LINQ orderby on date field in descending order

Question

How can I change the LINQ query in the code below to sort by date in descending order (latest first, earliest last)?

using System;
using System.Linq;
using S         


        

Answer 1

I don't believe that Distinct() is guaranteed to maintain the order of the set.

Try pulling out an anonymous type first and distinct/sort on that before you convert to string:

var ud = env.Select(d => new 
                         {
                             d.ReportDate.Year,
                             d.ReportDate.Month,
                             FormattedDate = d.ReportDate.ToString("yyyy-MMM")
                         })
            .Distinct()
            .OrderByDescending(d => d.Year)
            .ThenByDescending(d => d.Month)
            .Select(d => d.FormattedDate);

Answer 2

I was trying to also sort by a DateTime field descending and this seems to do the trick:

var ud = (from d in env 
     orderby -d.ReportDate.Ticks                 
     select  d.ReportDate.ToString("yyyy-MMM") ).Distinct(); 

Answer 3

env.OrderByDescending(x => x.ReportDate)

Answer 4

This statement will definitely help you:

env = env.OrderByDescending(c => c.ReportDate).ToList();