本文實例講述了C#獲取真實IP地址實現方法,分享給大家供大家參考。具體實現方法如下:
通常來說,大家獲取用戶IP地址常用的方法是:
if((HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"]!=null
&& HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] !=String.Empty) )
{
IpAddress=HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] ;
}
else
{
HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
}
事實上,上面的代碼只試用與用戶只使用了1層代理,如果用戶有2層,3層HTTP_X_FORWARDED_FOR 的值是:"本機真實IP,1層代理IP,2層代理IP,....." ,如果這個時候你的數據中保存IP字段的長度很?。?5個字節),數據庫就報錯了。
實際應用中,因為使用多層透明代理的情況比較少,所以這種用戶并不多。
獲取用戶真實IP的方法
public static Int64 toDenaryIp ( string ip )
{
Int64 _Int64 = 0;
string _ip = ip;
if ( _ip.LastIndexOf ( "." ) > -1 )
{
string[] _iparray = _ip.Split ( '.' );
_Int64 = Int64.Parse ( _iparray.GetValue ( 0 ).ToString() ) * 256 * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 1 ).ToString() ) * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 2 ).ToString() ) * 256 + Int64.Parse ( _iparray.GetValue ( 3 ).ToString() ) - 1;
}
return _Int64;
}
/// <summary>
/// /ip十進制
/// </summary>
public static Int64 DenaryIp
{
get {
Int64 _Int64 = 0;
string _ip = IP;
if ( _ip.LastIndexOf ( "." ) > -1 )
{
string[] _iparray= _ip.Split ( '.' );
_Int64 = Int64.Parse ( _iparray.GetValue ( 0 ).ToString() ) * 256 * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 1 ).ToString() ) * 256 * 256 + Int64.Parse ( _iparray.GetValue ( 2 ).ToString() ) * 256 + Int64.Parse ( _iparray.GetValue ( 3 ).ToString() )-1;
}
return _Int64;
}
}
public static string IP
{
get
{
string result = String.Empty;
result = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];
if ( result != null && result != String.Empty )
{
//可能有代理
if ( result.IndexOf ( "." ) == -1 ) //沒有"."肯定是非IPv4格式
result = null;
else
{
if ( result.IndexOf ( "," ) != -1 )
{
//有",",估計多個代理。取第一個不是內網的IP。
result = result.Replace ( " ", "" ).Replace ( "", "" );
string[] temparyip = result.Split ( ",;".ToCharArray() );
for ( int i = 0; i < temparyip.Length; i++ )
{
if ( IsIPAddress ( temparyip[i] )
&& temparyip[i].Substring ( 0, 3 ) != "10."
&& temparyip[i].Substring ( 0, 7 ) != "192.168"
&& temparyip[i].Substring ( 0, 7 ) != "172.16." )
{
return temparyip[i]; //找到不是內網的地址
}
}
}
else if ( IsIPAddress ( result ) ) //代理即是IP格式
return result;
else
result = null; //代理中的內容 非IP,取IP
}
}
string IpAddress = ( HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != null && HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] != String.Empty ) HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] : HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
if ( null == result || result == String.Empty )
result = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
if ( result == null || result == String.Empty )
result = HttpContext.Current.Request.UserHostAddress;
return result;
}
}
//是否ip格式
public static bool IsIPAddress ( string str1 )
{
if ( str1 == null || str1 == string.Empty || str1.Length < 7 || str1.Length > 15 ) return false;
string regformat = @"^//d{1,3}[//.]//d{1,3}[//.]//d{1,3}[//.]//d{1,3}$";
Regex regex = new Regex ( regformat, RegexOptions.IgnoreCase );
return regex.IsMatch ( str1 );
}
}
}
希望本文所述對大家的C#程序設計有所幫助。
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