如何从IQueryable.GroupBy中选择最新日期? [英] how to select the latest date from a IQueryable.GroupBy?

问题描述

我从此处

    var distinctAllEvaluationLicenses = allEvaluationLicenses.GroupBy((License => 
License.dateCreated)).Select(License => License.First());

如何选择最新的"dateCreated"而不是第一个"?

How can I select the latest 'dateCreated' instead of the First one?

推荐答案

如果您想要的只是最大值dateCreated，请尝试以下操作:

If all you want is the max dateCreated, try this:

var results = allEvaluationLicenses.Max(x => x.dateCreated);

如果要使用最大dateCreated的许可证，请尝试以下操作:

If you want the licenses with the max dateCreated, try this:

var results =
    allEvaluationLicenses.GroupBy(x => x.dateCreated)
                         .OrderByDescending(g => g.Key)
                         .First();

或使用查询语法:

var results =
    (from l in allEvaluationLicenses
     group l by l.dateCreated into g
     orderby g.Key descending
     select g)
    .First();

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