How to make comparison of multiple values

Rohit Nair

10y882.NET

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 !

5 Replies

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Francis Susaimichael10y ago
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 Nair10y ago
@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 Menoth10y ago

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 Jhavar10y ago
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! \n\nError: " + 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 Susaimichael10y ago
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!