Question

i wan to create a linked list that contains the name , age and address of some people , so far i created that code :

    LinkedList<string> details = new LinkedList<string>();

    details.AddFirst("Name1");
    details.AddLast("Name2");
    details.AddLast("Name3");

    foreach (var display in details)
    {
        Console.WriteLine(display);
    }

ok so now it works fine , but i just input the name , how can i input the age and address , is it like array ? i just don`t know much about linkedlists , and also i tried to delete some nodes of the linkedlist but i failed :

    foreach (var item in details)
    {
        if (item.Contains("Name3"))
        {
            details.Remove(item);
        }
    }

but i get that error :

Unhandled Exception: System.InvalidOperationException: Collection was modified after the enumerator was instantiated.

and finally , how can i edit a linkedlist item , like renaming Name2 to Name13 or anything , i would really appreciate any help , just give me idea and i`ll continue digging . Thanks in advance .

Answer 1

If you wish to add extra information within the list, simply create a class which encapsulates that information, as the LinkedList is a generic type. For example:

//Structure to hold extra information
public class PersonDetails
{
  public string Name {get; private set;}

  public int Age {get; private set;}

  public string Address {get; private set;}

  //Constructor
  public PersonDetails(string name, int age, string address)
  {
    this.Name = name;
    this.Age = age;
    this.Address = address;
  }
}   

Then you can create a new linked list containing those types:

LinkedList<PersonDetails> list = new LinkedList<PersonDetails>();
list.AddFirst(new PersonDetails("Name", 22, "Address"));

Note that you cannot modify a collection when you are enumerating it, you need to perform your check and modify it outside of your foreach loop.