How to make comparison of multiple values

Question

Hello, I have made a form where the user can enter the ip address and save it in a notepad the same values are retrieved again.Now I want to see whether the ip address are correct and need to pass it in a method Plzz need your advice !

Francis · Answer

i want the user to add some ip's which can be more than 2 and need to compare this ip's one by one with a method...how to do this?? is it possible with an array?how to compare each value one by one with method I assumed that you are using string array. string[] ipAddresArray = { "192.176.3.3", "192.176.3.2", "192.176.13.3", }; // Will return the searched IP from the array string[] arr=Array.FindAll(ipAddresArray, element => element.Contains("192.176.3.3")); // check the length to find how many times it occurs if(arr.Length > 1) { // do your action } Hope this helps!

Rohit Nair · Answer

@Rajeesh Menoth thanks a lot its working but i am expecting some other solution...i want the user to add some ip's which can be more than 2 and need to compare this ip's one by one with a method...how to do this?? is it possible with an array?how to compare each value one by one with method

Rajeesh Menoth · Answer

Hi, foreach (var ipLine in File.ReadAllLines("proxy.txt")) { var ip = IPAddress.Parse(ipLine); if (ip.AddressFamily.ToString() == "InterNetwork") { localIP = ip.ToString(); textBox1 .Text = ip.ToString(); } } Reference : http://stackoverflow.com/questions/12037772/how-to-convert-string-to-system-net-ipaddress

Raghav Jhavar · Answer

Hi Rohit, Suppose the user is entering the IP Address in 'textBox1', this will be the syntax: using System.Net; try { IPAddress.Parse(textBox1.Text); MessageBox.Show("Valid IP"); } catch (Exception ex) { MessageBox.Show("Invalid IP!

Error: " + ex.Message); } That is to check if the IP is valid. After it is checked, you can put it in a notepad file using this code: using(var writeIPtoFile = new StreamWriter("someFile.txt", true)) { writeIPtoFile.WriteLine(textBox1.Text); }

Francis · Answer

You could consider to use the "regex" to validate the ip address. The below url provides some example on the regex: https://www.safaribooksonline.com/library/view/regular-expressions-cookbook/9780596802837/ch07s16.html Hope this helps!

How to make comparison of multiple values

Answers (5)