How to get an array of characters based on character sum with an anonymous LINQ method

Question

I want to get an array of characters as string values in from strings in listOfStrings that have a sum smaller than 50, but I don't know how to do that with LINQ.

I have written the code below as an illustration of what I'm rying to do:

IEnumerable<String[]> = from s in listOfStrings
                      where () => {
                          int sum = 0;
                          for (int i=0; i<s.Length(); i++)
                          {
                              sum += s[i];
                          }
                          return sum < 50;
                      }
                      select () =>
                      {
                          String[] t = new String[s.Length()];
                          for (int i=0; i<s.Length(); i++)
                          {
                              t[i] = s[i].toString();
                          }
                          return t;
                      }

Here listOfStrings is of type List<string[]>.

It would be hard to think of a more useless function; I'm just trying to find out how to execute stuff in lambda functions within LINQ, without making a new function to do it.

@tsukimi The function does not calculate the length, it calculates the sum of all characters — AStupidNoob
– AStupidNoob, Commented Jul 2, 2012 at 6:59
Do you want the integer value when you take s[i] or do you want the character value? — Tomas Jansson
– Tomas Jansson, Commented Jul 2, 2012 at 7:12

s.m. · Accepted Answer · 2012-07-02 06:47:23Z

2

If you use the method-chaining syntax instead of the query syntax (i.e. listOfStrings.Where(...)), you can stick the lambda in there.

answered Jul 2, 2012 at 6:47

s.m.

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1 Comment

AStupidNoob Over a year ago

OK, I'll look that up, but what's the basic difference?

McGarnagle · Accepted Answer · 2012-07-02 07:10:20Z

1

Using lambda functions is probably easier in this case...

var listOfStrings = new List<string>() { "foo", "bar" };
IEnumerable<string[]> result = 

    // restrict to strings where the sum of ASCII values is < 1000
    listOfStrings.Where(item => item.Sum(ch => (int)ch) < 1000)

    // select each as an array of strings
    .Select(item => item.Select(ch => ch.ToString()).ToArray());

// result:  { { "f", "o", "o" }, { "b", "a", "r" } }

edited Jul 2, 2012 at 7:10

answered Jul 2, 2012 at 6:45

McGarnagle

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Comments

Nikhil Agrawal · Accepted Answer · 2012-07-02 06:52:23Z

0

Perhaps:

listOfString.Where(s => s.Length < 50).ToArray();

edited Jul 2, 2012 at 6:52

Nikhil Agrawal

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answered Jul 2, 2012 at 6:50

Jocke

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Comments

TylerH · Accepted Answer · 2025-07-23 13:25:46Z

0

I think something like this might help you, I haven't compiled it so there might be some bugs in the code, but the concepts are there:

var result = listOfStrings.Where(y => y.Split().Aggregate(0, (y, x) => int.Parse(y)) < 50).Select(y => y.Split());

edited Jul 23 at 13:25

TylerH

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answered Jul 2, 2012 at 7:11

Tomas Jansson

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