选择计数LINQ [英] Selecting count in LINQ

问题描述

我得到列的SQL Server表 ResolvedDate 和 ResolvedBy 。

现在我要选择那些两列和计算它们的结果，我想我会实现这样的：

  _dataContext.Activities
    。凡（A =＆GT; a.IsResolved和放大器;＆安培; a.ResolvedBy ==用户id）
    。选择（A =＆gt;新建{a.ResolvedDate，*** COUNT ***}）;
 

正如你所看到的，计数部分缺失。

我想每一个活动，即在这ResolvedDate已经完成又算什么呢。

我怎么能实现呢？

解决方案

 从在dataContext.Activities
其中，a.IsResolved和放大器;＆安培; a.ResolvedBy ==用户id
一组由a.ResolvedDate为G
选择新{ResolvedOn = g.Key，NumberResolved = g.Count（）}
 

I got a SQL Server table with columns ResolvedDate and ResolvedBy.

Now I want to select those two columns and count their results, which I thought I'd implement like that:

_dataContext.Activities
    .Where(a => a.IsResolved && a.ResolvedBy == userId)
    .Select(a => new { a.ResolvedDate, ***COUNT*** });

As you can see, the Count-Part is missing.

I want to get every activity, that has been done in this ResolvedDate and count it.

How can I implement that?

解决方案

from a in dataContext.Activities
where a.IsResolved && a.ResolvedBy == userId
group a by a.ResolvedDate into g
select new {ResolvedOn=g.Key, NumberResolved= g.Count()}

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