[英]how to get int by using Linq group by DATEPART month in C#
我有一个 StayDormApplications 表,我有一个 SQL,如下所示,
var systemFilesItem = _db.StayDormApplications.Single(r => r.Id == dormapplication.Id);
string SQL = "SELECT sum(days) days from StayDormApplications where poster = '" + LoginAccount + "' and DATEPART(MONTH, Sdate) = '"+ month_name + "' group by DATEPART(MONTH, Sdate);"; //
如何使用 (c#) LINQ 转换 SQL?
您可以尝试使用SqlFunctions.DatePart
来创建它,否则,您的查询似乎不需要使用group by
因为您根据条件对其进行了过滤。
var systemFilesItem = _db.StayDormApplications
.Where(x=> x.poster == LoginAccount && SqlFunctions.DatePart("MONTH", x.Sdate).Value == month_name)
.Sum(x=> x.days);
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