Sort by month in linq and EF

Question

I have a linq query and inside of it is the month name. I want the results sorted by the month (Jan, Feb, Mar, ...).

Currently I have the below but it\'s giving me and e

Answer 1

The best way and easiest way is create a stored procedure

Create procedure sortevents
   as
 SELECT *
        FROM [SAGMJ].[dbo].[Events]
        ORDER BY CASE 
                 WHEN MONTH([StartAt]) = MONTH(GETDATE())
                    AND YEAR([StartAt])  = YEAR(GETDATE()) THEN 0
                   ELSE 1
                 END, [StartAt];

//Next call your sp

var v = (dc.sortevents()).ToList();

Answer 2

Something like this should work

var shockValues = ctx.Shocks.Where(s => s.ID == id).Select(x => new {x.MonthName, MonthNum = x.MonthName == "Jan" : 1 ? x.MonthName == "Feb" : 2 ? 0}).OrderBy(s => MonthNum).Select(s => new {val = s.MonthName + "=" + s.ShockValue}     

Answer 3

If you dont want to create a table in your database, you can do like

var names = DateTimeFormatInfo.CurrentInfo.MonthNames
            .Take(12).Select(s => new[] {s.Substring(0,3)});

And then order against a separate list.

orderby names.IndexOf(s.MonthName)

Answer 4

Try:

orderby Convert.ToDateTime(s.MonthName + " 1, " + DateTime.Now.Year.ToString()).Month

Answer 5

You've got few options. You could use a long list of optional operators to map the names to numbers

order by s.MonthName == "Jan" ? 1 : s.MonthName == "Feb" ? 2 : ...

You could create a table in your DB that maps the names to nummeric values

var shockValues = (from s in ctx.Shocks
                   join o in MonthOrder on s.MonthName equals o.MonthName
                   where s.ID == id
                   orderby o.MonthNumber
                   select new 
                   {
                       val = s.MonthName + "=" + s.ShockValue
                   });

Or do the ordering in memory

var shockValues = (from s in ctx.Shocks
                   where s.ID == id
                   select new
                          {
                              s.MonthName,
                              s.ShockValue
                          })
                  .AsEnumerable()
                  .OrderBy(s => DateTime.ParseExact(s.MonthName, "MMM", CultureInfo.InvariantCulture).Month)
                  .Select(s => new 
                               {
                                   val = s.MonthName + "=" + s.ShockValue
                               });