如何在返回的数组列表中获取第一个索引的值

I am using C# windows form

我正在使用C＃窗体

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?

我有一个来自类中函数的数组列表，我将函数调用为函数返回数组列表的形式，如何获取数组的值？

Here is my List of array code

这是我的数组代码列表

    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

当我调用该函数时，我想将所有名字显示在列表框中，并将姓氏显示在另一个列表框中

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

4 个解决方案

#1

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

使用lambda表达式遍历列表并选择第一个名称

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

#2

Without a lambda expression:

没有lambda表达式：

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

#3

This should do the job:

这应该做的工作：

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

#4

I think will be better to use SelectMany.

我认为使用SelectMany会更好。

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

AddRange

的AddRange

SelectMany

的SelectMany

EDIT:

编辑：

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

对不起，我是瞎子，你可以不用选择很多 - 你可以使用Select

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

#1