Linq query to get the distinct values in a list

Question

Suppose this is my member class

class Member 
{
    public string CategoryId { get; set; }
    public string MemberName { get; set; }
    public int Distance { g         


        

Answer 1

This should cover your needs:

var grouped = list.GroupBy(item => item.CategoryId);
var shortest = grouped.Select(grp => grp.OrderBy(item => item.Distance).First());

It first groups the items with the same CategoryId, then selects the first from each group (ordered by Distance).

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Update: You could chain all of these together too, if you prefer:

var shortest = list.GroupBy(item => item.CategoryId)
                   .Select(grp => grp.OrderBy(item => item.Distance)
                   .First());