哪位大哥帮我转换一下:VB->C#

Question

Private Function getIP()    Dim strIPAddr
    If Request.ServerVariables("HTTP_X_FORWARDED_FOR") = "" OR InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), "unknown") > 0 Then
        strIPAddr = Request.ServerVariables("REMOTE_ADDR")
    ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",") > 0 Then
        strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",")-1)
    ElseIf InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";") > 0 Then
        strIPAddr = Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";")-1)
    Else
        strIPAddr = Request.ServerVariables("HTTP_X_FORWARDED_FOR")
    End If
    getIP = Trim(Mid(strIPAddr, 1, 30))
End Function

Answer 1

using Microsoft.VisualBasic;
Private void getIP()
{
    string strIPAddr;
    if (Request.ServerVariables("HTTP_X_FORWARDED_FOR") == "" || InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), "unknown") > 0)
    {
        strIPAddr = Request.ServerVariables("REMOTE_ADDR");
    }
    else
    {
       if (Microsoft.VisualBasic.InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",") > 0)
       {
          strIPAddr = Microsoft.VisualBasic.Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",")-1);
       }
       else
       {
           if (InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";") > 0)
           {
               strIPAddr = Microsoft.VisualBasic.Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";")-1);
           }
           else
           {
               strIPAddr = Request.ServerVariables("HTTP_X_FORWARDED_FOR");
           }
        }
     }
    getIP = Microsoft.VisualBasic.Trim(Microsoft.VisualBasic.Mid(strIPAddr, 1, 30));
}

Answer 2

may be have some problem, I'm not testPrivate void getIP()
========>
private void getIP()

Answer 3

//编译未出错,不代表能用 :P
private string getIP()
{
string strIPAddr="";
if(Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString() == "" || Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf("unknown")> 0 )
{
strIPAddr = Request.ServerVariables["REMOTE_ADDR"].ToString();
}
else if( Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf(",") > 0 )
{
strIPAddr = Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().Substring(0, Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf(",")-1);
}
else if(Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf(";") > 0 )
{
strIPAddr = Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().Substring(0, Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf(";")-1);
}
else
{
strIPAddr = Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
}
    
return strIPAddr.Trim().Substring(0, 29);
}

Answer 4

using System.Diagnostics;
using Microsoft.VisualBasic;
using System.Xml;
using System;
using System.Data;
using System.Windows.Forms;
using System.Collections;private object getIP()
{
object returnValue;

object strIPAddr;
if (Request.ServerVariables("HTTP_X_FORWARDED_FOR") == "" | Strings.InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), "unknown", 0) > 0)
{
strIPAddr = Request.ServerVariables("REMOTE_ADDR");
}
else if (Strings.InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",", 0) > 0)
{
strIPAddr = Strings.Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, Strings.InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ",", 0) -1);
}
else if (Strings.InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";", 0) > 0)
{
strIPAddr = Strings.Mid(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), 1, Strings.InStr(Request.ServerVariables("HTTP_X_FORWARDED_FOR"), ";", 0) -1);
}
else
{
strIPAddr = Request.ServerVariables("HTTP_X_FORWARDED_FOR");
}
returnValue = Strings.Trim(Strings.Mid(strIPAddr, 1, 30));
return returnValue;
}

Answer 5

未将对象引用设置到对象的实例。
private string getIP()
{
string strIPAddr="";
if(Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString() == "" || Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf("unknown")> 0 )
{
strIPAddr = Request.ServerVariables["REMOTE_ADDR"].ToString();
}
else if( Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf(",") > 0 )
{
strIPAddr = Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().Substring(0, Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf(",")-1);
}
else if(Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf(";") > 0 )
{
strIPAddr = Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().Substring(0, Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString().IndexOf(";")-1);
}
else
{
strIPAddr = Request.ServerVariables["HTTP_X_FORWARDED_FOR"].ToString();
}
    
return strIPAddr.Trim().Substring(0, 29);
}