an array question

Question

i have an array below

string stringArray = new stringArray[12];

stringArray[0] = "0,1";
stringArray[1] = "1,3";
stringArray[2] = "1,4";
stringArray[3] = "2,1";
stringArray[4] = "2,4";
stringArray[5] = "3,7";
stringArray[6] = "4,3";
stringArray[7] = "4,2";
stringArray[8] = "4,8";
stringArray[9] = "5,5";
stringArray[10] = "5,6";
stringArray[11] = "6,2";

i need to transform like below

List<List<string>> listStringArray = new List<List<string>>();

listStringArray[["1"],["3","4"],["1","4"],["7"],["3","2","8"],["5","6"],["2"]];

how is that possible?

Im not following what you want this transformation to do ... how does the input relate to the output? — Sam Saffron
– Sam Saffron, Commented May 26, 2009 at 15:44
I'm pretty sure that he wants the output to be grouped together by the first number in the input strings (i.e. "1, 3" and "1, 4" get put into the same bucket.) — mqp
– mqp, Commented May 26, 2009 at 15:46
Ahh, so there is a typo in the input data it should start with "1,1" — Sam Saffron
– Sam Saffron, Commented May 26, 2009 at 15:51

mqp · Accepted Answer · 2009-05-26 15:45:48Z

10

I think what you actually want is probably this:

var indexGroups = x.Select(s => s.Split(',')).GroupBy(s => s[0], s => s[1]);

This will return the elements as a grouped enumeration.

To return a list of lists, which is what you literally asked for, then try:

var lists = x.Select(s => s.Split(',')).GroupBy(s => s[0], s => s[1])
             .Select(g => g.ToList()).ToList();

edited May 26, 2009 at 15:45

answered May 26, 2009 at 15:40

mqp

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scottheckel · Accepted Answer · 2009-05-26 15:39:32Z

0

There's no shorthand like that. You'll have to break into a loop and split each array and add to the list.

answered May 26, 2009 at 15:39

scottheckel

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1 Comment

jrista Over a year ago

Enter the great and powerful LINQ! :P

Sam Saffron · Accepted Answer · 2009-05-26 16:04:17Z

0

Non LINQ version (I must admit its much uglier, but you may have no choice)

        var index = new Dictionary<string, List<string>>();
        foreach (var str in stringArray) {
            string[] split = str.Split(',');
            List<string> items;
            if (!index.TryGetValue(split[0], out items)) {
                items = new List<string>();
                index[split[0]] = items;
            }
            items.Add(split[1]); 
        }

        var transformed = new List<List<string>>();
        foreach (List<string> list in index.Values) {
            transformed.Add(list); 
        }

edited May 26, 2009 at 16:04

answered May 26, 2009 at 15:41

Sam Saffron

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