add to array from a loop C#

Question

How can I add to an array which is in a foreach loop.

pseudo example

String[] mylist;
foreach ( ipadress ip in list )
{
 // I want to add to array ip.ToString();
}
// then put my list to a textbox

Answer 1

If you are using linq try this instead :

String[] mylist = list.Select(I => Convert.ToString(I.ip)).ToArray();

Answer 2

First of all, if this is a homework problem, it should really be tagged as such.

Anyway, assuming you have complete control of the string[] you are passing values to, and assuming your ipaddress class has .ToString() overloaded to give you back some intelligent information:

string[] myList = new string[list.Count];
int i = 0;
foreach (IPAddress ip in list)
{
 myList[i++] = ip.ToString();
}

Although I have to question why you are going back and forth between arrays and list objects to begin with.

• Spreadzz: i am figureing out cod to show my local ip address. I posted it down. Although inside the foreach i made an if (ip.AddressFamily.ToString() == "InterNetwork") that wil show me the ip, i realised that beeing new to c# don't know how to add array`s from loop. So i did that just for learning.
• Spreadzz: And don't laugh at "ip.AdressFamily.ToString()" :)) i did not knew to do this the hard way, and did not want to research
• Samuel Edwin Ward: The homework tag is now officially deprecated.
• MadHenchbot: Oops. Thanks for the heads up. :)
• MadHenchbot: @Ramhound - Have you tried compiling it? The assumption is that 'ipaddress' is a fully fleshed-out class, and that 'list' is a List<ipaddress> object. It compiles just fine on my machine.

Answer 3

Quick and short:

 String[] myList;
 List<int> intList = new List<int> { 1, 2, 3, 4 };
 myList = intList.ConvertAll<String>(p => p.ToString()).ToArray<String>();

Answer 4

Figured it out...new to programming.., thanks to all. I used same code that tharindlaksh posted.

this is how it looks:

string[] all ;
int i = 0;
foreach (IPAddres ip in host.AddressList)
{
 all[i] = ip.ToString();
 i++;
}
textBoxMain.Text = all[0] + "\n" + all[1] + \n" + all[2] + "\n" + all[3];

• Security Hound: This code will not compile. The correct class name is IPAddress. Its not clear the reason you are converting the contents of AddressList to a string.
• MadHenchbot: Don't forget to initialize your string[]! You'll want to set its length to (at least) match the length of the data you are passing in, or you risk getting out of bound exceptions.

Answer 5

int i=0;
String[] mylist;
foreach(ipaddress ip in list)
{
mylist[i]=ip.ToString();
i++
}

• Austin Salonen: Code that compiles is possible here.
• Spreadzz: Thank you this is what i was looking for! I figured it out by myself tho.. I tought that if i give an int i =0; out the loop and a i++ in the loop, at each loop it wil give i the value 0 .... New to c# :D
• tharindlaksh: I just wrote this.. i imageine that the class is not Predefined one.. The idea was that.. Sorry if this code is not working..
• MadHenchbot: It wasn't clear from the question, but it turns out there is a predefined IPAddress class in System.Net. @Ramhound - Posting "This won't compile" and downvoting everything without explaining why it won't compile is not helpful to anyone.
• tharindlaksh: That's right mate.. We are begginers of this field.. thank you for comment.. :D