How do I combine groupBy and max? I want to group by name and get only the latest version. Something like this
Docs.GroupBy(x => x.Name ).Max(x => x.VersionNumber)
Is it possible?
the following
searchResult.Docs.GroupBy(x => x.PackageName).Select(x => x.Max(x => x.VersionNumber));
returns a
IEnumerable<int>
and not
IEnumerable<Doc>
Order each group by version number and select first doc only (it will have max version number):
Docs.GroupBy(x => x.Name)
.Select(g => g.OrderByDescending(x => x.VersionNumber).First())
Your code is not working, because you are selecting value of max version number (which is int) instead of selecting doc which has max version number.
您可以对其进行排序,并获得结果的第一个元素,例如:
searchResult.Docs.GroupBy(x => x.PackageName).OrderByDescending(x => x.Max(x => x.VersionNumber)).FirstOrDefault();
为了获取组的最新元素,查询是:
.GroupBy(x=>x.Name).Select(y=>y.OrderbyDescending(z=>z.Version).FirstorDefault());
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