Linq - Get last entry from different customers -

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i try create linq query unfortunately have no ideas resolve problem. highest entry of customers , form result 5 entries sort date.

id   date           id_costumer      1  - 01.01.2014  -   1      2  - 02.01.2014  -   2       3  - 02.01.2014  -   1      4  - 03.01.2014  -   1 --> value      5  - 04.01.2014  -   3      6  - 05.01.2014  -   3 --> value      7  - 05.01.2014  -   4        8  - 06.01.2014  -   4 --> value      9  - 08.01.2014  -   5 --> value      10 - 09.01.2014  -   6 --> value

i try query

  var query = g in context.geraete                g.online && g.altgeraet == false                select g;    query.groupby(g => g.id_anbieter).select(g => g.last());   query.take(5);

but doesn't work.

you should assign results of selecting last item group query variable:

 query = query.groupby(g => g.id_anbieter).select(g => g.last());  var result = query.take(5);

keep in mind - operator last() not supported linq entities. think should add ordering when selecting latest item each group, , selecting top 5 latest items:

 var query = g in context.geraete               g.online && !g.altgeraet              group g g.id_anbieter grp              select grp.orderbydescending(g => g.date).first();   var result = query.orderbydescending(x => x.date).take(5);

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