Question

here is the problem:
I have a column with the topics in the format: “boston | new york | chicago”. The names can be different and number of the topics can vary in the records.
What I need to come up with is the collection of the same names with the count of those names.

This is what I have done:

 var splitted = queryResult.Select(x => x.TopicData);
 List<string> lstOfTopics = new List<string>();
 foreach (var element in splitted)
 {
   string[] splitedTopics = element.Split('|');
   lstOfTopics.AddRange(splitedTopics);
 }
var groupedTopics = lstOfTopics.GroupBy(x => x).Select(group => new {key = group.Key, count = group.Count()}).AsEnumerable();

seems a lot of code for a simple task. any ideas how to simplify this?

thanks!

Answer 1

You can construct the list using SelectMany and ToList:

List<string> lstOfTopics = splitted.SelectMany(x => x.Split('|')).ToList();

You can also omit the construction of the list entirely:

var groupedTopics = queryResult
    .SelectMany(x => x.TopicData.Split('|'))
    .GroupBy(x => x)
    .Select(group => new { group.Key, Count = group.Count()});