How to filter datatable using linq

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I have a datatable .Now I want to filter that datatable using linq .datatable have many column but like

station   max_temp  min_temp   date
XYZ       14.5       3.5        26-5-2016
XYX       13.5       3.5        25-5-2016
ABC       14.5       3.5        26-5-2016
ABC       12.5       5.5       23.5.2016

Now I want to select in datatable like this

XYZ     14.5       3.5        26-5-2016
ABC     14.5       3.6       26.5.2016

What I have tried:

C#

DataView dv = new DataView(dtExtraRowOfXML);
            dv.Sort = "DateTime DESC";

            var x = (from r in dtExtraRowOfXML.AsEnumerable() select r["Station"]).Distinct();


            DataTable dtfinalXML = dt1.AsEnumerable().Union(dtExtraRowOfXML.AsEnumerable(), DataRowComparer.Default).CopyToDataTable();

Posted 26-May-16 20:02pm

kumari567

Updated 27-May-16 1:03am

Maciej Los

v4

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OriginalGriff 27-May-16 2:09am

And?
What did it do that you didn't expect, or not do that you did?
Remember that we can't see your screen, access your HDD, or read your mind - and we can't run your code because we don't have your data!
Use the "Improve question" widget to edit your question and provide better information.

kumari567 27-May-16 2:20am

I dont know how to improve but as I make you understand that I have a datatable in which many column in which i have to apply filteration so uniqe station name and latest datewise....that is all

Philippe Mori 27-May-16 9:25am

Then why you don't say that in your question? You only show us an example and your example is a bad one since you have same date 3 times, your date formatting is not consistant and one station name seems to be misspelled.

You should make far more effort to write correct question if you ever want useful answer.

kumari567 31-May-16 7:53am

sure sir ....I will try.

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Richard Deeming · Answer 1 · 2016-05-27T00:44:00

Solution 1

Something like this should work:

C#

DataTable dtfinalXML = dt1.AsEnumerable()
    .GroupBy(r => r.Field<string>("station"), (key, rows) => rows.OrderByDescending(r => r.Field<DateTime>("date")).First())
    .CopyToDataTable();

Posted 27-May-16 0:44am

Richard Deeming