How do I store an array of strings into another array of strings?

Question

I'm trying to store my old array of struct type that holds first names of people into a new string array that has been downsized so I can then shuffle it round in another method.

string[] newStringArray = new string[10]

for (int i = 0; i < oldStringArray.Length; i++)
{    
    newStringArray = oldStringArray[i].firstName;//Cannot convert type 'string to 'string[]'
}

foreach (string value in newStringArray)
{
    Console.WriteLine(value);
}

Answer 1

It looks like you forgot the index accessor:

string[] newStringArray = new string[10];
for (int i = 0; i < oldStringArray.Length && i < newStringArray.Length; i++)
{
    newStringArray[i] = oldStringArray[i].firstName;
    //             ^
}

Answer 2

You can project your FirstName properties using Enumerable.Select, and then materialize them into a new array using Enumerable.ToArray:

string[] firstNames = oldStringArray.Select(x => x.FirstName).ToArray();

Answer 3

If you want only the first ten firstnames then use

var firstTenFirstNames = oldStringArray.Select(x => x.FirstName).Take(10).ToArray()

Answer 4

You have to declare the new array with the same size as the old one.

string[] newStringArray = new string[oldStringArray.Length];

Then use the indexer to set the elements of the new array.

for (int i = 0; i < oldStringArray.Length; i++)
{    
    newStringArray[i] = oldStringArray[i].firstName;
}