Remove duplicate items from string and count occurrence of each item

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I have a string

C#

string chars = "A|A|B|A+|C|B+|A+|C|A|B+|B";

from above string I would like to remove duplicate items and count occurrence of each unique item.

Result should be like >> A: 3; A+: 2; B: 2; B+: 2; C: 2

I would like to achieve above in C#.

Thanks in advance.

Posted 17-Nov-13 2:43am

sam7one

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Thomas Daniels · Accepted Answer · 2013-11-17T02:50:00

Solution 1

Try this:

C#

string chars = "A|A|B|A+|C|B+|A+|C|A|B+|B";
string output = string.Join("; ", chars.Split('|')
    .GroupBy(x => x)
    .OrderBy(x => x.Key)
    .Select(x => string.Format("{0}: {1}", x.Key, x.Count())));
Console.WriteLine(output);

Output: A: 3; A+: 2; B: 2; B+: 2; C: 2

Posted 17-Nov-13 2:50am

Thomas Daniels

Comments

sam7one 17-Nov-13 9:39am

Thanks for prompt reply, both the answers serve my purpose...

Thomas Daniels 17-Nov-13 9:39am

You're welcome!

OriginalGriff 17-Nov-13 9:54am

Hah! Snap! :laugh:

OriginalGriff · Accepted Answer · 2013-11-17T02:51:00

Solution 2

Linq methods make it pretty simple:

C#

string chars = "A|A|B|A+|C|B+|A+|C|A|B+|B";
string[] sep = chars.Split('|');
List<string> withCount = sep.GroupBy(s => s).Select(g => g.Key+ " : " + g.Count()).ToList();
foreach (string s in withCount)
    {
    Console.WriteLine(s);
    }

Posted 17-Nov-13 2:51am

OriginalGriff

Comments

sam7one 17-Nov-13 9:39am

Thanks for prompt reply, both the answers serve my purpose...

OriginalGriff 17-Nov-13 9:54am

You're welcome!

Thomas Daniels 17-Nov-13 10:25am

I voted 4, because, first of all, you used string concatenation, and it's better to use string.Format, and second, because it is not necessary to convert the results to a list. Foreach also works on an IEnumerable<T>