CODEWITHSUNDEEP
c#arrayslist
user3809979
user3809979

Reputation: 3

How do i get the value of first index in a returned List of array

I am using C# windows form

I have a List of arrays from a function in a class and I called the function into the form the function returned a List of arrays, how do i get the value of the arrays?

Here is my List of array code

    public List<string[]> getAccounts()
    {
        List<string[]> account = new List<string[]>();

        while (*condition*)
        {
            string[] users = new string[2];
            users[0] = user["firstname"].ToString();
            users[1] = user["lastname"].ToString();
            account.Add(users);
        }
        return account;
    }

and when i call the function I want to show all the firstname into a listbox as well as the last name into another listbox

        for (int i = 1; i <= acc.getAccounts().Count; i++)
        {
            listBoxFirstname.Items.Add(*all the first name from the list*);
        }

Upvotes: 0

Views: 85

Answers (4)

Baximilian
Baximilian

Reputation: 885

I think will be better to use SelectMany.

listBoxFirstname.Items.AddRange(acc.getAccounts().SelectMany(item=>item[0]))

AddRange

SelectMany

EDIT:

Sorry, i'm blind, you can do it without Select many - you can just use Select

listBoxFirstname.Items.AddRange(acc.getAccounts().Select(item=>item[0]))

Upvotes: 0

Manish Basantani
Manish Basantani

Reputation: 17499

This should do the job:

List<string> firstNames = account.Select(item => item[0]).ToList();

Upvotes: 0

Heslacher
Heslacher

Reputation: 2167

Without a lambda expression:

List<string[]> accounts = acc.getAccounts()
for (int i = 1; i < accounts ; i++)
{
    listBoxFirstname.Items.Add(account[i][0]);
    listBoxLastname.Items.Add(account[i][1]);
}

Upvotes: 1

Michael B
Michael B

Reputation: 581

Use a lambda expression to iterate through the list and select the first name

account.ForEach(s => listBoxFirstname.Items.Add(s[0]));

Upvotes: 7

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