Hod do I make Order By in List <t> ?

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I have List<t> that has data :
June 19
May 5
January 3

All strings. How can I sort it like this :
January 3
May 5
June 19

because I will use it in a chart.

VB

'sorting
  Dim date_1 = date_name.GroupBy(Function(value) value).OrderBy(Function(t) t).Distinct().ToList()


  For Each date_name In date_1 
      chart_date.Series(0).Points.AddXY(date_name(0), date_name.Count)
  Next

it has error like this:

An unhandled exception of type 'System.ArgumentException' occurred in mscorlib.dll

Additional information: At least one object must implement IComparable.

Posted 3-Aug-15 15:49pm

NekoNao

Updated 3-Aug-15 16:08pm

Sergey Alexandrovich Kryukov

v2

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Sergey Alexandrovich Kryukov 3-Aug-15 22:03pm

Well, implement IComparable. What have you tried so far?
—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2015-08-03T16:07:00

Please see my comment to the question.

Here is a hint for you. Have a enumeration type defining months in exact spelling, such as enum Months = { Sunday, Monday, ...}. Parse each item into month and day, and recognize the enumeration value from month string using System.Enum.Parse. Then parse date. Implement the relationship of order for some type representing combination of month and day.

Alternatively, use System.DateTime.ParseExact or System.DateTime.TryParseExact and represent each line as the instance of System.DateTime.

—SA

Abhinav S · Answer 2 · 2015-08-03T16:10:00

Solution 2

My suggestion would be to convert them into datetime and then sort as necessary.

OrderBy in this case will sort on string.
If the property was datetime you would have got the right results.

Posted 3-Aug-15 16:10pm

Abhinav S