来自于：婕舞飞扬

    1. /// <summary> ...... 
    2. /// <summary> 
    3. /// 获取当前请求的IP地址 
    4. /// </summary> 
    5. /// <returns></returns> 
    6. public static string GetIP() 
    7. { 
    8.    //获取IP地址 
    9.    HttpRequest request = HttpContext.Current.Request; 
    10.    string ipAddress=string.Empty; 
    11.    if(request.ServerVariables["HTTP_X_FORWARDED_FOR"]==null || request.ServerVariables["HTTP_X_FORWARDED_FOR"]=="") 
    12.    { 
    13.       ipAddress = request.ServerVariables["REMOTE_ADDR"]; 
    14.    } 
    15.    else if(request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(",")>=0) 
    16.    { 
    17.       int index = request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(","); 
    18.       ipAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"].Substring(0,index-1); 
    19.    } 
    20.    else if(request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(";")>=0) 
    21.    { 
    22.       int index = request.ServerVariables["HTTP_X_FORWARDED_FOR"].IndexOf(";"); 
    23.       ipAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"].Substring(0,index-1); 
    24.    } 
    25.    else 
    26.    { 
    27.       ipAddress = request.ServerVariables["HTTP_X_FORWARDED_FOR"]; 
    28.    } 
    29.    if(ipAddress=="127.0.0.1") 
    30.    { 
    31.       ipAddress = GetLocalhostIPAddress(); 
    32.    } 
    33.    return ipAddress; 
    34. } 
    35. /// <summary> 
    36. /// 获取本机IP 
    37. /// </summary> 
    38. /// <returns></returns> 
    39. private static string GetLocalhostIPAddress() 
    40. { 
    41.    string hostName = System.Net.Dns.GetHostName(); 
    42.    System.Net.IPHostEntry hostInfo =System.Net.Dns.GetHostByName(hostName); 
    43.    System.Net.IPAddress[]  IpAddr = hostInfo.AddressList;  
    44.    string localIP = string.Empty; 
    45.    for (int i = 0; i < IpAddr.Length; i++) 
    46.    { 
    47.       localIP += IpAddr[i].ToString(); 
    48.    }  
    49.    return localIP;                       
    50. }

    以上获取的IP地址有可能会使代理服务器的IP

    1. 在ASP.NET中专用属性：
      获取服务器电脑名: Page.Server.ManchineName
      获取用户信息: Page.User
      获取客户端电脑名：Page.Request.UserHostName
      获取客户端电脑IP: Page.Request.UserHostAddress

    2. 在网络编程中的通用方法:
      获取当前电脑名: static System.Net.Dns.GetHostName()
      根据电脑名取出全部IP地址: static System.Net.Dns.Resolve(电脑名).AddressList
      也可根据IP地址取出电脑名: static System.Net.Dns.Resolve(IP地址).HostName

    3. 系统环境类的通用属性:
      当前电脑名: static System.Environment.MachineName
      当前电脑所属网域: static System.Environment.UserDomainName
      当前电脑用户: static System.Environment.UserName