(0,mac_src.Substring(i,2));
????? }
???? }
??? }

??? Response.Write ("歡迎來自IP為"+userip+ "<br>" + ",MAC地址為"+mac_dest+"的朋友！"

???? +?? "<br>");
?? }
?? catch(Exception err)
?? {
??? Response.Write(err.Message);
?? }
}