How to put a number of order in front of strings in a list?

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Hi.
I want to put the number of order in front of strings in a list. For example:
my list is: "aaa","bbb","ccc" and now I want it to look like this: "1.aaa", "2.bbb", "3.ccc". This is how I managed to do this but I'm wondering is there a better way to do this in C#(I believe it is):

C#

for(int i = 0;i < number;i++)
{
        stringInList[i] = (i + 1) + ". " + stringInList[i];   
}

This is a bit primitive way of solving my problem.

EDIT:
Also, I want to check if there are already numbers in front of strings so that I don't get this: "1.1.aaa","2.2.bbb","3.3.ccc".

Posted 5-Dec-15 22:35pm

PeMaCN

Updated 6-Dec-15 3:08am

v4

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Manas_Kumar · Accepted Answer · 2015-12-05T22:55:00

Solution 1

Try with below code using lambda:

C#

List<string> tempList = new List<string>() { "bbb", "aaa", "ccc" };

tempList = tempList.OrderBy(rec => rec).Select((item, index) => (index + 1).ToString() + "." + item).ToList();

Output
1.aaa
2.bbb
3.ccc

Posted 5-Dec-15 22:55pm

Manas_Kumar

Updated 5-Dec-15 23:26pm

v3

Comments

PeMaCN 6-Dec-15 5:22am

And how can I check if list is already ordered?

[no name] 6-Dec-15 5:27am

I have updated my answer - check it again.

PeMaCN 6-Dec-15 7:28am

It works but can you explain me what did you do, please? Sorry for waiting.

[no name] 6-Dec-15 7:43am

I used lambda expression to accomplish your requirement. Let me describe it:

tempList is the variable which contains all strings in wrong alphabetical order. So it is doing order by using OrderBy(rec => rec). Now our list is alphabetical ordered and it is fetching item and its index using Select((item, index). Then it is appending the index value(with increment by 1), hard code string "." and the item. By combining all it gives you result like: "1.aaa"

PeMaCN 6-Dec-15 8:27am

And how do you check if it already has numbers in front of strings

BillWoodruff 6-Dec-15 8:34am

I suggest you edit your original post to include this information. If it is a requirement for you to validate the string entries first, you should tell us that.

PeMaCN 6-Dec-15 8:44am

It is updated now