方式一：利用.NET自带的类库直接就可以获得
[c-sharp] view plaincopy
1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Web;
5. using System.Web.UI;
6. using System.Web.UI.WebControls;
7. //添加引用，并导入命名空间
8. using System.Management;
9. namespace WebApp
10. {
11. public partial class WebForm1 : System.Web.UI.Page
12. {
13. protected void Page_Load(object sender, EventArgs e)
14. {
15. Response.Write("计算机名称： " + System.Net.Dns.GetHostName() + "<br>");
16. //调用GetMacAddress函数，获取网卡地址信息
17. Response.Write("MAC地址： " + GetMacAddress());
18. }
19. /// <summary>
20. /// 获取网卡地址信息
21. /// </summary>
22. /// <returns></returns>
23. string GetMacAddress()
24. {
25. try
26. {
27. string mac = "";
28. ManagementClass mc = new ManagementClass("Win32_NetworkAdapterConfiguration");
29. ManagementObjectCollection moc = mc.GetInstances();
30. foreach (ManagementObject mo in moc)
31. {
32. if ((bool)mo["IPEnabled"] == true)
33. {
34. mac = mo["MacAddress"].ToString();
35. break;
36. }
37. }
38. moc = null;
39. mc = null;
40. return mac;
41. }
42. catch
43. {
44. return "unknow";
45. }
46. }
47. }
48. }
运行结果：
计算机名称： lenovo-05d886ff
MAC地址： 00:26:22:05:8C:C7
注意：上传到服务器测试，发现获得的是服务器的MAC地址
方式二：通过win32特性获得
优点：无需在客户端设置；
缺点：无法获取服务器的mac（经测试总为0，其实感觉没有必要获取服务器的mac，所以也不算缺点）（能否跨网段获取还没有测试）
[c-sharp] view plaincopy
1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Web;
5. using System.Web.UI;
6. using System.Web.UI.WebControls;
7. //导入命名空间
8. using System.Runtime.InteropServices;
9. namespace WebApp
10. {
11. public partial class WebForm2 : System.Web.UI.Page
12. {
13. [DllImport("Iphlpapi.dll")]
14. private static extern int SendARP(Int32 dest, Int32 host, ref Int64 mac, ref Int32 length);
15. [DllImport("Ws2_32.dll")]
16. private static extern Int32 inet_addr(string ip);
17. private void Page_Load(object sender, System.EventArgs e)
18. {
19. try
20. {
21. string userip = Request.UserHostAddress;
22. string strClientIP = Request.UserHostAddress.ToString().Trim();
23. Int32 ldest = inet_addr(strClientIP); //目的地的ip
24. Int64 macinfo = new Int64();
25. Int32 len = 6;
26. int res = SendARP(ldest, 0, ref macinfo, ref len);
27. string mac_src = macinfo.ToString("X");
28. if (mac_src == "0")
29. {
30. if (userip == "127.0.0.1")
31. {
32. Response.Write("正在访问Localhost!");
33. }
34. else
35. {
36. Response.Write("欢迎来自IP为" + userip + "的朋友！" + "<br>");
37. }
38. return;
39. }
40. while (mac_src.Length < 12)
41. {
42. mac_src = mac_src.Insert(0, "0");
43. }
44. string mac_dest = "";
45. for (int i = 0; i < 11; i++)
46. {
47. if (0 == (i % 2))
48. {
49. if (i == 10)
50. {
51. mac_dest = mac_dest.Insert(0, mac_src.Substring(i, 2));
52. }
53. else
54. {
55. mac_dest = "-" + mac_dest.Insert(0, mac_src.Substring(i, 2));
56. }
57. }
58. }
59. Response.Write("欢迎来自IP为" + userip + "<br>" + ",MAC地址为" + mac_dest + "的朋友！" + "<br>");
60. }
61. catch (Exception err)
62. {
63. Response.Write(err.Message);
64. }
65. }
66. }
67. }
运行结果：
正在访问Localhost!
注意：上传到服务器测试，发现获得的是服务器的MAC地址
方式三：通过javascript加载ActiveX来实现：
优点：任意获取mac地址（可以跨网段获取）；
缺点：需要在客户端浏览器中将activeX的选项全部打开，否则获取不到，所以不怎么稳定；
前台代码：（WebForm3.aspx）
[xhtml] view plaincopy
1. <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm3.aspx.cs" Inherits="WebApp.WebForm3" %>
2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
3. <html xmlns="http://www.w3.org/1999/xhtml" >
4. <head runat="server">
5. <title></title>
6. <mce:script language="javascript"><!--
7. document.write("<OBJECT id='locator' classid='CLSID:76A64158-CB41-11D1-8B02-00600806D9B6' VIEWASTEXT></OBJECT>");
8. document.write("<OBJECT id=foo classid=CLSID:75718C9A-F029-11d1-A1AC-00C04FB6C223></OBJECT>");
9. var MACAddr, IPAddr, sDNSName
10. function getObject(objObject, objAsyncContext) {
11. try {
12. if (MACAddr == null && objObject.IPEnabled) {
13. if (objObject.MACAddress != null && objObject.MACAddress != "undefined")
14. MACAddr = objObject.MACAddress;
15. if (objObject.IPEnabled && objObject.IPAddress(0) != null && objObject.IPAddress(0) != "undefined")
16. IPAddr = objObject.IPAddress(0);
17. if (objObject.DNSHostName != null && objObject.DNSHostName != "undefined")
18. sDNSName = objObject.DNSHostName;
19. }
20. }
21. catch (err)
22. { }
23. }
24. function setValue(hResult, pErrorObject, pAsyncContext) {
25. createTxt("txtMAC", MACAddr);
26. createTxt("txtIp", IPAddr);
27. createTxt("txtPCName", sDNSName);
28. }
29. function createTxt(txtName, txtValue) {
30. var macTxt = document.createElement("INPUT");
31. macTxt.name = txtName;
32. macTxt.value = txtValue;
33. macTxt.type = "hidden";
34. try {
35. document.forms[0].appendChild(macTxt);
36. }
37. catch (err) {
38. //获取失败
39. }
40. }
41. document.getElementById("foo").attachEvent("OnObjectReady", getObject);
42. document.getElementById("foo").attachEvent("OnCompleted", setValue);
43. try {
44. var service = locator.ConnectServer();
45. var MACAddr;
46. var IPAddr;
47. var DomainAddr;
48. var sDNSName;
49. service.Security_.ImpersonationLevel = 3;
50. service.InstancesOfAsync(foo, 'Win32_NetworkAdapterConfiguration');
51. }
52. catch (err) {
53. //获取失败
54. }
55.
56. // --></mce:script>
57. </head>
58. <body>
59. <form id="form1" runat="server">
60. <div>
61.
62. <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" />
63.
64. </div>
65. </form>
66. </body>
67. </html>
后台代码：（WebForm3.aspx.cs）
[c-sharp] view plaincopy
1. using System;
2. using System.Collections.Generic;
3. using System.Linq;
4. using System.Web;
5. using System.Web.UI;
6. using System.Web.UI.WebControls;
7. namespace WebApp
8. {
9. public partial class WebForm3 : System.Web.UI.Page
10. {
11. protected void Page_Load(object sender, EventArgs e)
12. {
13. }
14. /// <summary>
15. /// 获取mac地址
16. /// </summary>
17. /// <returns></returns>
18. public string GetMACs()
19. {
20. try
21. {
22. return Request.Form["txtMAC"].ToString();
23. }
24. catch
25. {
26. return "";
27. }
28. }
29. protected void Button1_Click(object sender, EventArgs e)
30. {
31. Response.Write(GetMACs());
32. }
33. }
34. }
运行提示:
启用未标记为可安全执行脚本的ActiveX
第一步：工具->Internet选项
第二步：安全->Internet->自定义级别
第三步：启用“对未标记为可安全执行脚本的ActiveX控件初始化并执行”，如下图所示：
运行结果：
总结：感觉第一种方法还是方便，第二种方法获得不到服务器的MAC地址，第三种方法还需设置，两个字“不爽”。