asp.net(C#) 如何截取ip地址
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例如，获得的 ip 地址为 202.34.66.212
我想在页面显示 202.34.66.*
asp.net(C#) 应该怎么做呢？
原理:首先查找字符串最后一个"."的位置，然后再删除最后一个点后面的字符再加个"*"
举例：
string ip = Request.UserHostAddress;
ip=ip.Remove(ip.LastIndexOf('.')+1)+"*";
Response.Write(ip);
以上本机输出结果为127.0.0.*
当然你要不用Remove而用SubString截取最后个"."前的字符串加*也是可以的。
甚至你可以写个for语句再来一个一个字符的读，发现有三个"."后就不读了，然后+"*"，
甚至你还可以从字符后面读起碰到一个"."就跳出...
提供些思路自己领悟吧，C#处理字符串很强的 参考技术A 这不就是一个字符的操作嘛
...
string strIP = "202.34.66.212";
int position = strIP.LastIndexOf(".");
string result = strIP.SubString(0, position + 1) + @".*";
...
大概就是这个思路，呵呵，你可以再修改下下 :)
推荐一些资料你，参考一下：
ASP.NET1.x/2.0电子资料汇总：
O'Reilly Silverlight 1.1简介
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=163145
Wrox出版 Silverlight 1.0 (彩页染色代码、全面解析)
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=165953
Silverlight 1.0 Development with javascript
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=163268
Sams出版 Silverlight 1.0 Unleashed
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=162975
Silverlight and ASP.NET Revealed
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=174174
O'Reilly Essential Silverlight
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=163266
XAML简明教程 CHM+PDF版
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=163430
Pro ASP.NET 3.5 in C# 2008
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=166640
Beginning ASP.NET 3.5 in VB 2008 从入门到精通
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=166774
Wrox ASP.NET 2.0 MVP Hacks and Tips
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=163467
Professional ASP.NET.2.0 Design
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=160236
Professional Web Parts and Custom Controls with ASP.NET 2.0
http://bbs.topsage.com/dispbbs.asp?BoardID=123&ID=162787
ASP.NET2.0入门经典
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=146151
ASP.NET 2.0 技术内幕 微软技术丛书 清华大学出版
http://bbs.topsage.com/dispbbs_123_171293_1.html
Wrox ASP.NET 2.0 Visual Web Developer 2005 Express Edition Starter
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=145208
Beginning ASP.NET 2.0 in C# 2005 From Novice to Professional
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=145396
Wrox Professional ASP.NET 2.0
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=145202
Wrox Professional ASP.NET 2.0 XML
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=145197
Wrox Professional ASP.NET 2.0 Security Membership and Role Management
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=145198
Wrox Beginning ASP.NET 2.0 and Databases
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=147078
Pro ASP.NET 2.0 in VB 2005
http://bbs.topsage.com/dispbbs.asp?boardID=121&ID=173790
ASP.NET开发人员手册
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=145391
ASP.NET 2.0网络编程入门到精通
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=145342
ASP.NET Web应用程序开发新思维
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=145302
ASP.NET 2.0高级应用程序设计专家教程
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=146379
ASP.NET XML高级编程 C#编程篇
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=148800
ASP.NET程序开发 C#篇
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=159285
ASP.NET XML深入编程技术
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=148795
ASP.NET 2.0 Cookbook
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=151984
ASP.NET 2.0 Everyday Apps for Dummies
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=158103
Pro ASP.NET for SQL Server
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=167279
ASP.NET 从入门到精通
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=159331
Wrox Beginning ASP.NET 1.1 with Visual C#.NET 2003
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=160240
ASP.NET 2.0 揭秘
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=160249
Build Your Own ASP.NET 2.0 Web Site Using C# and VB
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=163143
开发Microsoft ASP.NET 2.0网络应用程序
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=160473
Pro ASP.NET 2.0 Website Programming
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=174179
开发ASP.NET 2.0 核心参考
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=160474
Building Websites with VB.NET and DotNetNuke 4
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=160639
Wrox出版 Professional DotNetNuke 4.0
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=166008
Professional DotNetNuke ASP.NET Portals
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=163399
Ajax，ASP.NET Ajax电子资料汇总：
Ajax基础教程
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=144263
Ajax宝典
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=148421
Wrox Beginning Ajax
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=146082
Ajax in Practice
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=145551
Ajax模式最佳实践教程
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=146080
Wrox Professional Rich Internet Applications AJAX and Beyond
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=160608
O'Reilly Ajax on Java
http://bbs.topsage.com/dispbbs.asp?boardID=121&ID=160600
Practical JavaScript DOM Scripting and Ajax Projects
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=150277
Creating Web Pages with Asynchronous Javascript and XML
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=162038
O'Reilly Securing Ajax Applications
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=162009
Advanced Ajax Architecture and Best Practices
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=163068
Beginning ASP.NET 2.0 AJAX
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=151273
Introducing Microsoft ASP.NET AJAX
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=144519
Wrox Professional ASP.NET 2.0 AJAX
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=146172
O'Reilly Programming ASP.NET Ajax
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=172105
ASP.NET AJAX Programmer's Reference
http://bbs.topsage.com/dispbbs.asp?boardID=123&ID=163394
ASP.NET获取客户端IP及MAC地址
朋友最近问如何获取客户端IP及MAC地址，一直想把这段给整理一下，契机来了；下边分为了C#后台获取的方法和前台Javascript(调用ActiveX)获取的方法，大家如果有好的方法一起讨论撒O(∩_∩)O
C#代码获取：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Runtime.InteropServices;
namespace MyTest
public partial class mac : System.Web.UI.Page
[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);
protected void Page_Load(object sender, EventArgs e)
GetMac();
//获取客户端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;
//获取MAC地址
private void GetMac()
// 在此处放置用户代码以初始化页面
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(""); //本地服务器的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("正在访问Localhost!");
else
Response.Write("欢迎来自IP为" + userip + "的朋友！" + "
");
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("欢迎来自IP为" + userip + "
" + ",MAC地址为" + mac_dest + "的朋友！"
+ "
");
catch (Exception err)
Response.Write(err.Message);
Javascript获取：
<HTML><HEAD><TITLE>WMI Scripting HTMLTITLE>
<META http-equiv=Content-Type content="text/html; charset=gb2312">
<SCRIPT language=JScript event="OnCompleted(hResult,pErrorObject, pAsyncContext)" for=foo>
document.forms[0].txtMACAddr.value=unescape(MACAddr);
document.forms[0].txtIPAddr.value=unescape(IPAddr);
document.forms[0].txtDNSName.value=unescape(sDNSName);
//document.formbar.submit();
SCRIPT>
<SCRIPT language=JScript event=OnObjectReady(objObject,objAsyncContext) for=foo>
if(objObject.IPEnabled != null && objObject.IPEnabled != "undefined" && objObject.IPEnabled == true)
if(objObject.MACAddress != null && objObject.MACAddress != "undefined")
MACAddr = objObject.MACAddress;
if(objObject.IPEnabled && objObject.IPAddress(0) != null && objObject.IPAddress(0) != "undefined")
IPAddr = objObject.IPAddress(0);
if(objObject.DNSHostName != null && objObject.DNSHostName != "undefined")
sDNSName = objObject.DNSHostName;
SCRIPT>
<META content="MSHTML 6.00.2800.1106" name=GENERATOR>HEAD>
<BODY>
<OBJECT id=locator classid=CLSID:76A64158-CB41-11D1-8B02-00600806D9B6 VIEWASTEXT>OBJECT>
<OBJECT id=foo classid=CLSID:75718C9A-F029-11d1-A1AC-00C04FB6C223>OBJECT>
<SCRIPT language=JScript>
var service = locator.ConnectServer();
var MACAddr ;
var IPAddr ;
var DomainAddr;
var sDNSName;
service.Security_.ImpersonationLevel=3;
service.InstancesOfAsync(foo, 'Win32_NetworkAdapterConfiguration');
SCRIPT>
<FORM id=formfoo name=formbar action=NICPost.asp method=post><INPUT value=00:05:5D:0E:C7:FA name=txtMACAddr> <INPUT value=192.168.0.2 name=txtIPAddr> <INPUT value=typ name=txtDNSName> FORM>BODY>HTML>
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