Manipulating lists in C #

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Hello guys,

I have an idea where I still not sure how to solve in practice.

I have a list of string, these strings are all formed by 6 digits. "012345". what I want is to add these strings in a list.

Now with this list made, I want to go through the whole list and go picking at each position, the first digit of the string. in the end I want to form an array with all digits caught.

example: I have a list {012345, 032165, 211458, 214563, 098796, 574623, 894235, 3135698}

to scroll through the list to form the new vector like this: [0, 0, 2, 2, 0, 5, 8, 3] which is the first value of each element of the list.

first part I want to solve this problem.
second part I will randomly select a position that any vector in the main list and go and do the following: I want to build or a new list with only the file name starts with digit values drawn vector.

example: if the vector drawn the value "0", I want to build a new list with only those values: {012345, 032165, 098796}

any ideas? If I am not very clear on the idea, please tell me something

Posted 26-Aug-13 0:03am

fasher_the_one

Updated 26-Aug-13 0:12am

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ)

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Thomas Daniels · Accepted Answer · 2013-08-26T00:15:00

To solve the first problem, use this code:

C#

List<string> yourList = new List<string>() { "012345", "032165", "211458", "214563", "098796", "574623", "894235", "3135698"};
List<string> firstDigits = yourList.Select(x => x.Substring(0, 1)).ToList();

About the second problem, I'm not sure, but try this, and tell me if this isn't what you want:

C#

Random r = new Random();
int max = yourList.Select(x => x.Length).Min();
int randomNum = r.Next(9);
List<string> newList = yourList.Where(x => x.StartsWith(randomNum.ToString());

Hope this helps.

OriginalGriff · Accepted Answer · 2013-08-26T00:17:00

The first part is easy:

C#

List<string> myList = new List<string>() { "012345", "032165", "211458", "214563", "098796", "574623", "894235", "3135698" };
char[] chars = new char[myList.Count];
int index = 0;
foreach (string s in myList)
    {
    chars[index++] = s.Length > 0 ? s[0] : '?';
    }

The second part is also pretty simple - all you have to do is add a list, and a simple condition to the foreach loop.

But since this sounds like homework, I'll leave that to you!

Manipulating lists in C #

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