Finding the distinct values of a dictionary

Question

I have a GroupSummary class that has some properties like this in it:

public class GroupsSummary
{
    public bool FooMethod()
    {
      ////
    }
    public bool UsedRow { get; set; }

    public string GroupTin   { get; set; }
    public string PayToZip_4 { get; set; }
    public string PayToName  { get; set; }

    public string PayToStr1     { get; set; }
    public string PayToStr2     { get; set; }
    public string PayToCity     { get; set; }
    public string PayToState    { get; set; }
    public bool   UrgentCare_YN { get; set; }
}

Then I have a Dictionary like <string, List<GroupsSummary>

For each of these dictionary items I want to find all the distinct addresses but the properties of this class that define a distinct address for me are

PayToStr1,PayToStr2,PayToCity,PayToState

I know as far as I can say something like mydictionartItem.select(t => t).Distinct().ToList() but I think that will compare all the properties of this class which is wrong. So how should I solve this?

Answer 1

var newDict = dict.ToDictionary(
                    x=>x.Key, 
                    v=>v.Value.GroupBy(x=>new{x.PayToStr1, x.PayToStr2, x.PayToCity, x.PayToState})
                              .Select(x=>x.First())
                              .ToList());