LINQ aggregate items in a list, concatenate a property

Question

Please be kind to a LINQ dummy... Say I have 8 rows data like this:

+-------------------+
|  ID   WORKTYPEDESC|
+-------------------+
| 1     plumber     |
| 1           


        

Answer 1

Just group by Id, use string.Join to aggregate within each group.

IEnumerable<Worktype> source = ...;
var query = source.GroupBy(
    x => x.Id,
    (id, g) => new Worktype
    {
        Id = id,
        WorktypeDesc = string.Join(";", g.Select(x => x.WorktypeDesc).OrderBy(x => x))
    });