C# Get random integer from list in each loop

Question

I'm new to C# and have the following piece of code:

int[] ids = { 190483, 184943, 192366, 202556, 169051, 177388, 170890, 146562, 189509 };

for (var i=0; i<50; i++)
{
    int randomID = *randomNumberFromIDList*;
    Console.WriteLine("Random ID:" + randomID);
}

As you can see, all I'm looking to do is with each loop assign and display a random ID from the list with the randomID being set as an int.

Is there a simple way to do this?

You'll need an instance of Random class, say it's named random. Then just call random.Next(ids.Count) and use it as an index. — Roman Kotenko
– Roman Kotenko, Commented Nov 13, 2015 at 11:23

a-ctor · Accepted Answer · 2015-11-13 11:24:01Z

3

Create a Random instance and call the Next(int, int) function to get number between inclusive lowest number and exclusive highest number:

int[] ids = { 190483, 184943, 192366, 202556, 169051, 177388, 170890, 146562, 189509 };

var random = new Random();
for (var i=0; i<50; i++)
{
    int randomID = ids[random.Next(0, ids.Length)];
    Console.WriteLine("Random ID:" + randomID);
}

answered Nov 13, 2015 at 11:24

a-ctor

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1 Comment

a-ctor Over a year ago

@GiorgiNakeuri As stated the second argument is the exclusive upper bound. Therefor Next(0, 1) will always generate 0. See msdn

Giorgi Nakeuri · Accepted Answer · 2015-11-13 11:34:37Z

1

You can use Random class for this and generate random number between 0 and length of an array:

var r = new Random();   
for (var i=0; i<50; i++)
    Console.WriteLine("Random ID:" + ids[r.Next(0, ids.Length)]);

edited Nov 13, 2015 at 11:34

answered Nov 13, 2015 at 11:24

Giorgi Nakeuri

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Comments

Bruno Joaquim · Accepted Answer · 2015-11-13 11:42:33Z

0

You could use a random to generate a index starting from 0 to the size of your array, with this index you acess a position of your array and get a random ID.

int[] ids = { 190483, 184943, 192366, 202556, 169051, 177388, 170890, 146562, 189509 };

var random = new Random();

for (var i = 0; i < 50; i++)
{
     int arrayPos = random.Next(0, ids.Count() - 1);
     int randomID = ids[arrayPos];
     Console.WriteLine("Random ID:" + randomID);
}

edited Nov 13, 2015 at 11:42

answered Nov 13, 2015 at 11:25

Bruno Joaquim

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