如何将SQL查询转换为LINQ与Orderby, Groupby

本文关键字：LINQ Orderby Groupby 转换 SQL 查询 | 更新日期: 2023-09-27 18:11:23

我正在写这个SQL查询在linq，但没有工作…

select [ProcessTime], Count([ID]) as 'amount of processes'
from [DB].[dbo].[TableX]
where [ID] in ('ServerX', 'ServerY') and [Type] ='Complete'
group by [ProcessTime]
order by [ProcessTime]

我想实现这个链接&我所尝试的是，我将查询分为两个，一个用于进程时间分组子句，另一个用于计数ID的

。
var query1 =  (from a in this.db.Processes
               where (a.ID =='ServerX' || a.ID =='ServerY') && a.Type =='Complete'
               group a by a.ProcessTime into b
              //here I dont know where to place orderby
               select b);

 var query2 = (from a in this.db.Processes
               where (a.ID =='ServerX' || a.ID =='ServerY') && a.Type =='Complete'
               orderby a.ProcessTime 
               select a).Count();

这是将查询拆分为两个然后再将它们合并的正确方法吗?

如何将SQL查询转换为LINQ与Orderby, Groupby

试试这个:

var serverNames = new string[]{"ServerX", "ServerY"};
var result = db.Processes
    .Where(p => serverNames.Contains(p.ID) && p.Type == "Complete")
    .GroupBy(p => p.ProcessTime)
    .Select(g => new
    {
        ProcessTime = g.Key,
        AmountOfProcesses = g.Count()
    })
    .OrderBy(x => x.ProcessTime);

您可以在一个查询中完成所有这些:

var query1 = (from a in this.db.Processes
              where (a.ID == "ServerX" || a.ID == "ServerY") && a.Type == "Complete"
              group a by a.ProcessTime into b
              orderby b.Key
              select new {ProcessTime = b.Key, Count = b.Count()});
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