通过循环创建一个数组

Question

I need to create an array of strings, easy enough... the only problem is that the strings are integers from 1-1000 and I really dont want to type each of them.

Can you create a loop that could create this?

right now it looks like this

        private readonly string[] _myArray = { "1", "2", "3", "4", "5" };

and its called by

        for (var i = 0; i < _myArray.Length; i++)
        {
            arFoo[i].SetBar(_myArray[i]);
        }

any suggestions on how to add the other 995 without manually typing them?

Answer 1

This is simple and clean:

readonly string[] _myArray 
    = Enumerable.Range(1, 1000)
        .Select(i => i.ToString())
        .ToArray();

Answer 2

If you want to use LINQ:

    private readonly string[] _myArray;

    public Foo()
    {
        _myArray = Enumerable.Range(1, 1000).Select(s => s.ToString()).ToArray();
    }

Or more traditionally:

public class Foo
{
    private readonly string[] _myArray;

    public Foo()
    {
        _myArray = new string[1000];
        for(int i=1; i<=1000; i++)
        {
            _myArray[i - 1] = i.ToString();
        }
    }
}

Answer 3

_myArray = new string[1000];
for (int i = 1; i <= 1000; i++) _myArray[i - 1] = i.ToString();

Answer 4

string[] arr = new string[1000];
for (int i = 1; i <= 1000; i++)
{
    arr[i-1] = i.ToString();
}

Answer 5

How about

int NumberOfElements = 1000;
String[] Array = new String[NumberOfElements];

for(int i=0; i<Array.Length; i++)
{
   Array[i] = (i + 1).ToString();
}

Answer 6

Do you need an array? You could just do this:

for (var i = 0; i < 1000; i++)       
{            
   arFoo[i].SetBar(i.ToString()); 
}

If you do need an array, understand that arrays in C# (and in .Net) are fixed-size. You would need another data structure, like a List<String> in order to add elements, then you can transform to an array (if truly needed) via ToArray() .

Answer 7

var array = Enumerable.Range(1, 1000).Select(item => item.ToString()).ToArray();

Answer 8

int[] arr = Enumerable.Range(1, 1000).ToArray();

Answer 9

You can simply do it in a for loop as follows, calling ToString on the int 'i'

private string[] _myArray = new string[1000];

for(int i=0;i<1000;i++)
{
  _myArray[i] = i.ToString();
}

Answer 10

private readonly string[] _myArray = new string[1000];

for (int i = 0; i < _myArray.Length; i++)
    _myArray[i] = i.ToString();

Answer 11

This is method that will generate array of string from 'from' to 'to' inclusive.

private string[] GetNumbers(int from, int to)
{
  int size = to - from + 1;
  string[] result = new string[size];
  int number = from;
  for (int i = 0; i < size; i++)
  {
    result[i] = number.ToString();
    number++;
  }
  return result;
}

string[] numbers = GetNumbers(1, 1000); // to get what You want