How to generate a list of number in C#

Question

How to create a list of num from 1 to 10 Example:

int[] values = Enumerable.Range(1,max).ToArray();
MessageBox.Show(values+",");

The output should be: 1,2,3,4,5,6,7,8,9,10 Please help

Kamil Budziewski · Accepted Answer · 2015-09-13T14:55:27.507

6

your code is generating array of integers from 1 to 10

int[] values = Enumerable.Range(1,10).ToArray();

but you're displaying them in wrong way (you're trying to cast int array to string), change it to

MessageBox.Show(string.Join(",", values);

string.Join will join your values separating them with ,

In .Net <4.0 you should use (and I believe OP is using one)

MessageBox.Show(string.Join(",", values.Select(x=>x.ToString()).ToArray());

edited Sep 13 '15 at 14:55

answered Sep 13 '15 at 14:37

Kamil Budziewski

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It return an error Error 2 Argument '2': cannot convert from 'int[]' to 'string[]' Please help I'm new to C# – ZeroX Sep 13 '15 at 14:40
@ZeroX sorry, changed answer, I forgot to cast int to string – Kamil Budziewski Sep 13 '15 at 14:41
Still return an error Error 2 Argument '2': cannot convert from 'System.Collections.Generic.IEnumerable' to 'string[]' – ZeroX Sep 13 '15 at 14:44
@GrantWinney Yeah, but why isn't? I checked and string.Join accepts IEnumerable – Kamil Budziewski Sep 13 '15 at 14:48
@ZeroX you should be using .Net at least 4.0 – Kamil Budziewski Sep 13 '15 at 14:54
@ZeroX I Changed my answer to target previous versions of .Net – Kamil Budziewski Sep 13 '15 at 14:55
@ZeroX glad to help :) – Kamil Budziewski Sep 13 '15 at 15:02

score 0 · Answer 2 · edited Sep 14 '15 at 03:01

0

List<int> values = Enumerable.Range(1, 10).ToList();
MessageBox.Show(string.Join(",", values.Select(x => x.ToString())));

edited Sep 14 '15 at 03:01

Sender

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answered Sep 13 '15 at 14:46

Arash

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Rahul · Answer 3 · 2015-09-13T15:00:02.630

0

Try like below using the generic version of Join<T>() method.

        int[] arr = Enumerable.Range(1, 10).ToArray();
        MessageBox.Show(string.Join<int>(",", arr));

Generate 1,2,3,4,5,6,7,8,9,10

(OR) using good old foreach loop

        string str = string.Empty;
        foreach (int i in arr)
        {
            str += i.ToString() + ",";
        }
        MessageBox.Show(str.TrimEnd(','));

edited Sep 13 '15 at 15:00

answered Sep 13 '15 at 14:47

Rahul

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Error 1 The non-generic method 'string.Join(string, string[])' cannot be used with type arguments Still getting error – ZeroX Sep 13 '15 at 14:52
There is something wrong at your end. Which framework version you are on? This works fine for me. – Rahul Sep 13 '15 at 14:53
I'm using microsoft visual C# 2008 :3 – ZeroX Sep 13 '15 at 14:54
@ZeroX, Not sure but may be you are using framework version 3 or lower probably. – Rahul Sep 13 '15 at 14:55
@ZeroX, see edit in answer with the normal looping approach. – Rahul Sep 13 '15 at 15:00

How to generate a list of number in C#

3 Answers3