C# 获取IP及判断IP是否在区间
话不多说，请看代码：
///<summary>
///获取客户端IP
///</summary>
///<returns></returns>
publicstaticstringGetClientIpAddress()
{
varhttpContext=HttpContext.Current;
if(httpContext.Request.ServerVariables==null)
{
returnnull;
}
varclientIp=httpContext.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]??httpContext.Request.ServerVariables["REMOTE_ADDR"];
try
{
foreach(varhostAddressinDns.GetHostAddresses(clientIp))
{
if(hostAddress.AddressFamily==AddressFamily.InterNetwork)
{
returnhostAddress.ToString();
}
}
foreach(varhostAddressinDns.GetHostAddresses(Dns.GetHostName()))
{
if(hostAddress.AddressFamily==AddressFamily.InterNetwork)
{
returnhostAddress.ToString();
}
}
}
catch(Exceptionex)
{
}
returnclientIp;
}
///<summary>
///ip是否在ip空间内
///</summary>
///<paramname="ip"></param>
///<paramname="ipSection"></param>
///<returns></returns>
publicstaticBooleanipExistsInRange(Stringip,StringipSection)
{
ipSection=ipSection.Trim();
ip=ip.Trim();
intidx=ipSection.IndexOf('-');
StringbeginIP=ipSection.Substring(0,idx);
StringendIP=ipSection.Substring(idx+1);
returngetIp2long(beginIP)<=getIp2long(ip)&&getIp2long(ip)<=getIp2long(endIP);
}
publicstaticlonggetIp2long(Stringip)
{
ip=ip.Trim();
String[]ips=ip.Split('.');
longip2long=0L;
for(inti=0;i<4;++i)
{
ip2long=ip2long<<8|Int64.Parse(ips[i]);
}
returnip2long;
}
publicstaticlonggetIp2long2(Stringip)
{
ip=ip.Trim();
String[]ips=ip.Split('.');
longip1=Int64.Parse(ips[0]);
longip2=Int64.Parse(ips[1]);
longip3=Int64.Parse(ips[2]);
longip4=Int64.Parse(ips[3]);
longip2long=1L*ip1*256*256*256+ip2*256*256+ip3*256+ip4;
returnip2long;
}
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