Ip Address Parse Problem in C#

Question

I am reading IPaddress from xml file and I put it into IPaddress.parse() and then use it but it does not work. it says "An invalid IP address was specified." but when I write it manually it works.

why I cant use IP address after reading xml file. I tried to erase "white spaces" , it said samething again.

string ipadd; //take ip address from xml and use
 ...
 IPAddress ipaddre = IPAddress.Parse(ipadd); 
------------------------------
 IPAddress ipaddre = IPAddress.Parse("255.255.255.255")

why these are not giving same result?

What is the exact value of ipadd that's passed to IPAddress.Parse? — Dr. Snoopy
– Dr. Snoopy, Commented Oct 21, 2010 at 16:45
I put value of ipadd to a label, it is same , both of them are 255.255.255.255 ... but I will try to debug and return back. — gheddo
– gheddo, Commented Oct 21, 2010 at 18:43
I think it has \n and \r characters , it makes error . thanks everyone :) — gheddo
– gheddo, Commented Oct 21, 2010 at 18:51
I think it has \n and \r characters +1 for that! I got this "An invalid IP address was specified." error when the IP address had a dodgy hidden trailing character, probably due to copy and pasting from somewhere else. Fixed by deleting and manually typing the IP address in again. — Aranda
– Aranda, Commented May 7, 2014 at 16:58

Justin Niessner · Accepted Answer · 2010-10-21 16:47:42Z

3

If ipadd == "255.255.255.255" then there should be nothing stopping that from working.

Obviously, though, ipadd != "255.255.255.255"

I would suggest debugging, setting a breakpoint, and inspecting the value of ipadd when you pass it to the IPAddress.Parse() method.

answered Oct 21, 2010 at 16:47

Justin Niessner

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Dekker500 · Accepted Answer · 2010-10-21 16:58:36Z

0

On the assumption that ipadd = "255.255.255.2552", then only two possibilities exist:

1) An exception is being thrown on the parse, and therefore your compare is not happening, or 2) The method you are using to compare the two results is not appropriate.

I strongly suggest you add both statements and place a breakpoint on the next line, then you will see exactly what you are dealing with:

IPAddress ipaddreReal = IPAddress.Parse(ipadd);
IPAddress ipaddreFake = IPAddress.Parse("255.255.255.255");
bool result = ipAddre.Real.Equals(ipaddreFake);

answered Oct 21, 2010 at 16:58

Dekker500

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